If you suck at this game as much as I do (assuming that's even possible) and want to practice playing at the higher floors without constantly having to start from the first one, the idea of using the revive functionality probably came to your head. However, I'm certain the idea of paying real money for it most probably didn't (hopefully...).
Here's the brilliant, free solution: Icy Tower Classic Mobile Patcher. It will give you 2147483647 coins so that you can revive yourself 31 times in one game (but don't ask me why)...
Normally the solution would be to patch the APK to allow an infinite number of revives... But that would be easy, universal, reliable and extensible. You gotta admit that doesn't sound so "zb3"...
Therefore this solution is:
- not easy - you need to execute the patcher on your PC while the device is connected each time you want to increase your coins amount