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South Park Secrets in Video Games - Easter Egg Hunting
 
When the computer's clock is set to April 1st (April Fool's Day), the creature's footprints will be smiley faces.
Contributed by KidDivinegon
In the game there's a mechanic where you praise or punish creatures. Praising them encourages a behavior, while punishing them discourages a behavior. Prior to a patch being released, punishing your creature after it had defecated caused it to become permanently constipated.
Contributed by IkiFoo