In one of the latest Gamespot Gameplay podcasts they started discussing games with gameplay mechanics and/or limitations that are justified by the game world, like the mission requirements for full synchronization and the fact that you can't kill innocent people in Assassin's Creed, or the hud and health indicator in Dead Space.
There is also stuff that contradicts the fiction in some games. In Resident Evil you can get bitten by a zombie, heal yourself with a spray or herb and have it not infect you.
Can you guys think of other examples of both cases?
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