From Creatures Wikia
Creatures has three worlds, each one different and running seperately. They are connected by portals that only open after a certain number of norns are living in the current world. There are no ettins in this game, and grendels only appear in the island and jungle worlds. The jungle world contains a 'game-within-a-game', a simple, almost pac-man style video game.
In this game, norns have visible health bars, hunger, pain, tiredness, exhaustion, boredom, etc. Color mutations do not occur, and norns use only predetermined full sentences, "I am hungry!", "Ouch, I am in pain!", etc. The player is not a hand but Scrubbey the fairy. Scrubby uses only a few sentences, such as "come here." "go away" etc. Norns do not use Bibble, but know english from the moment of birth. Eggs can not hatch without the incubator.
Creatures PS1 is more of a game than a simulation, but, while you have goals, you do not have to achieve them.
Creatures PS1 is generally disliked by many of the Creatures Community, due to it's lack of depth and genetics. Other features available in the PC games are also not possible, such as downloading new Cobs, adopting new Creatures, and colour mutations.
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