The scenario lock system locks some routes until Sigma can fulfill certain requirements. When you replay the game Sigma, the protagonist, retains his memories because he (well, the other Sigma) is from a parallel world.
Extreme Escape Adventure: Good People Die has two difficulty levels, hard and easy. Pick easy and the characters you enter rooms with will give you hints. In addition to searching for items with the touch screen, Chunsoft added block pushing puzzles as a mini-game.
Extreme Escape Adventure: Good People Die comes out on February 16.