Unlock Arkham
To unlock Arkham (psychiatric hospital for the criminally insane) you must achieve 'True Villain' status on ALL levels in the Villain storyline by collecting enough studs to max out your stud counter on each level. To access the villains and the level go to the right of the Batcomputer and down the ramp and pull the lever. Then go through the door on the right to reach the Memorabilia room where you then climb the ladder at the top.
Theres loads more info this game, right here, with some cheats and tips, answers and LEGO Batman: The Videogame walkthrough.
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