LEGO Harry Potter: Years 1-4 (PS3)

Lego Harry Potter: Years 1–4 is a video game in the Lego video game franchise, developed by Traveller's Tales and published by Warner Bros. The game is based on the Lego Harry Potter line and its storyline will cover the first four films of the Harry Potter series: Philosopher's Stone (Sorcerer's Stone in the U.S.), Chamber of Secrets, Prisoner of Azkaban and Goblet of Fire. Lego Harry Potter's gameplay is similar to that of most previous Lego games, with an emphasis on collecting and exploring. Casting spells is an integral part of the gameplay, with a wide range of spells available for unlocking as the player progresses. As there are many spells available in the game, you use the spell wheel to select your spell. Potion-making is another integral feature; potions can help the player complete levels or, if created incorrectly, have adverse side effects such as turning the player into a frog.
Changes to the mechanics of previous games include 'Student In Peril' missions, which are a group of challenges to help a student, Polyjuice Potion, which allows players to temporarily change one of your characters into any other mini-figure unlocked. A major change is to the hub system. On most versions, Diagon Alley works as a hub for unlockable extras, while Hogwarts acts as a constantly evolving massive hub with the unlockable characters found by picking up their hidden portraits.
The bigger areas in Hogwarts have led developer Traveller's Tales to improve the overall level design. If you are lost in-game you can follow a trail of Ghost Studs. These do not count towards your stud total, but will guide you to the next section of the level.