If you're stuck on the 3rd zone of mama bear's level, read this!

[Niki]

This level is bugged... to complete the 3rd zone, you need to collect the ring piece (dropped by the bears, you have to destroy all 3 bears, the last one will drop the ring piece) BEFORE you collect all the souls shards!

DON'T COLLECT ALL THE SOULS SHARDS BEFORE THE RING PIECE, OR THE BARRIER OR THE BARRIER DOES NOT BREAK!

there's another bug... when you leave the zone, the game says you need to collect 306 soul shards... it's a bug, you don't need to collect theme anymore!

I hope this helps someone! (and sorry for my terrible english!)