Crash Bandicoot 2 - N. Sane Trilogy - 100% Walkthrough, Part 20: Un-Bearable (Gem)
Regular part of the level isn't too hard, but the secret path or whatever you call it can be tricky. However, I've played this so many times, it went down in a few attempts. It would have been fewer if I hadn't failed the very last jump once. Make sure to use the bonus exit to unlock Totally Bear.