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Every guide I've found regarding the codes mentions that one only needs to hit the Tab key in order to open up the cheat option, but for me hitting the Tab key doesn't do anything. I tried going into the game's Properties, as some mentioned a need to enable cheats, but couldn't figure out where to input that option.
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Stupid question, but do you actually type the code after pressing Tab? The Tab key itself does nothing, just allows you to type the code.