Collect every card on the board! You start with one numbered card at the bottom of the screen. Click on a blue card to add to your score card or a red card to subtract from it. Collect all the cards without letting your score go below 0 or above 21.

Drag any card to your hold zone to save it for later. You can only keep one card in there at a time, and you must use it eventually!

When you win a round, you'll collect gems. You can use these gems to change the style of your cards or discard a card for 10 gems. To discard the card, click on the card from the board and drag it into the trash can.