Cool concept, pretty design. The controls could stand to be redone, specifically the number pad. It's too small and not well laid out.
Fun concept but the interface, specifically the number layout is HORRIBLE. Edit: updated layout options greatly improved the experience, rating updated.
Numbers should be in standard keypad format I spent more effort trying to *find* the right key than anything. Made the game unplayable. After that, the game is just boring. Nothing changes.
Improve interface There is no exit button and the number pad should be redesigned as has been already mentioned.
Math and a Game?!?!?! I am not a fan of math, but I do like games, and well this is a good game so I guess I like math now.
* New standard button layout
* Added options button in main menu to swap button layouts
* Back button functionality
* Coins are now easier to obtain
* Fixed bugs regarding the back button and input