100% categories work as well and are often full of action. (HD version shown in here)

The player demonstrates that a lot of stuff happens in there. Note that many levels, the routes are still not very optimized and can be improved by starting to leave early and killing enemies on the way out.

Added 100% category. If you like to play glitchless, then 100% should be fun because you have to explore the whole level anyway (unless you somehow can float OoB below a level the whole time, not sure if that's a thing in this game).