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
00:38 3-10 Power Tower (Elec Man boss fight)
12:01 Doc Robot Battle
12:30 Sniper Joe Battle
14:32 3-11 Windy Fortress (Normal Exit, Air Man boss fight)
25:28 3-11 Windy Fortress (Secret Exit)
27:58 3-S2 Temple of Uranus (Uranus boss fight)
33:38 Teleporter Course
34:40 3-S2 Temple of Uranus (trying to find Secret Exit)
41:50 Robo Animal Battle
43:22 3-12 Jungle Jurassica (Slash Man boss fight)