Basically...if u don't know how to play 21, you take turns and say up to 3 numbers...so if ur first you can say 1, 1 2, or 1 2 3. For example if u say 1 2, the next person can say 3, 3 4 or 3 4 5.. And so on...the first person to GET TO 21 CAN GET HIT BY ALL OTHER PLAYERS...