Click on the green button to add cash, the red button to multiply cash, and the yellow button to square cash. Use cash to purchase upgrades to help you earn cash faster. When you get infinite money, you can rebirth to reset all progress but gain money way faster.
I tried to do (x * y)^z but I couldn't do it despite my efforts, so it is (x * y) * z * z. There is probably a way to do it alternatively, but haven't found it.
