Hydlide is an action-adventure role-playing video game for the Nintendo Entertainment System (NES). Released by T&E Soft in 1986, it was one of the first games of its kind on the NES console. Set in a fantasy world, players control a hero tasked with rescuing a princess and defeating an evil dragon. The gameplay consists of exploring a vast overworld, fighting monsters in real-time combat, finding treasures and leveling up. The game is noted for its unique health system and music themes. Despite its innovative features, it has garnered criticism for its difficulty level.