I got this cheap. 20€ when it was new.
I never sold it, because it's so fun

The animals look hilarious and every one of over 50 beasts has different controls and special abilities... in 50 different levels... and the funky elevator music comes from speakers you can destroy. and the animals pulsate with the beat. the missions are always different and some are really innovative.
It's a fantastic game - there hasn't been much of that kind.
But it also had a serious bug, so 99% was the maximum we could get. I hope they fix that if it comes to VC.