Crusader of Centy is an action-adventure game developed by Nextech for the Sega Genesis. The story centers on Corona, a boy who has just turned 14 years of age and must inherit his late father's sword to fight the monsters that threaten the human race's existence. Gameplay uses an overhead perspective and focuses on exploring, battling enemies with a sword, and solving puzzles. As the story progresses, numerous animals join the hero and aid him. They are used in gameplay like weapons or tools, which often grant passage to previously inaccessible areas.

Early in the game, Corona finds himself losing his ability to speak to fellow humans, and instead gaining the ability to speak to animals. Some of them will join him, lending Corona their abilities while they are "equipped". Each animal has its own special technique. The very first animal the player gets is Corona's pet dog, Mac (US version), or Johnny (UK version). He can hold enemies down for Corona to attack. Later, the player gets a penguin, named Chilly (US version), or Penguy (UK version), which will power up Corona's sword with an ice-attack. Corona can equip two abilities at a time. A total of 16 animals can be obtained.