Tekkyu Fight! The Great Battle Gaiden

A battle for the universe between the Super Iron Ball and the Iron Devil King ends after a million years with Super Iron Ball victorious, but put into a long slumber. At present, the Dark Brain has revived the Iron Devil King, and is threatening to devastate the universe once more. At the point of defeat, the four heroes, Ultraman, Kamen Rider, Gundam, and Fighter Roar are granted the power of the Super Iron Ball and ready to fight back the Dark Brain Cult.

The game consists of eight platforming stages. Each stage has the player control one of the four heroes. In addition to a retractable iron ball weapon, each character has their own gadgets with unique abilities, but limited power. By the end of each stage, the player will fight a member of the Dark Brain Cult.