One day a wicked plot to bring the world into ruin was instigated by King Demon Beelzebut. He kidnapped the merciful King Pamera, his beloved queen, and the fair princess, and imprisoned them in a cursed pyramid. The mighty brothers fought bravely to save the royal family, but every one of them was defeated--all except Jack. Now you and Jack challenge the King Demon to a final fight in order to restore peace to the world.

To put an end to Beelzebut's wicked rule, you must find your way through a labyrinth of 16 Royal Palace Rooms that lead to the pyramid. On your quest, you must detonate bombs and battle with a variety of fierce palace villains. Treasure Chests containing Mighty Coins and Mighty Drinks give you more power and time. But don't be greedy. Collect too many Mighty Coins and you'll be sent to the Torture Room. Are you Mighty enough to save the Royal family?