Osomatsu-kun Hachamecha Gekijou

From Sega Retro


Osomatsukun MDTitleScreen.png
Osomatsu-kun Hachamecha Gekijou
System(s): Sega Mega Drive
Fujio Productions, Kodansha, Pierrot
Genre: Action

Number of players: 1
Release Date RRP Code
Sega Mega Drive
¥5,500 G-4005

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Osomatsu-kun Hachamecha Gekijou (おそ松くん はちゃめちゃ劇場) is a 1988 action game by Sega for the Sega Mega Drive tying into the Osomatsu-kun media franchise in Japan, which at the time saw a revival in the form of an anime series stared the same year by Studio Pierrot and is the first Mega Drive game that never left outside Japan. It is one of the few Mega Drive games to never receive full support for TMSS, meaning it will only work on most Model 1 Mega Drives.

It is virtually unknown who has made the game, since there is no credits in any part of it.


After Chibita and Iyami (the biggest rivals of Osomatsu) were defeated by the sextuplets, they decided do capture them (except Osomatsu). After discovering that your brothers were captured, Osomatsu sees a door that appears next to him and enters to rescue his brothers.


B shoots balls from a slingshot that only go a short way before disappearing. C jumps; Up+C jumps higher. Up enters doors. Down crouches. Start bring up some sort of items menu; Up in the pause menu select the item and A use that selected item.

Stages (incomplete)

The game is divided into three main stages, which are subdivided into four areas (the main area, the sky area, the water area and the underground area).

OKHG MD Stage1A.jng Stage 1 - Momotarou Densetsu (Legend of Peachboy)
Sub Boss: Momotarou Chibita
Boss: Kabuki Iyami
Stage 2 - Snow White
Sub Boss: Witch Dekapan
Boss: Snow White Iyami
Stage 3 - Prehistory
Sub Boss: Smilodon Iyami
Boss: Dinosaur Iyami

Magazine articles

Main article: Osomatsu-kun Hachamecha Gekijou/Magazine articles.

Promotional material

TV advert

BeepMD JP 00.pdf

Print advert in Beep! MegaDrive (JP)No results # ()

Physical scans

Sega Retro Average 
Publication Score Source
40 №1990-02, p69[1]
33 №, p85[2]
58 №?, [1]
Sega Mega Drive
Based on
3 reviews

Mega Drive, JP
OsomatsuKun MD JP Box.jpg
Osomatsukun MD JP CartTop.jpg
OsomatsuKun MD JP Cart.jpg
Osomatsukun MD jp manual.pdf

Technical information

ROM dump status

System Hash Size Build Date Source Comments
Sega Mega Drive
SHA-1 ?
256KB 1988 Cartridge (JP)