For the PC game, there are some Alias trainers out there that you can DL that will give you infinite life/ammo. But come on now, the game is so easy to beat. You don't really need a cheat. I mean the AI is so retarded, they'll litterally just stand there and let you shoot them. And also notice that Syd's health will go back up, if you just stand around a bit. So that's a technique I"d use if I'm in a real jam.