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To pass through each room, pick up a keycard then exit through the door on top. Use w,a,s,d or arrow keys to move your player. Use mouse to aim, left click to shoot / hold down for continuous fire / Switch weapons with #1, #2 and #3 keys If the game slows down on your PC, you can press P key to switch to low quality mode. It should speed things up with only text looking worse, the rest should still look fine