95		Iron Sea Defenders (PlayStation 4, 2017)
74		The Keeper of 4 Elements (PlayStation 4, 2016)
73		The Castle Game (PlayStation 4, 2015)
65		Lock's Quest (PlayStation 4, 2017)
65		Day D: Tower Rush (PlayStation 4, 2017)
65		Medieval Defenders (PlayStation 4, 2017)
54		McDroid (PlayStation 4, 2016)
52		Plants vs. Zombies (PlayStation 3, 2011)
52		Final Horizon (PlayStation 4, 2014)
45		Fort Defense (PlayStation 4, 2017)
45		Fort Defense: North Menace (PlayStation 4, 2017)
45		The Onion Knights (PlayStation 4, 2017)
44		PixelJunk Monsters 2 (PlayStation 4, 2018)
40		Crystal Defenders (PlayStation 3, 2009)
40		Fort Commander II: Counterattack (PlayStation 3, 2010)
40		Fort Commander: King's Gambit (PlayStation 3, 2010)

Notes: Games similar to Royal Defense, Games like Royal Defense, Creobit, Good Games, 8floor Ltd., PlayStation 4, Strategy, Tactics, Fantasy, Tower Defense, Real-Time, Bird's-eye view, Sony PlayStation, PSX, PS1, PS2, PS3, PS4, Game Similarities.