LEGO Harry Potter: Years 1-4

LEGO Harry Potter: Years 1-4 is a video game based on the first four installments of the Harry Potter series in LEGO form. The game was released on 25 June, 2010. It was developed by Traveller's Tales, which have also made several other LEGO games, and published by Warner Bros. Interactive Entertainment.

A special Collector's Edition version of the game will be released containing a Behind the scenes look at the game, a free set of avatar clothes, if the game is for Xbox 360, an exclusive set of House crest magnets, and an interview on the making of Deathly Hallows.

Gameplay
The game is based on the first four books and films of the Harry Potter series: Philospher's Stone, Chamber of Secrets, Prisoner of Azkaban and Goblet of Fire. The main playable characters are Harry, Ron and Hermione. The game features a total of 167 characters who can be unlocked by finding the special tokens hidden around the Hogwarts secret places and level missions, and then buying them at Madam Malkin's. The sub-missions include seeking for Red Bricks, the Golden Bricks, the mentioned Character Tokens, saving Hogwarts students and the True Wizard achievements. Harry and his friends will learn in the Hogwarts castle how to use spells, charms, jinxes, and preparing potions, as well they will visit a lot of familiar places like Hogwarts Castle, Diagon Alley, the Forbidden Forest or Hogsmeade.

Harry Potter and the Philosopher's Stone

 * Albus Dumbledore does not use the Deluminator to put all the lights out on Privet Drive.
 * The cat at Privet Drive is not the Animagus form of Minerva McGonagall but just a normal black cat.
 * When Hagrid arrives at Privet Drive he crashes the flying motorcycle into the flower beds.
 * For comic-relief Harry has his glasses on when he is a baby.
 * Dudley's birthday is skipped, and Piers Polkiss is absent.
 * The letters from Hogwarts come from more places in the Dursley home, such as the toaster, the washing machine, and in between the windshield-wipers of their car while driving to the Hut-on-the-Rock.
 * In the book and movie Vernon tries to shoot Hagrid with a Double Barrel Shotgun, but in the game Hagrid simply scares the Dursleys by barging through the back, scaring them and causing them to break. Also, Hagrid does not give Dudley a pigs-tail, or give Harry a birthday cake.
 * The goblin that Hagrid showed Harry's keys to, appeared to have been taking notes. But when the goblin goes to fetch Griphook, Hagrid caught a glimpse of the paper, revealing it to simply have been a child's drawing of a house.
 * When Hagrid gets Harry's key, he pulls several other things out of his pocket.
 * At the Leaky Cauldron, the customers aren't in shock when they see Harry.
 * In the game Griphook opens Vault 712 which had goblins discoing to the Harry Potter theme.
 * Hermione doesn't meet Harry and Ron on the Hogwart's Express; they met each other on Platform 9¾. Also, Ron tries fixing Harry's glasses with Reparo, but fails and turns a wizard's hat into a frog.
 * Hermione hangs around with Harry and Ron instead of staying away from them before the troll incident.
 * Pansy Parkinson is absent.
 * Lee Jordan does not have dreadlocks.
 * The sorting hat indicates the house the wearer is in by making the house shield on the wall move and make the house mascot sound instead of call the house name out. This was done because LEGO characters can't talk but mumble instead.
 * The Halloween Feast sequence happens before, not after the Flying Lesson sequence in the game.
 * In the book and film, Hermione hides in the bathroom because Ron made fun of her. In the game, she cries because Malfoy threw a brownie at her face before dinner.
 * It takes much longer for Ron and Hermione to catch Snape's clothes on fire. Also, Quirrell is seen jinxing the broom at the same time.
 * Harry doesn't catch the Snitch in his mouth. Instead, it's dislodged from his ear.
 * In the movie Ron, Harry and Hermione are scared of Fluffy. In the game Ron pulls out a Trumpet and plays "Hedwig's Theme" (although very badly).
 * Ron searches with Harry in the Restricted Section.
 * Snape and Quirrell do not have a confrontation during Harry's search in the Restricted Section.
 * Marcus Flint is the Slytherin Quidditch team's seeker.
 * In the book and film, Ron sees himself in the Mirror of Erised as head boy, Quidditch captain, and winner of the Quidditch Cup. In the game, he sees himself in a Quidditch uniform, and Hermione appears to kiss him on the cheek.
 * During the last trip to the Mirror of Erised, Harry and Ron are caught by Dumbledore, who simply walks in and points to his wrist and they go back to bed sadly. In the book, Harry and Ron go back because they heard a sound in the distance. Also, only Harry is caught during his last trip but Dumbledore talks to him for a while before sending him back to bed, though he said he was there when Ron came along.
 * The Norbert part is only available in a time-turner mission where Hagrid needs help in heating Norbert's egg.
 * There are some differences in the unicorn part:
 * 1) There's a sick unicorn at Hagrid's Hut. Malfoy unintentionally scares the unicorn, and it runs off into the Forbidden Forest.
 * 2) Hagrid treats his sick unicorn like a child, cradling it in a blanket, taking its temperature, and making it lay in bed.
 * 3) Harry, Ron, Hermione, Hagrid, Fang and Malfoy go into the forbidden forest to find the unicorn.
 * 4) Voldemort simply creeps up on the unicorn, and attempts to eat it, using a fork and knife, but never killed it.
 * 5) Voldemort attempts to kill the unicorn after Firenze scares him.
 * 6) Bane and Ronan are absent.
 * 7) Firenze does not mention about unicorn blood.
 * 8) Neville was not in the unicorn part.
 * 9) Harry gives a signal to his friends.
 * Snape doesn't get bitten by Fluffy.
 * Harry, Ron & Hermione see Quirrell walking up the stairs to the forbidden corridor, and they are seen by Quirrell when they enter Fluffy's room. In the film and book they don't know who wants to steal the Stone until the last room, though they believe it to be Snape.
 * The Trio tricks Fluffy with a rubber duck toy, in order to distract him so that they can fix the broken Harp.
 * Quirrell and Snape's rooms to guard the Philosopher's Stone do not appear.
 * Ron doesn't fall unconscious during the chess-game. Instead, he falls over the chess sword while following Harry & Hermione to the last room.
 * Harry and Hermione have to fight Voldemort/Quirrell, instead of just Harry. This was probably changed to make it more co-op friendly. In the movie, Hermione goes and gets Dumbledore.
 * Quirrell morphs into Voldemort rather than taking the turban off to reveal Voldemort's face.
 * When Harry touches Voldemort in the face, his parents applaud for him in the Mirror of Erised. When Harry is knocked unconscious by Voldemort, Harry's parents laugh at Voldemort, because he can't pick up the Stone because he is only a ghost.
 * In the book and film, Quirrell dies from touching Harry. In the game, Harry fights Quirrell, he pulls Quirrell's arms off and Quirrell survives, but is seen in the Hospital wing heavily bandaged..
 * The Philosopher's Stone does not get destroyed.
 * The House Cup is omitted.

Harry Potter and the Chamber of Secrets

 * The Dursleys have a sign in their room which is supposed to mean: "No wands used in this house!" or "No magic in this house!".
 * The Dursleys are not wearing formal clothing during their meeting with the Masons.
 * When Harry enters his room at Privet Drive, Dobby is throwing his books in the bin because he doesn't want Harry to go back to Hogwarts.
 * When Mrs. Mason is hit by the pudding, Dudley starts to eat the pudding from off her head.
 * The Dursleys install a security fence in their backyard, in addition to the bars on Harry's window.
 * Fred and George do not come to rescue Harry, instead it is just Ron, but in the novel and movie they do.
 * When Harry and Ron crash into the barrier, Dobby shows up at the side. In the book and film, it is not revealed to anybody until Harry is injured by the rogue Bludger.
 * The garden gnomes are featured in the Burrow's garden, unlike the film.
 * Molly Weasley does not send a howler to Ron for stealing the car.
 * Ron's broken wand is only shown to malfunction twice, during an optional scene in Hagrid's garden where Ron spits up slugs, and when Lockhart attempts to use it to erase Harry and Ron's memories. Although Ron does indicate his wand is malfunctioning during the Whomping Willow scene he does not actually perform any spells.
 * When Ron puts a slug vomiting charm on himself, he did it because Malfoy called Hermione a Mudblood. In the game, Malfoy threw an apple at Hermione.
 * Lavender Brown is absent, but she will be featured in the sequel.
 * Gilderoy Lockhart's wand does not get thrown out the window or taken away during the DADA class that he sets Pixies free. Also, Immobulus first immobilizes the pixies, then a second shot kills them.
 * During the Quidditch match, Hermione notices Dobby cursing the Bludger. In the book and movie, Harry finds out after he is in the Hospital wing.
 * Drinking Skele-Gro heals Harry's arm instantly. In the book and film Harry had to stay overnight in the Hospital Wing while he recovered.
 * In the novel and in the movie, Harry can't interact with anything while he is inside Tom Riddle's diary (because it's like a vision). However, Harry can interact with some things (like potions) to advance through the level. Tom Riddle can't see it in the cutscene, but he's Harry's partner in the rest of the level. This was probably done to make it more co-op friendly.
 * The Polyjuice Potion does not take a month to brew, although this is deliberately done to save time.
 * Ron and Harry do not facially transform into Crabbe and Goyle, respectively. They merely wear their robes and hairstyles like a hat.
 * Hermone does not notice that she is turned into Millicent Bulstrode's cat until Harry and Ron point it out. Because of this she does not hide in the bathroom embarrassed.
 * Armando Dippet is absent.
 * In the novel and the film, after the Flying Ford Anglia saved Harry and Ron from Aragog, they have to get in. But in the game, the Flying Ford Anglia includes a light-blue flying scooter that Harry rides to escape from Aragog and get out of the Forbidden Forest with Ron in the car. They did this to make it more co-op friendly.
 * Aragog chases Ron and Harry along with his children, but in the book and the film it is just Aragog's family who chases them.
 * Hermione's note about the Chamber of Secrets is just a picture of a basilisk and a pipe.
 * When Gilderoy loses his memory, he builds a chair of some rocks and drinks a cup of tea.
 * Harry and Ginny fight Salazar Slytherin's basilisk together, because Ginny is awake and playable in the Chamber of Secrets, instead of unconscious and being drained of her life force, as in the movie and the book, Ginny wakes up only after Harry defeats the Basilisk alone. This is done to make it more co-op friendly. When the fight starts the Basilisk goes after Harry not Ginny because Riddle needs to drain her life force to become alive again.
 * In the beginning cutscene of the Basilisk where Tom Riddle starts laughing evilly for amusement, his face begins to flicker into Voldemort in the videogame, though in the movie, he stops his evil laugh short and becomes angry at the sight of Fawkes
 * Salazar Slytherin's basilisk has a scarlet plume on his head (meaning it is a male, instead of female as in the novel).
 * The basilisk notices Harry when Ginny screams at one of his disembodied eyes.
 * Harry's arm is not pierced by the basilisk fang, instead he takes it out of the dead basilisk's mouth.
 * While Harry is doing the above, Ginny discovers when the diary suffers any kind of hard knock, the memory of Tom Riddle does as well. As such she uses the diary to injure Tom Riddle in a comical way to keep him from attacking Harry and Ginny, until Harry snatches the diary from Ginny's hands and stabs the diary with the aforementioned Basilisk fang.
 * In the book and film, Tom Riddle tries to stop Harry from stabbing the diary. But in the game, Riddle explodes immediately.
 * After the battle, Harry asks Dumbledore for the diary. Taking it out to Lucius Malfoy, he gives it to Dobby when he shows the gesture to open it. But instead of sending Malfoy across the room, Dobby simply removes his pants.
 * In the book, Hermione enchants the cupcakes to make Crabbe and Goyle fall alseep, as well as make them float to the top of a railing. In the game, Ron enchants them and Harry makes them float to Crabbe and Goyle instead of putting them on a railing. Also, Harry and Ron dragged Crabbe and Goyle into a nearby broom closet after they fall asleep. In the game, however, they walk into what seems to be an entire room by themselves.
 * In the book, Harry and Ron go into the Slytherin Common Room to see if Draco is the heir of Slytherin. In the game, they go in the common room to find out if Draco has the same symbol on his broomstick that Hermione has in her notes.

Harry Potter and the Prisoner of Azkaban

 * Bill Weasley and Charlie Weasley are absent, probably because the Weasley family's trip to Egypt is ommited. Later, they are both featured in the sequel.
 * Ripper the bulldog is absent
 * Aunt Marge starts to mention Harry's parents after she finds a picture of them.
 * In the book and film, the black dog appears in front of Harry out from behind the bushes. But in the game, he is seen on a playground roundabout.
 * Stan Shunpike does not appear as the Knight Bus conductor, but he is a playable character.
 * When the Knight Bus passes between two London Buses it does not squeeze itself as well as everything in it like in the film. Instead it rebuilds itself, arranging the bricks so it is taller and thinner.
 * The Knight Bus doesn't stop to let an elder lady cross the street.
 * Cornelius Fudge does not talk to Harry when he arrives at the Leaky Cauldron.
 * For co-op purposes, Arthur Weasley fights the Monster Book of Monsters with Harry.
 * Buckbeak does not appear to break Malfoy's arm, since he is able to use it to point at Hagrid without effort.
 * In the book and film, Malfoy calls Buckbeak, "a great ugly brute." But in the game, Malfoy provokes Buckbeak by throwing a chicken leg at him. Also, Buckbeak advances on Malfoy and snaps at him but doesn't physically attack him. Malfoy falls to the ground while trying to back away but does not appear to be harmed.
 * Unlike the film, Harry is seen going through the passage to Honeydukes. Also, Fred and George acompany him through the passage.
 * In the book, the passage to Honeydukes is described as being a long narrow tunnel. In the game, however, it is quite spacious and has various plants growing.
 * Kellah and Bem are absent.
 * The Security Trolls are featured unlike the film.
 * Harry does not have to wear his Invisibility Cloak unlike in the book or the film; Malfoy does not run to tell on Harry, unlike the events in the book, likely because that would cause confusion for younger audiences.
 * In the film, Harry throws snowballs from under the Invisibility Cloak at Draco for calling Hermione a mudblood. In the game Draco makes an igloo and uses it like a tank to shoot snowballs back.
 * When Harry and Hermione are trying to warn Hagrid and the trio that Dumbledore, Fudge, and Macnair are coming, they throw more than just a pebble. They also throw a spoon and other objects.
 * When Hagrid peaks out of the window, Harry is seen dressed as a scarecrow.
 * When Harry tries to get Buckbeak to follow him, he pushes him. In the film, Hermione uses a dead ferret to lure Buckbeak, but in the game, Hermione uses a chicken leg instead.
 * Peter Pettigrew is exposed when Lupin and Sirirus lure Scabbers into a mousetrap with cheese instead of using the Animagus Reversal Spell.
 * When Harry and Hermione lure Lupin to them, they play a werewolf howl on record recorder, and Lupin walks over and falls in love with Hermione instead of trying to attack her, although, as in the film, he quickly turns hostile when he sees that she is not a werewolf as well.
 * When Harry casts Expecto Patronum on dementors, they instantly vanish, instead of being repelled away like in the book and film (although in the cutscenes they are simply repelled).
 * In the film, Harry defeats all of the dementors at one time, but he has to defeat them individually in the game.
 * Harry and Hermione only ride Buckbeak up to a tower near where Sirius was being held, not the full way there.
 * In the final boss battle, Dementors have to be fought. In the film, Harry and Hermione just save Sirius without a battle.
 * Lord Voldemort's boggart isn't his own dead body, but it's Harry alive and well. This boggart is shared with all Death Eater characters. Similarly, with the exception of Harry, Ron, Hermione, Neville Longbottom, Dean Thomas, Parvati and Padma Patil, and Lupin, everyone else's boggart is Voldemort returned to power. (ironically the boggart Harry had originally pictured before remembering the Dementors)
 * Both of Sirius Black's break-ins of Hogwarts are absent.
 * Most of the time, all of the character's Patronus' do not take the form of an animal.

Harry Potter and the Goblet of Fire

 * Frank Bryce is absent, and is replaced by a milkman.
 * The Quidditch World Cup match between Ireland and Bulgaria is skipped. Instead it starts out with the Death Eaters' attack on the camp.
 * For some reason, despite the first level being named "The Quidditch World Cup", the level heavily focuses more on the Death Eater Attack and the Dark Mark.
 * Barty Crouch Sr and Amos Diggory's hair colour is gray, however, in the films they are black.
 * Viktor Krum's hair has a flat top, but in the film his hair is shaved off.
 * Nigel Wolpert is absent.
 * Ludovic Bagman is absent.
 * Igor Karkaroff's aide is absent.
 * Harry's argument with Ron is omitted.
 * Charlie Weasley seems to be omitted but it is possible that the Dragon keeper who appears represents Charlie.
 * Harry does not use his Invisibility Cloak to get a sneak peek at the dragons.
 * In the First Task Harry and Hermione fall into the arena, so they are both running from the dragon. It chases Harry and Hermione inside the Hogwarts Castle as well, but this is only done to make it more co-op friendly.
 * The Golden Egg is floating over fire.
 * Unlike the film the Nifflers and Blast-Ended Skrewts are included (though the Skrewts appear only in the DS version.
 * The Pensieve scene where Harry finds out about Barty Crouch Jr. is omitted.
 * The death of Barty Crouch, Sr. is omitted.
 * The Yule Ball has been omitted, but certain characters can be purchased in their formal wear.
 * The Cho Chang meeting in the Owlery is also absent, though she can be unlocked there.
 * Cedric Diggory teams up with Harry during the second and third tasks, but this is only a feature to make it more co-op friendly.
 * When Harry takes a bath he wears underwear while in the book and movie he is completely naked, this is done to make the game more family-friendly.
 * In the Third task there is a giant living sphinx statue and the riddle of the acromantula written on a wall of the labyrinth as well as an acromantula itself. The sphinx and the acromantula part is not featured in the film, but they are in the book.
 * Harry and Cedric fight Voldemort together so this is yet another feature to make it more co-op friendly.
 * Cedric Diggory does get killed by Voldemort, as he was hit by the curse the very moment he grabbed the portkey, reappearing at the tournament disassembled. However, Dumbledore shows Amos Diggory instructions on how to re-build his son, so Cedric does not actually die in the game.
 * Voldemort is also sucking on a pacifier before Pettigrew drops him into the cauldron's potion
 * Peter Pettigrew uses Harry's glasses instead of his blood to revive Voldemort. This is probably to make it more kid friendly. Also when Voldemort comes out he is shown with Harry's glasses, and then tosses them back to Harry.
 * Nott is absent, but Crabbe and Goyle are featured in the portable versions.
 * Lord Voldemort allows his Death Eaters to attack Harry although in the book and film he orders them to stand down because he wanted to be the one to kill Harry.
 * Only Lily and James Potter emerge from Voldemort's wand during the Priori Incantatem sequence, however this is because Cedric had not yet been killed and Frank Bryce was not included in the game. However, following the canonical nature of Priori Incantatem, the milkman who took Frank's place should have also emerged.
 * The real Moody wears ordinary clothes instead of a white jumpsuit. He also appears to be happy as he waved happily at Dumbledore and Harry when they opened the trunk.
 * The Imperius Curse is omitted.

The Magic Begins

 * Playable characters: Harry (Blue Shirt), Hagrid, Griphook
 * Main locations: Leaky Cauldron, Diagon Alley; Gringotts Wizarding Bank

Out of the Dungeon

 * Playable characters: Harry, Ron
 * Boss: Quirrel's Mountain Troll (with 3 hearts)
 * Main locations: Unknown corridor in the Hogwarts Castle, Second-floor girls' lavatory

A Jinxed Broom

 * Playable characters: Ron, Hermione
 * Main locations: Stands of the Hogwarts Quidditch pitch

The Restricted Section

 * Playable characters: Ron, Harry
 * Main locations: Restricted Section

The Forbidden Forest

 * Playable characters: Ron, Hermione, Hagrid, Fang
 * Main locations: Forbidden Forest

The Face of the Enemy

 * Playable characters: Harry, Ron, Hermione
 * Boss: Voldemort/Quirrel (with 3 hearts)
 * Main locations: Philosopher's Stone Chambers

Floo Powder

 * Playable characters: Harry, Ron, Ginny, Hagrid
 * Main locations: The Burrow; Borgin and Burkes; Knockturn Alley

Dobby's Plan

 * Playable characters: Hagrid, Ron, Hermione, Madam Pomfrey
 * Boss: Dobby (with 5 hearts)
 * Main locations: Stands of the Hogwarts Quidditch pitch, Hospital wing

Crabbe and Goyle

 * Playable characters: Harry, Ron
 * Main locations: Second-floor girls' lavatory, Slytherin Dungeon

Tom Riddle's Diary

 * Playable characters: Harry, Ron, Tom Riddle (as a teenager)
 * Boss: Moaning Myrtle (with 4 hearts)
 * Main locations: Second-floor girls' lavatory, Tom Riddle's Diary

Follow the Spiders

 * Playable characters: Harry, Ron, Fang
 * Boss: Aragog (with 3 hearts)
 * Vehicles: Flying Ford Anglia, Flying light-blue scooter
 * Main Locations: Forbidden Forest

The Basilisk

 * Playable characters: Harry, Ron, Gilderoy Lockhart, Ginny
 * Boss: Salazar Slytherin's basilisk (with 5 hearts)
 * Main locations: Second-floor girls' lavatory; Chamber of Secrets

News from Azkaban

 * Playable characters: Harry, Ron, Hermione, Arthur Weasley, Professor Lupin
 * Boss: The Monster Book of Monsters (with 3 hearts)
 * Main locations: Leaky Cauldron; King's Cross Station; Hogwarts Express

Hogsmeade

 * Playable characters: Harry, Ron, Hermione, Fred, George Weasley
 * Boss: Draco Malfoy (with 4 hearts and in the igloo tank, with 3 hearts)
 * Main locations: One-Eyed Witch Passage, Honeydukes, Hogsmeade

Mischief Managed

 * Playable characters: Harry, Ron
 * Main locations: Hogwarts Castle corridors

The Shrieking Shack

 * Playable characters: Harry, Hermione, Lupin, Sirius
 * Boss: Whomping Willow (with 3 hearts), Dementors trying to kiss Sirius in a cutscene
 * Main locations: The Whomping Willow; Tunnel to Shrieking Shack; Shrieking Shack; Forbidden Forest

Dementor's Kiss

 * Playable characters: Harry, Hermione
 * Boss: 6 Dementors
 * Main locations: Forbidden Forest, Black Lake
 * Object: Harry wakes up in the hospital wing, Harry & Hermione must find & outwit Werewolf-Lupin & then, they have to find the dementors, The dementors will fly around, circling Harry & Sirius, Harry & Hermione must unlock the rock that is caught by Devil's Snare, Then, 6 dementors will fly away from Harry & spread out on the lake, Harry & Hermione must then conjure a Patronus 6 times to destroy all of the dementors, A cutscene will show dementors finally managing to Kiss Harry. Harry conjures a Patronus driving the dementors away from him.

The Dark Tower

 * Playable characters: Harry, Hermione
 * Boss: Dementor's Leader (with 3 hearts)
 * Main locations: Dark Tower
 * Object: Harry & Hermione ride Buckbeak & see Fudge & Macnair locking up Sirius, Harry & Hermione ride Buckbeak, but fall off from the untimely arrival of dementors. Harry & Hermione must make their way to the top of the tower before the dementors kiss Sirius, Upon reaching the top, The leader will commence a battle, They have to beat the leader before they can save Sirius, (Hint: Best ways to end the battle quickly, Open the barrels & put a plunger over the leader's mouth, try avoiding the dementors that fly in or they'll kiss Harry or Hermione if given enough times of gaps in defense.)

The Quidditch World Cup

 * Playable characters: Ron, Hermione, Ginny, Fred, George, Arthur Weasley
 * Boss(es): Death Eaters/Snakes
 * Main locations: 1994 Quidditch World Cup campsite

Dragons

 * Playable characters: Harry, Hagrid, Fang
 * Main locations: Dragon-holding area in Forbidden Forest

The First Task

 * Playable characters: Harry, Hermione
 * Boss: Hungarian Horntail
 * Main locations: Quidditch Arena, Hogwarts Castle

The Secret of the Egg

 * Playable characters: Harry, Moaning Myrtle
 * Main locations:Second-floor girls' lavatory, Prefects' bathroom

The Black Lake

 * Playable characters: Harry, Cedric
 * Main locations: Black Lake quays, Black Lake

The Dark Lord Returns

 * Playable characters: Harry, Cedric
 * Main locations: Hedge Maze; Little Hangleton graveyard
 * Boss: Voldemort (with 3 hearts)

List of characters
The main characters (Harry, Ron and Hermione) are controlled since the start of the game but some of them can be found in the missions and hidden places. Afterwards they can be unlocked when the player buys them in Madam Malkin's in Diagon Alley. Some characters can be bought with different clothes. The majority of characters featured can be controlled however giant creatures like the troll, the Salazar Slytherin's basilisk or the Hungarian Horntail cannot be playable as well as the Dementors or Firenze. The * indicates the character is playable.

The trio

 * Harry Potter* (Available in Blue Shirt, Sweater (only on consoles and Windows versions), Hogwarts uniform, Quidditch uniform, Dragon Task uniform (only on consoles and Windows versions), Yule Ball tuxedo (Only on consoles and Windows versions), Lake Task uniform, Maze Task uniform, Pyjamas (only on consoles and Windows versions), Girl disguise, and with Slytherin disguise as a Polyjuice Potion Gregory Goyle (only on consoles and Windows versions). He can use the Cloak of Invisibility.
 * Hermione Granger* (Available in Red Hooded Top, Blue Top (only on consoles and Windows versions), Grey Hooded Top (only on consoles and Windows versions), Yule Ball dress (only on consoles and Windows versions), Hogwarts uniform and as a Polyjuice Potion Millicent Bulstrode's cat (only on consoles and Windows versions). She can control Crookshanks in the years 3 and 4 episodes.


 * Ron Weasley* (Available in Brown Jacket (only on consoles and Windows versions), Pyjamas (only on consoles and Windows versions), Sweater, Hogwarts uniform, Yule Ball tuxedo (only on consoles and Windows versions), Girl disguise (only on consoles and Windows versions), and with Slytherin disguise as polyjuice potion Vincent Crabbe (only on consoles and Windows versions). He can control Scabbers in the years 1, 2 and 3 episodes. It is clear that Scabbers is not playable in Year 4 because the previous year he was revealed to be the man Peter Pettigrew, the second Marauder.

Professors

 * Alastor Moody*
 * Albus Dumbledore* (Available with purple robes or grey robes and you can unlock Fawkes)
 * Aurora Sinistra*
 * Filius Flitwick*
 * Gilderoy Lockhart* (Available with Green Jacket and his normal robes)Lego_Hagrid.png, as depicted in the game]]
 * Minerva McGonagall* (can transform into her animagus cat form)
 * Pomona Sprout* (ability to dig, not affected by Mandrakes)
 * Quirinus Quirrell* (Available in Voldemort form)
 * Remus Lupin* (can transform into his werewolf form)
 * Rolanda Hooch*
 * Rubeus Hagrid*
 * Septima Vector*
 * Severus Snape*
 * Sybill Trelawney*

Other staff

 * Argus Filch* (can control Mrs. Norris)
 * Irma Pince*
 * Poppy Pomfrey*
 * Sorting Hat

Students

 * Gryffindor house
 * Alicia Spinnet*
 * Angelina Johnson*
 * Colin Creevey*
 * Dean Thomas*
 * Fred Weasley* (Available with Sweater, Hogwarts uniform, and Quidditch uniform (Only on Consoles and Windows versions))
 * George Weasley* (Available with Sweater, Hogwarts uniform and Quidditch uniform (Only on Consoles and Windows versions))
 * Ginny Weasley* (Available with Hooded Top, Cardigan (Only on Consoles and Windows versions), and Hogwarts uniform)
 * Gryffindor boy*
 * Gryffindor girl*
 * Katie Bell*
 * Lee Jordan*
 * Neville Longbottom* (Available with Hogwarts uniform or Pyjamas; can control Trevor the toad)
 * Oliver Wood*
 * Parvati Patil* (Available with Hogwarts uniform and Yule Ball dress (Only on Consoles and Windows versions)
 * Percy Weasley* (Available with Sweater or prefect clothes)
 * Seamus Finnigan*


 * Hufflepuff house
 * Cedric Diggory* (Available in sweater (only on consoles and Windows versions), Hogwarts Uniform, Dragon Task uniform (only on consoles and Windows versions), Lake Task uniform and Maze Task uniform)
 * Ernie Macmillan*
 * Hannah Abbott*
 * Hufflepuff boy*
 * Hufflepuff girl*
 * Hufflepuff prefect*
 * Justin Finch-Fletchley*
 * Susan Bones*


 * Ravenclaw house
 * Anthony Goldstein* (Playable only in the DS and PSP versions)
 * Cho Chang*
 * Michael Corner* (Playable only in the DS and PSP versions)
 * Moaning Myrtle* (Available in Hogwarts and swimsuit (only on consoles and Windows versions))
 * Padma Patil* (Available in Hogwarts uniform and Yule Ball dress)
 * Penelope Clearwater*
 * Ravenclaw boy*
 * Ravenclaw girl*
 * Ravenclaw prefect*


 * Slytherin house
 * Draco Malfoy* (Available with Sweater, Quidditch uniform, and Hogwarts uniform)
 * Gregory Goyle* (Available with Sweater and Hogwarts uniform)
 * Marcus Flint*
 * Millicent Bulstrode*
 * Slytherin boy*
 * Slytherin girl*
 * Slytherin prefect*
 * Tom Riddle* (16 Year old Hogwarts student)
 * Vincent Crabbe* (Available with Sweater and Hogwarts uniform)

Order of the Phoenix

 * Arthur Weasley*
 * Molly Weasley*
 * Sirius Black* (can transform into his animagus dog form)

Lord Voldemort, his Death Eaters and followers

 * Lord Voldemort/Tom Riddle* (Available in Quirrell version, 16 year old Hogwarts student and final form)
 * Bartemius Crouch Jr.*
 * Crabbe Sr.* (Playable only in the DS, PSP, and iOS versions)
 * Death Eater*
 * Goyle Sr.* (Playable only in the DS, iOS, and PSP versions)
 * Lucius Malfoy*
 * Peter Pettigrew* (can transform into his animagus rat form, Scabbers)
 * Walden Macnair*

Ministry of Magic

 * Amos Diggory*
 * Arthur Weasley*
 * Bartemius Crouch Sr.*
 * Cornelius Fudge*

Diagon Alley and Leaky Cauldron

 * Doris Crockford*
 * Madam Malkin*
 * Mr. Ollivander*
 * Tom, the Innkeeper*

Hogsmeade

 * Madam Rosmerta*
 * Shrunken Heads

Knight Bus

 * Ernie Prang*
 * Stanley Shunpike*

Hogwarts Express

 * Trolley Witch*

The Weird Sisters

 * Donaghan Tremlett the Bassist*
 * Kirley Duke the Guitarist*
 * Myron Wagtail the Vocalist*
 * Orsino Thruston the Drummer*

Other staff

 * Boy*
 * Dragon keeper*
 * Girl*
 * Rita Skeeter* (can transform into her beetle animagus form)
 * Shifty wizard*
 * Witch* (Available in white and grey)
 * Wizard* (Available in red, white and green)

Beauxbatons

 * Beauxbatons student
 * Fleur Delacour* (Available in Beauxbatons uniform, Dragon Task uniform, Lake Task uniform (only on consoles and Windows versions), and Maze Task uniform (Only on Consoles and Windows versions))
 * Gabrielle Delacour*
 * Olympe Maxime* (Playable only in the DS and PSP versions)

Durmstrang

 * Durmstrang student*
 * Igor Karkaroff*
 * Viktor Krum* (Available in Durmstrang uniform, First Task uniform, Shark form, Third Task uniform)

Ghosts

 * Bloody Baron*
 * Fat Friar*
 * James Potter*
 * Lily Evans*
 * Moaning Myrtle* (Available in Hogwarts uniform and swimsuit (only on consoles and Windows versions))
 * Nearly Headless Nick*
 * Peeves (Only appeared in the portable versions)
 * Professor Binns*
 * The Grey Lady*

Muggles

 * Dudley Dursley*
 * Marjorie Dursley* (Playable only in the DS and PSP versions)
 * Milkman*
 * Mr. Mason*
 * Mrs. Mason*
 * Petunia Dursley*
 * Station guard*
 * Vernon Dursley*

Creatures

 * Acromantula (As an enemy)
 * Aragog (As a boss for year 2)
 * Boggart (As an enemy. It turns into a dementor, McGonagall giving a bad grade, a spider, Snape, a moon, Voldemort, a snake, Harry Potter, and an eye.)
 * Bowtruckle (They help building wooden ladders in the Forbidden Forest)
 * Buckbeak* (Only playable in some missions)
 * Chinese Fireball
 * Common Welsh Green
 * Cornish Pixie (As an enemy)
 * Crookshanks* (Only playable with Hermione in years 3 and 4)
 * Dementor (As enemies and a final boss)
 * Dobby*
 * Fang*
 * Fawkes
 * Firenze
 * Gargoyle
 * Giant Squid (Its tentacles are seen during the Second Task and in the Chamber of Secrets)
 * Gnome
 * Goblin
 * Grindylow (As an enemy in the Second Task)
 * Griphook*
 * Hedwig (She sends red bricks to Diagon Alley)
 * Hungarian Horntail
 * Mandrake (Can be taken by a wizard with earhelders to crash crystals)
 * Merpeople (As enemies in the Second Task)
 * Mosp (As enemies in the Forbidden Forest levels (Year 1,2 and 3)
 * Mountain Troll (As a boss)
 * Mrs. Norris* (Only playable with Argus Filch)
 * Niffler (As creatures living in burrows)
 * Norbert
 * Plimpy
 * Scabbers* (Only playable with Ron Weasley until the fourth year starts and can be transformed from Pettigrew's animagus ability)
 * Security troll (They protect some Hogwarts entrances during the third year. They can use expansive waves when someone throws a spell to them)
 * Salazar Slytherin's basilisk (As a final boss)
 * Sphinx (As a statue in the Third Task)
 * Swedish Short-Snout
 * Trevor* (Only playable with Neville Longbottom)
 * Werewolf* (Only available with Remus Lupin's transformation ability)
 * Whomping Willow (As a boss)

Classrooms

 * Care of Magical Creatures
 * Charms Classroom. There are two classrooms: one for the Wingardium Leviosa spell lesson and another for the Lumos spell lesson.
 * Defence Against the Dark Arts Classroom. There are two classrooms: one for the Immobulus and Riddikulus spells, and another for the Patronus and Reducto spell lessons.
 * Divination Classroom
 * Flying Courtyard
 * Herbology Classroom
 * Potions Classroom
 * Transfiguration Classroom which also contains a practice room.

Common rooms

 * Gryffindor Tower
 * Hufflepuff Basement
 * Ravenclaw Tower
 * Slytherin Dungeon

Other places

 * Chamber of Secrets
 * Clock Tower and Clock Tower Courtyard
 * Grand Staircase
 * Great Hall
 * Headmaster's office
 * Library and Restricted Section
 * Hospital wing
 * Middle Courtyard
 * Mirror of Erised storage room
 * Muggle Studies Classroom
 * One-Eyed Witch Passage
 * Owlery
 * Prefects' bathroom
 * Second-floor girls' lavatory
 * Third Floor Corridor

Hogwarts Grounds

 * Covered Bridge
 * Greenhouses
 * Hagrid's cabin
 * Black Lake
 * Quidditch pitch
 * Stone Circle

Hogsmeade

 * Hogsmeade Station
 * Honeydukes
 * Shrieking Shack
 * The Three Broomsticks

Other magical places

 * Diagon Alley
 * Eeylops Owl Emporium
 * Flourish and Blotts
 * Gringotts
 * Madam Malkin's Robes for All Occasions
 * Ollivanders Wand Shop
 * Wiseacre's Wizarding Equipment
 * "Fun" spells that can be purchased here:


 * Slugulus Eructo
 * Multicorfors
 * Rictusempra
 * Entomorphis
 * Tarantallegra
 * Locomotor Mortis
 * Redactum Skullus
 * Colovaria
 * Calvorio
 * Anteoculatia
 * Herbifors
 * Glacius
 * Incarcerous
 * Flipendo
 * Trip Jinx
 * Stupefy
 * Engorgio Skullus
 * Accio


 * Leaky Cauldron
 * Knockturn Alley
 * Borgin and Burkes
 * Mr. Roberts's campsite
 * Platform 9 and 3/4
 * The Burrow

Muggle places

 * Godric's Hollow
 * Hut-on-the-Rock
 * King's Cross Station
 * Little Whinging
 * Privet Drive
 * London

Taught spells

 * Aresto Momento (DS/PSP version only)
 * Expelliarmus
 * Immobulus (Consoles and Windows versions only)
 * Incendio (DS/PSP version only)
 * Lumos Solem
 * Reparo (DS/PSP version only)
 * Expecto Patronum
 * Reducto
 * Riddikulus
 * Transfiguration spell
 * Wingardium Leviosa

Dark spells

 * Avada Kedavra
 * Crucio

List of Potions

 * Ageing Potion
 * Exploding Potion
 * Invisibility Potion
 * Polyjuice Potion
 * Strength Potion
 * Skele-Gro

Errors

 * Remus can be transformed into a Werewolf without a full moon as if it were an animagus ability.
 * Hermione can translate ancient runes in the first year even though she does not start ancient runes until her third year. However these could be extremely easy runes that every student in first year learn.
 * Adult Mandrake cries are supposed to be fatal to anyone who hears them, young mandrake cries only knock people out. Yet when someone gets close to them, they just get annoyed, not even knocked out. However they were holding their hands over their ears and it is possible that this also works.
 * During the end credits, in the "Music By" section, it spells "Azkaban" as "Azkiban."
 * Several Gryffindor's can be seen sitting at the other Hogwarts House's Tables. However it is possible that those students were talking with the others and that the staff did not mind it.
 * Seamus Finnigan's boggart was a banshee in the book but Voldemort in the game. Molly Weasley's boggart was a dead version of someone she was close to in the book but Voldemort in the game. In the books, Voldemort's boggart is his own dead body, but in the game it is Harry Potter. Also, many Death Eaters' boggarts are Voldemort, including Lucius Malfoy's. However it is possible, in the case of Death Eaters, that, although they were loyal to Voldemort, they still feared him.
 * In Diagon Alley, Mr. Mulpepper's Apothecary is misspelled "Mr. Mullpepper's Apothecary." However this could be a writing error of his own.
 * Polyjuice Potion is not meant for non-human transformations but in the game you can turn into Fang, Griphook, Dobby and Rubeus Hagrid (he is Half-giant) without any problems.
 * Grown-ups cannot enter their old common rooms. Gilderoy Lockhart can't enter the Ravenclaw Tower, Lucius Malfoy can't enter the Slytherin Dungeon, etc.

Remaining three years
LEGO Harry Potter: Years 5-7 is confirmed to be released in November 2011.