If you get stuck on any difficulty
If you get stuck on the gas in the cave go into the small rooms the press x on them whatever one you do first it should speak in a voice steam pressure at 66 percent the second one you do it should say steam pressure at 33 percent and for the third one it should say steam pressure at 0 percent then you can go on to completing the level this works on any difficulty
P.s zombies come later in the level and through out the game.
The machine gums attached to the wall next to the power don't shoot the power but go down stairs and shoot the till they both get destroyed happy gaming
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