Merge cards. Merge cards need certain rules.
* Cards stack if they have the same sult and the same color
* Cards are destroyed if they are merged in pairs: Diamonds and Clubs, Hearts and Spades.
* Merge is not possible in the remaining cases.
There are 2 game modes:
Easy: new cards appear immediately after old cards are played.
Difficult: Each turn is 3 cards, you need to use them all before being dealt a new turn.