Osomatsu-kun: Hachamecha Gekijō

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Osomatsu-kun Hachamecha Gekijou Cover.jpg
Cover art
Platform(s)Sega Mega Drive

Osomatsu-kun: Hachamecha Gekijō (おそ松くん はちゃめちゃ劇場, "Nonsense Theater") is a platform video game by Sega, which was released in 1988 for the Sega Mega Drive.[1] One of four launch titles for the Mega Drive, it is the only one to not see a release outside of Japan. The game was based on the manga Osomatsu-kun by Fujio Akatsuka, and acts as a promotion for the anime adaptation that premiered the same year; players controlled the title character and encountered many of the series' characters in a strange (but comical) world.[1]


Confronting one of the game's several incarnations of Chibita as a mini-boss.

The player controls Osomatsu, leader of the sextuplets, through a total of three stages, armed only with a short-range slingshot. Each stage has a distinct path the players need to follow in order to proceed, though each stage has a variety of different places to go. Each stage is divided into a number of separate segments, with Osomatsu traversing between them via a variety of ways, such as going through doors, falling down pits, grabbing balloons, or jumping on a golden cloud. In order to fight the boss of each stage, the player has to locate and defeat the stage's miniboss, portrayed by either Chibita or Dekapan, in order to locate and defeat Iyami, who plays the role of the stage's boss. Every time a boss or miniboss is defeated, Osomatsu's maximum health and slingshot range both increase.

The player can enter shops run by Totoko, where they can purchase power-ups using collectible yellow ribbons; the player's inventory is located on the pause screen. The shops also have mini-games, such as a slot machine and a small path-finding game. The player starts each game with three lives, and cannot earn any continues; additional lives are awarded by collecting six 1-Up Cards. Defeating enemies can cause them to randomly drop ribbons, health items, or (on rare occasions) 1-Up Cards.



  • Ribbons: Currency needed to gamble or buy items from Totoko's shop
  • Ramune: Increases Osomatsu's health slightly
  • Cupcake: Increases Osomatsu's health moderately
  • Chocolate Bar: Increases Osomatu's health greatly
  • Ramen: Increases Osomatsu's health even more
  • Totoko Doll: Completely restores Osomatsu's health
  • 1up Card (bearing Osomatsu's face): collecting six gives a player an extra life


  • Wings: Allow Osomatsu to fly for a short time, but disables his ability to attack
  • Octopus: Allows Osomatsu to run faster
  • Fireworks: Damage any enemies nearby
  • Monk's Robe: Makes Osomatsu temporarily invincible
  • Karashi: Destroys all small enemies on the screen
  • Bone Fish: Summons a small cat to help defeat nearby enemies