Rectangular mach

@PvB - much nicer! Thanks!

I haven't finished the level completely as intended yet.

Spoiler: Shortcuts

It's just that there are nearly an infinite number of ways to get B to the win without crossing over to the second half of the puzzle.

1. If you catch B with the first slider, then use Tripping on Air to have him fall at the wedge, you have a couple of options:

1.a. You can use a Sideways Springboard Stair to have him hop to the win.

1.b. You can send him under the draggable for the second slider (just make sure to stop him there as he'd want to keep going due to Claustrophobia), and then you can smash the draggable onto him as you send him away and this will push B onto the win.

1.c. You can send him under the draggable for the second slider and then drop it before he gets there. B will Autopilot onto the draggable and continue a bit due to his expected Claustrophobia. Now he'll be on the back end of the underwater platform from where you can walk him to the block nearest the win. He'll get zapped and fall on the win.

2. There are also several ways to get B down to the large platform underwater using Autopilot Falling from above. Once on the platform you can walk B to the block nearest the win at which point he'll get zapped and fall on the win.

3. If you just let B land first, then knock him off the gamespace, you can then Boogie Bot him back onto the underwater platform at the exposed corner. From here, sending him to the block nearest the win will have him get zapped and fall onto the win.

4. As B is falling, you can use the Walking on Air trick to have B try to get to the wedge (i.e. tap the wedge as he's at that same elevation while falling) and since he can't autopilot there over the two metal pillars, he'll instead fall and autopilot onto the underwater platform. From here, sending him to the block near the win will have him get zapped and fall on the win.

All of these are much easier than trying to figure out how to get B over the grass block between the two sets of stairs.

Edit: warning the following spoiler can give away the intended solution as it is awfully close.

Spoiler: Intended?

I got lucky and squeezed B up onto the near side of the stone pillar with the ball on it. The ball was knocked over and (instead of going towards the win as first expected its purpose to be), the ball got stuck in the automated sliders thereby actuating some magic pathways. From here B was able to walk all the way around (the long way) down to the set of stairs closest to the wedge. From here it was just a matter of picking the path of choice from my spoiler in my previous comment to the win.

I want to like this level. In fact, I want to love it as I admire all the effort you put into it. I believe that I have solved it now the intended way. It's just that all the shortcuts have me confused on how to rate it and likely I won't.

Spoiler: Hint #1

No exploits are required except for Autopilot.

Spoiler: Hint #2

The ball is important, but it is not used to fall on the win.

Spoiler: Solution

Catch B with the first slider before he finishes his fall. Lift the second slider and walk B to the first grass block after it. Lower the second slider back down. Slide the first slider back to its original spot. Send B to the draggable of the first slider and before he gets to it, slide it back out of the way. B will now autopilot onto a rail lined up with the ball. With just a little speed, slide the first slider against B such that he is flung onto the block beside the stone pillar with the ball on it. The ball should roll into a hole and actuate an intricate mechanism that completes a path all the way around to the stairs below the wedge. Send B below the wedge. From here there are two main choices:

1. Lift the second slider and send B below the draggable of it, but before he gets there, lower it such that B will autopilot onto it. Because of the Low Ceiling expected at that spot, B will continue to the far side of the underwater platform. From here, simply walk B to the block nearest the win. Unfortunately he will walk close enough to the zapper such that he will be zapped and fall on the win.

2. From the bottom stair under the wedge, you can use the Sideways Springboard Stair exploit to get B to the win. Simply tap the sand block before the stair block and then quickly tap the win block. B will skip over the bottom stair to the win.

Walkthrough movies (one for each version/option at the end):

Spoiler: Movie (option 1)

Spoiler: Movie (option 2)