Recently I discovered that people have actually started working on Mushroom Kingdom Fusion again, after it was in hiatus for a long time. It used to be maybe my favourite fangame ever, combining all kinds of different franchises while still keeping the Super Mario Bros 3 / Super Mario World style gameplay.
The game still isn't finished but I'm surprised they're working on it at all.
Levels included in this video:
00:00 Intro
00:23 6-??? Whirlwind Vale
08:21 6-1 Mystic Plain (Looking for Secret Exit)
12:27 6-F1 Water Temple (Anglerfish boss fight)
28:37 6-3 Land of Lattice
39:24 6-4 Fillmore Weald (Secret Exit)
44:44 6-4 Fillmore Weald (Normal Exit)