Hot Brain: Fire Up Your Mind Cheats
If you want a mental challenge rather than a physical one, you should look into Hot Brain. Sometimes all these video games can sort of fog things up, you know? Gotta "stretch" a little...
It's the most obvious cheat code of all time. Select New Game from the menu and then enter "Cheat," which will give you a brain temperature of 119.99 in all Five Categories with only one achievement left to complete each challenge.