Mushroom Kingdom Fusion (and the Cave Story Level)

Mushroom Kingdom Fusion is a 2D Mario fan game based strongly off of Super Mario Bros 3 in its controls. However, that is just the surface of this massive fan game, as it incorporate Characters, Levels, etc from other gam franchises (hence "Fusion"). How big and expansive are we talking?

Taken from the Itch.IO page (where you can download the latest release, V0.85 Tangerine Rev C as of this OP):

• 21 playable characters including Mario, Sonic, Mega Man, Samus Aran, Simon Belmont, Kirby and more! Each character comes with their own unique playstyle, weapons and power-ups.
• Over 200 levels spanned across 9 Worlds.
• Fusion power-up suits like Halo’s Spartan Armor for Mario, Duke Nukem for Wario and Eri Kasamoto for Roll.
• Guns from a variety of games like Metal Slug, Doom, Halo, Contra and Quake.
• Hundreds of enemies to keep you on your toes.
• Over 80+ bosses, including 9 World bosses, to test your skills.
• Controller support

For more details, the Fandom Wiki for MKF is actually a great place to look.

History and Latest Release​

The game is built in GameMakver v8, a rather old Development Tool (would take too much work to port MKF to port it to something more modern).

This game has been in the works since 2007 and is a true love letter to video games (especially any that have been around between the 80s and Early 2000's). It's been in and out of development a few times, but has a very dedicated Dev Team looking to finally complete it. I'm actually a Developer on the Team and recently we released v0.9. See the Trailer here:

Cave Story Level​

In this version we added a Cave Story Level (Mimiga Caverns). You should see a bit of it in the Trailer (4:32). I've spent about a year designing the level (it's probably one of the longest in the game), Cave Story Discord User aikyuu programmed several Cave Story enemies and Cave Story Discord User Yobonnie created several custom sprites for it. The Boss Fight for Mimiga Caverns is unfortunately not done yet (aikyuu is currently still programming him) and should appear in a future release, but everything else in the level itself is done (minus minor tweaks I have been making to it).

If you're having problems reaching the level (it's near the end of one of the last and harder worlds) or you want to just see a video of it: a YouTuber called RCBlazer who has a long-running MKF video series of the game through it's development did a whole episode showing off all of Mimiga Caverns:

 

Updated! No need to hide the secret of the Cave Story level we added to the game.