BT21 POP STAR is a casual match 3 mobile games developed by LINE FRIENDS for mobile. The game is themed on the popular characters BT21 from LINE FRIENDS. Players can team up with the cute characters to clear various stages and collect puzzle to complete their photo gallery. There are two game modes for players to choose with. Players can choose to play solo or play with multiple online players. They can also join a fan club to communicate or compete with their online friends.