Quote: "Strange, I can get past the boot that comes up, but not the one that comes down. And what exactly does F do?"
To get by the boot that comes down, just clear the boot coming up then turn back right and pass through it you will fall to the screen below. stay to the left to avoid the guy that tries to kick you then go hard right and try to land on the | figure not the boxes (this can take alot of tries). Jump off the screen to the right there will be three platforms, the first 2 fall as you jump on them so be quick the last one goes up to smash you into the ceiling so walk off it. when you jump off the screen to the right there will be some boxes to jump on off the right again and my best bet is a floating cloud that carries you to the next screen. This is as far as I have gotten.
I have been able to kill the teddy bear pretty easy but have not found anywhere else to go. If you can lans just before the ledge after the first boot you can try to jump back out of the way of the falling boot, if you do you can climb up the chain a few screen then get to some mountain type things, you can go across these for a bit but then there is a point where spikes start to pop up from the floor, that is as far as I have gone in that direction.
As for F I have no idea what the hell that is supposed to be.