Dungeon Defenders: First Wave is a multiplayer tower defense and RPG action game in which players build defenses and control heroes to fend off waves of enemies. In this game, players explore a fantasy world where they must protect their crystal from invading monsters, utilizing strategic placement of defenses and hero abilities. It stands out with its blend of tower defense mechanics and real-time combat, along with the ability to play cooperatively online or locally, offering a versatile multiplayer experience.