What can I do with coins?

[ProfBloom]

Hey guys, I've won like a gazillion coins, and I still have them because I cannot figure out what to do with them. When I click on them, all I get is the option to purchase more. I only seem to use tickets and thunderbolts in the game.

[PikaSquirrel]

You can use Coins to buy more Boosts and Keys at the bottom right of the main page where you see "Special Bingo", "Classic Bingo" and "Tournament".