If you use different cats each time, though, each one can get the Experience rewards. The rule is not that a player can only get experience once; it’s that a cat can.
Age: Although the action in this adventure clearly all happens over the course of a handful of days, the presumption is that this is the most interesting and exciting thing that happens to your cat during the whole of that moon. Increase your cat’s age by 1 moon and make any appropriate improvements described in Chapter Four of the game rules.
Skill: On top of the improvements your cat gets from aging, he or she also can gain 1 level in one of the following Skills: Focus, Ponder, See, Smell, Swim.
Knack: For surviving such close and prolonged interaction with Twolegs, your cat also gains one level of the Twoleg Lore Knack.
More adventures can be found at the back of each novel in the Omen of the Stars series, and you can find extra information at the warriorcats.com website.