What was the main currency in Club Penguin?

The main currency in Club Penguin was coins. Players could earn coins by participating in various activities and mini-games around the virtual world. These coins allowed players to purchase clothing, furniture, and other items for their penguin avatar, as well as to adopt and care for virtual pets called Puffles. The more coins a player had, the more they could personalize and enhance their penguin's experience in the game.