So I've started working on this hack recently. Currently working on world 2 secrets
Download the lastest demo here
Full plot:
After failing over and over against Mario and Luigi, Bowser created a big plan. He decided to invade Mushroom Kingdom. At that time, Mario and Luigi was on a vacation on Dinosaur land, but Peach stayed in the kingdom. Saw this as an opportunity, Bowser decided to start the invasion. With millions of troops, his army quickly took over all the kingdom. The news got to Mario and Luigi. They decided to not come back to the kingdom yet because Bowser's army was too strong. While they were staying at Dinosaur land, in Mushroom Kingdom, many revolutions were happening, but all failed. After many years preparing, Mario and Luigi came back to Mushroom Kingdom and start a new revolution.
Some screenshots:





Crystal Cave 1 review (video)
Normal exit
Secret exit
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My hacks:
Bowser's Castle (finished)
Bowser's Castle 2 (finished)
Super Mario World - Mushroom Revolution (Work in progress)