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First, enable 'cheat codes'  in the settings menu (if you haven't already done so). After that, you should be able to see a circle holding a purple vial appear in the top right corner of your screen while you're playing the game. Click on this circle and enter the cheat code password, which is written if the file. Once you've done that, you should be able to see a cheat menu with a list of cheats whenever you click on that circle.