Hi, thank you for trying my game. This is Scopa 15, to take you have to score 15 points, so if there's a king on the table you can take only with a 5 (10+5=15). In this app, if you want, you can find the link the the other version of Scopa, where the rules are different and with a king you can take, for example, another king or a six and a four.