Trying to solve Room 15891 (but not yet...)

[Semi-Native]

Okay, I just replayed. There's no hidden trick, you just have to be really fast. Jump off those belts as fast as you can, then pull the lever at the top, which reverses the block the key is on. You'll sink to the floor, and be ready to run and jump for that key before it gets higher than you can reach.

Good luck!