Mario World Boss Collection

Mario World Boss Collection is a boss battle game that is now available for you to play on our website. It is a ROM hack designed for fans who enjoy fighting bosses without going through long platforming stages. The hack pulls together 77 boss encounters from different Mario games and even from other classics like Zelda, Donkey Kong, and Mega Man.

I tried this hack myself, and the focus on bosses changes the way you play. Instead of slowly working through levels, you jump straight into combat. Every battle demands quick reaction and learning attack patterns. Some fights are nostalgic while others test your timing in new ways.

Here are a few more details about the game:

• 77 Boss Battles – Includes enemies from Super Mario Bros., Super Mario World, Mario 3, and crossover bosses.
• No Platforming Stages – You go straight into boss combat without filler stages.
• Variety of Styles – Each boss has its own attack system and rhythm, forcing you to adapt.
• Arcade-Like Format – Quick play sessions focused on action.
• Crossover Enemies – Fights from other franchises like Zelda and Mega Man appear in the mix.

How to Play

PC Controls:

• Arrow Keys – Move Mario.
• X / J – Jump (B button).
• S / W – Run or attack with fireballs (Y button).
• Z / K – Spin jump (A button).
• A / Q – Special action (X button).
• Enter – Start / Pause.
• Shift / Space – Select.

Mobile Controls:

• On-screen arrows control movement.
• Tap B to jump.
• Use Y for running or throwing fireballs.
• A works for spin jump.
• X handles special actions.
• Start and Select buttons are shown above the screen.