
2k3 - This is an attempted complete overhaul of SMB3. 3 - Worlds 1-4 are changed, changes the levels and makes the game more difficult. SMB3 - 2nd Run - A good level-only hack by Recovery1, completed to World 8.
Smashing Pumpkin Bros 2 - This is the second of two hacks made by Steve and David Pukin about the band Smashing Pumpkins. A level design, graphics, text, and gameplay hack by Quick Curly. Mario In: Some Usual Day - An excellent hack that is very similar to Mario Adventure in that it seems much more like a brand new game based on SMB3 than another simple hack. Over 100 new levels, new powerups and loads of secrets, this is a real good one. It's basically a brand new game using the SMB3 engine as the base. Mario Adventure - This hack isn't really a hack. It goes from world 1 to world 3 and it all looks like a dog's breakfast. Luna World - This is also a little bizarre. They include two enemies which don't appear anywhere else: Gold Cheep Cheeps and Green Parabeetles. Lost Levels - This patch allows you to unlock a series of "lost levels" which were apparently used in the development of SMB3. CBMario3 - This hack changes the first two levels and makes them more challenging. Carnage 3 - This is a hack replacing the enemies with Spiderman villains. Vegas - An editor for the bonus card game. SMB3 Workshop - A newer editor: edits levels, pointers, graphics, palettes, variables, etc. SMB3 TSA Editor - An editor for the 16x16 TSA (Tile Square Assembly) used in the game. SMB3 Text Editor - Edits most of the text in SMB3. SMB3 Discombobulator - A popular level editor. Mario Improvement 3 - Program and source also available here.