Click the money. Once you have 100 money you can buy items in the shop. Use the arrow buttons or arrow keys to navigate the shop. One row increases MPS (Money per Second), One row increases MPC (Money per Click), and one row has bills. Bills multiply all of your money. Buying a bill more than once does nothing. You get achievements too. You win by buying the "Win!" item in the shop.
Number counter tutorial by griffpatch. Having a touch screen makes this game a lot easier. Now mobile friendly.