In this game mode you'll be able to earn coins by previously betting on a set amount. There are different levels that have different costs, and the number of coins that will be taken will correspond to the level you enter.
If you win the game, the prize will be credited to your account. It will include the coins subtracted at the beginning.
For instance, if you play in a level that costs 1,200 coins and win, 2,000 coins will be credited to your account, and they will include the ones you initially bet on. Therefore, you will earn 800 coins apart from the ones from the initial bet.