I did put this at the beginning:
Although, like said, any bugs or incorrect stuff you do point out is greatly apreciated.
Welcome, to my ASM guide. Now, before we start, I am still learning ASM fully myself, so, there may be some bugs still in this guide. So, it is important to ALWAYS back-up your hack-work before making changes. Plus, I'm using Sonic 2 disassembly, so this guide is based on Sonic 2. If you're hacking Sonic 1 or something else, you can read on, but the activities will be different.