Don't die in gas filled rooms.
When in a gas (or smoke) filled room, start rolling around (R2 + direction). Apparently while rolling Batman doesn't need to breathe. So you won't lose any health due to the gas. This can be very helpful when low on health.
Contributed By: Acquire.
When you beat the game, you unlock several things. It doesn't matter which difficulty.
Unlockable How to Unlock Prototype Batmobile (the one with camouflage paint) Beat the Batmobile missions Unlock 2 Batmobile missions Beat the game once Unlock 3 alternate Batsuits Beat the game once Unlock all movies and interviews Beat the game once Unlock Caped Crusader Suit Complete the game on any difficulty Unlock Dark Knight Suit Complete the game on any difficulty Unlock everything in Gallery of Fear Beat the game once Unlock World's Greatest Detective Suit Complete the game on any difficulty
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