Reverse Gravity ASM file
This is an ASM file for 2 BTS blocks that allow you to reverse gravity while in ball mode.

It only activates out of a bombjump (unless you modify it, and will not hold you in the air if you are not in a ball mode. This patch uses Fool X-ray 03 to set normal gravity, and 04 to reverse it. While in reverse gravity, you bombjump down instead of up. Your gravity is also corrected if you demorph as well. If you want to modify this to work with a certain item, you can add a BIT to the BTS 03. If you need help with this, feel free to ask myself or in IRC.

Ideally, the BTS wants to be where ever the peak of the bombjump is. So unless you've modded something (gravity, speed, etc...), you will need to put the blocks 3 tiles above the ground, putting too many blocks in a close together causes some instability.