I have a number of weird and odd puzzles. But this one... I am just baffled. It was presented at IPP for sure... but the original puzzle has been modified with stickers to restrict movement of some of the rotations. Makes the objective pretty clear... make each side uniform with the same color. However, after 22 years... I would be careful with the stickers. Just saying.
It is an oddity... a very fun IPP puzzle and collectable... and I think you should add it to your collection.