Ultraman: Kaijuu Teikoku no Gyakushuu is a single-player action, hack'n'slash, beat 'em up, platformer, and fighting game in which players control Hayate, a member of the Science Special Search Party, tasked with defending Earth from large hostile alien invasions. In this game, players navigate through various stages, battling enemies with a ray gun and collecting energy orbs to power up their abilities, emphasizing fast-paced combat and platforming elements. It stands out with its sci-fi themes and classic gameplay mechanics, offering a nostalgic experience on the Family Computer Disk System, combining multiple genres for dynamic and engaging gameplay.