When you first open the game youll notice that you have a counter next to the "start game" button. The number will be around 800ish. Every block you place knocks it down by 1 and when you reach 0 it wants you to either spend money on turns watch a video for turns or wait 3 hours. It will stop you in the middle of a game if you run out. This was to annoying to me to the so I deleted it. There are other match 3 games on the App Store go play one of them.