Sometimes a box will pop up saying that rating Egg Baby will give you 2,000 coins. Tap the check mark and it will go to the app store. Don't review Egg Baby, just exit the app store and go back to Egg Baby. There will be 2,000 coins in the purple flying piggy bank.

Warning: The box will pop up randomly. You can't tell when it will come. So don't say that you can't see it or you don't know how because you won't be able to control it.