Maybe instead of having "cheats" there should be things more like "mods" that can make the game easier, harder, or just different. Good ole invincibile and unlimited ammo is always good, but what about 3x as many bad guys? or what about headshots = explosion? or what about 10x bad guys, headshots = explosions, and unlimited ammo? I prefer not to use cheats that just allow you to blow through the game and not actually have to use any skill to play. But having mods that alter the game to your liking while keeping it a challenge is really what i would go for