Use this awesome hack I found. ( works for me, I tried, got around 3400 credits!)

1. open cheatengine and robot rage
2. select Robot Rage in the process selection.
3. Log in, make a new robot and select the new robot. now, go to the buy menu.
4. Search 50 ( starting cash ) . you'll get
alot of results.
5. buy a dagger.
6. search 40 in cheat engine. you should only get one result.
7. add the address, right click and select Find out what writes to this address.you should see a window with buttons at the side.
8. Buy another dagger.
9. expand cheat engine and look at the window. there should be a code. select it and click replace. Replace it with the following text:

asdafe4563 ( small letters )

10. Buy a plow. Notices that your money does not go down when you buy it ( if it worked properly. )
11. Don't mind the pop-up that notifies you you bought it. just keep on pressing buy now. you should get around 40 for a good robot.
12. press exit before robot rage hangs, exit cheat engine , restart your browser, log in and sell your parts. Hey presto, Lots o cash!

Using this cheat, i got large chassis and tower, flamethrower, 2 alkaline batteries, six large wheels, large engine DELUXE, and a spear gun whith a lot of money left over!!!!!!