i used cheat engine 5.3 to do this.
first you make a new robot(opsional),then you use ir buy a high priced item like,(medium chasis,razor disk etc.)or you can use one of your own. so then go to the sell button on the top of your screen and click on the item.DON NOT SELL.then you open cheat engine.click on the computer icon on the top left of your screen.go all the way down(scroll), and click on iexplore.exe (theres two of them so click the one next to cheat.exe).once you click on that go to the sqare box on the right side of your screen(it should say enable speed hack).click on the box next to it to open it.there should be 2 bars saying speed and sleeptime.set the speed box to 0.00001 then set the sleeptime box to 10000 .now press set speed on the bottom of the boxes.it should make your screen look frozen but its not.keep clicking on the sell now button.for exactly 1 minute. then disable speed hack on the cheat engine by clicking the check box next to enable speedhack.then your screen will turn back to normal and you would have 200000000 credits depending on what item you have used so please vote if this cheat has worked for you. if there is a problem please contact me at email@example.com . i hope you get the cheats you need so truct me it took me a while to find a cheat.this is the site to download cheat engine 5.3 = www.cheatengine.org