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
00:05 6-BSP Blue Switch Palace
01:41 Firebrand Survival
04:06 4-14 Accursed Ruins (Secret Exit)
08:02 Corpse Demon Battle
10:01 4-S2 Palace of Dark Delight (Shambler boss fight)
29:00 5-S1 T'Leth (Synomium boss fight)
01:09:36 Zelda 2 Battle