If you see a cheat that gives you "extra credits" they are completely wrong. But I have three cheats that do work.
1. If you press left and right back and forth, your car will go forwards without using batteries.
2. If you are almost out of batteries, use cheat 1 and get right next to the edge. Then have a weapon that uses batteries (drill, rolling pin, and regenerator) and when you run out of batteries they will push you off and you will float. Eventually they will be so confused and they will kill themselves-you will win!
3. This cheat is strange, but true. If you press 1, 2, 3, and 4 in order, you will kind-of see behind you.