runouw.com

Suyo wrote:So I tried finding more disabled tiles using this thing I coded in ~5 minutes.

These Block IDs are unused:

2x 2y 2z 2{ 31 3R 3S 3T 3U 3V
3W 3X 3Y 3Z 3[ 3\ 3] 3^ 3_ 3`
3a 3b 3c 4{ 51 5_ 5` 5a 5b 5c
6H 6I 6J 6w 6x 6y 6z 6{ 71 7[
7\ 7] 7^ 7_ 7` 7a  7b 7c 8J 8{ 91

Most give a blank tile (not the grid tile, a blank tile) but there were a few which had a different effect:
31: 30 coin destroyable brick
3c: the disabled blue brick tile
7[: infinite odd. It's invisible, and you can walk on top of it. When walking into it from the side however, various stuff happens - including being pushed into the ground or being crushed. Jumping into it from below causes being pushed to the side when on the very right.
7\: Seems to be an invisible slope form bottom left to top right (like this: /)
7]: Again an invisible slope, this time it's top left to bottom right (like a \)
7^: Invisible block! Epic!

So yeah, have fun with those.
I planned to make a custom level designer ones. Maybe these could be implemented. Or something. But I'm too lazy. Note to myself: Become unlazy.

EDIT: also Republic found the ID 12, which creates a grid tile in the actual game.