When Mario touches this non-solid block, it allows him to jump off while in mid-air when you press the (spin) jump button. Perfect for platforming levels.
Note: you can only jump if Mario is falling, not rising (so press jump when Mario is falling to make this work).
Another thing is if you make a staircase of this block, change 0x07A78 from [D0] to  to allow free vertical scrolling so the screen won't obscure Mario on top of the screen.
Credit not necessary, I learn this using Mario's y speed, binary commands, and other stuff.
-fix the flying cape mario can "jump" on these blocks.
-mario can now spinjump off these blocks
-compatable with water on/off levels
-easy labels to change how high mario jumps off the block
-now doesn't cancel Mario's long jump.
-remove having stompable enemies around these block makes consecutive 1-up stomp possible if more than 1 screen line of this blocks, now resets the consecutive stomp counter if mario jumps off.
-fix the problem with spinjumping in midair while carrying an item
-added new conditional airjump blocks (like having to alternate two different jumps in order to use them) for the challenge!
-added an optional uberasm code that fixes the origional smw's glitches with performing certain actions while spinjumping.
-added an option that the blocks will disappear when used.