Separate from the main campaigns, the player can raise Chao as virtual pets. They have five attributes (Swim, Fly, Run, Power and Stamina) and a moral continuum from Hero to Dark. From the moment they hatch their stats can be increased with Chaos Drives or small animals, found in the main stages, which empower them to compete in karate and racing minigames. Their alignment gradually changes, based on their affection for the characters; for example, a Chao which likes Tails will gradually become more heroic. Playing with Chao increases affection, and when a Chao becomes fully Hero or Dark it assumes that form permanently. Although Chao eventually die, if they receive enough affection during their lives they reincarnate.