Bloons TD (Series), Clash of Clans, Plants vs. Zombies (Series), Fieldrunners (Series), Pokemon Tower Defense, Kingdom Rush, TowerMadness, Tower Duel, Robo Defense, Gemcraft Zero, TapDefense, Guardians:Royal Journey, Genetic Invasion, Go home dinosaurs, Save the Cave, Microbes Defense: Germs Gone Wild, Saturn Defense, Radiant Defense are some alternatives to Realm Defense.