The first time I ran through this game, it took me a few days to finish it. Any time it got too frustrating (lookin at you, ice level), I'd stop and come back the next day and try again. By the end of that run, I'd only unlocked 2 of the guardians, and I decided to go through it again and find them all.
Now I'm stuck on the guardian for level 7. I found the key, I found where the lock should be tucked away, I found the hint that you enter from below, but I still can't find the entry point. Any other tips and tricks to get in there?