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When you enter the room with a giant green chess piece painted in the wall look for a door that's located way above you. First locate a cube painted in a corner of the room, grab it and use it to go up a ledge then locate the chess piece and grab it. Finally use the chess piece and cube to reach the door that is located way above you to reach it. Enter it and walk through the corridor until you see a trash can, grab a dice and voilá!