Bloons TD (Series), Clash of Clans, Plants vs. Zombies (Series), Fieldrunners (Series), Pokemon Tower Defense, Kingdom Rush, TowerMadness, Tower Duel, Military Tower Defense, HexDefense, Beware Planet Earth, Defense Zone, TapDefense, Towers of Oz, Swords and Soldiers, Innotoria Tower Defense, Iron Marines, Tiny Guardians, Anuto TD, Realm Defense, Go home dinosaurs, Saturn Defense, Radiant Defense are some alternatives to Robo Defense.