Mushroom Kingdom Fusion

"Mushroom Kingdom Fusion" is a non-profit, fan-made Mario crossover game featuring 17 playable characters with unique abilities, over 200 levels across 9 worlds, and 80+ bosses. The game includes Fusion power-ups, such as Halo's Spartan Armor for Mario, and weapons from various franchises like Metal Slug and Doom. Players can join the Discord server for updates and potential opportunities to contribute to the game's development.