This video showcases EVERY SINGLE special element the appears in the e-World from Super Mario Advance 4 for Game Boy Advance. It shows the immense hacking potential that this game has, perhaps moreso than SMW. Everything is here so you don't need to watch through every level I put up to see everything. Enjoy.
Somebody PLEASE create a utility that can hack SMA4!!!! I'm dying to make levels that use all of this stuff!