LEGO Harry Potter: Years 1-4 - Sony PSP Explore iconic settings from Diagon Alley, the Forbidden Forrest, Hogsmead and, of course, Hogwarts castle. Hogwarts castle is a grand, immersive 3D environment and the largest, most detailed LEGO game location every built. Play as Harry Potter, Ron Weasley, Hermione Granger as well as other favorite characters; over 100 playable characters. Attend lessons, cast spells, mix potions, fly on the broomsticks and complete tasks to earn house points.