This expansion to Black & White isn't too bad.
In my experience for playing Creature Isle, some of the challenges aren't too bad like the tortoise's race or the gorilla's wrecking challenge but there are some others I found hard or just frustrating like the rhino's duel or the cow's bowling spree. For Mercurio's challenge, it's a little too easy compared to Naxo's so it's considered a joke.
I do like the fact they added two new creatures to the expansion. I think the chicken creature is very cute and I adore its clucking noises. Something I would like to tuck in at night. For the crocodile, it's very odd in an amusing way. I find it strange for the croc to pretend he's playing a guitar to impress my villagers sometimes but he is a cool creature to own since it's cool to keep a crocodile.
May the source be with you. Well...that's what Naxo always says. However, when my creature achieves the Power Gauntlet after dueling all the creatures within the guru ring, where in the world of Eden is this so-called 'source'? There has been at least one time my creature almost attempted an invisible force on his enemies in a duel afterwards but it hasn't really worked. They should've had it to where the Power Gauntlet either doesn't exist at all or it works perfectly. This is my greatest pet peeve for Creature Isle but pardon my french.