What can I do with the coins?

You can buy extra moves when you have used them all in a game to continue playing that game. You can get 5 more moves for 900 coins, then an additional 5 more for 1400 coins and it gets more expensive the more you use. If you can finish a tricky game within 5 moves it can be worth it... but if you can’t then you will use loads of coins, or have wasted them if you end up not completely the game after all. You can also buy power-ups with coins. They are very expensive (starting at 1400 coins for 3 of one kind if power-up. Again, though, if you could finish a game with, say, the removal of one gem, or a line of gems, then this is useful. However, you earn free power-ups as you progress through the games/ tiers... use them wisely and they can progress you nicely. Remember to claim your free coins each day, they mount up and can get you through a tricky game with the 5 moves or a power up.