IRO3A is a mind-bending puzzle game that challenges players to match at least three like-colored slots to make them disappear and increase their total points. The game features a x board with tiles, each having slots where players can place color bands to solve each puzzle. The goal is to clear each level with stars by achieving high scores. Players can match color slots in rows and columns, and if they manage to complete a full row, their combos will start adding to their score.