Hopefully this is okay, as I read through the rules and didn't see anything that's against this. I was directed here from the Discord server.
Below is a zip containing my 100% save file and a Bizhawk cheat file for Colors DS. The save file is just for whoever wants to play around with it and see what they can find. I'm currently doing a TAS of the game with this to see how broken each map can get. Here's what the TAS currently looks like:
https://www.youtube.com/watch?v=7XIjNKHntDU
Some tricks that I know you can do with the speed hack:
- Slope launching (boost on a slope, jump, release the boost button and keep holding either A or B to go really high up)
- Layer swap skip (find a point where collision temporarily isn't active for a layer like slopes up to a higher point in the map or the left/right sides of a loop. Now boost away from or through that point and the layer swap shouldn't happen. Use this to skip massive chunks of maps, as it leaves a lot of stuff unsolid.)
- Rail clipping (boost while on a rail that's next to a wall to clip into or even go right past the said wall)
- Walking on normally unwalkable walls (if Sonic gets thrown at or pushed into a wall in the right way, he can run on it. You can then boost to the top of the map and skip stuff if combined with a layer swap skip.)
https://cdn.discordapp.com/attachments/280806848909541376/1068915310456995981/Cheats_and_save.zip
(And no, this doesn't contain copyrighted material.)