Am I doing something wrong here? It feels like there's only one possible solution to this level, but the timer on the timer crate isn't /quite/ long enough to do that solution, since it requires destroying L-piece blocking the final jump from below, then doubling back and platforming up the horizontal bar below that. The crate keeps breaking just as I reach the spot I need to place it in order to jump from it....

Is the door in lay2 that requires 25 keys unlockable? Currently, I only found the key 21.