Coin Otter is a casual match-3 puzzle game. Players need to select and move 3 tiles with the same pattern into the "floating plank" below to achieve "elimination" from a pile of tiles printed with different patterns and randomly stacked. The game is successful when all tiles are eliminated, and the game fails when the "floating plank" is filled with 7 tiles. The purpose of the game is to test the player's observation and reaction skills, while also having a certain degree of fun and challenge.