Osomatsu-kun: Hachamecha Gekijō

Osomatsu-kun: Hachamecha Gekijō (おそ松さん はちゃめちゃ劇場) or just known as Osomatsu-kun, is a platforming game released on Christmas in 1988 for the Sega Mega Drive, only in Japan and it is based on the manga and anime of the same name.

Since its release, it has become one of the most hated games on the platform in Japan, due to the immense disappointment and the legitimately terrible quality of the title.

In fact, there was a rumor that the awful quality of the title caused the author of the manga to attack a developer with an ashtray.

Hideki Sato, former Head of Research and Development at Sega expressed in an interview his frustration with the final result.

Why It Sucks

 * 1) The music of the game is atrocious, so much that it actually hurts your ears, and not only is it too loud, but also annoying, hence it's considered to be the worst music for the system.
 * 2) The game is insanely short, it's only three levels long.
 * 3) The level design is horrendous, resembling mazes (this was done to artificially extend the duration of the game), and the third level is a living nightmare.
 * 4) * Worst yet, some balloons throw you back to the start of the level.
 * 5) The enemy placement is dreadful and there are places where avoiding damage is impossible.
 * 6) For some reason in one of the levels you get damaged by bubbles without any warning that they are hazardous.
 * 7) The first mini-boss of the game moves too fast and travels distances too long for Osomatsu to dodge.
 * 8) The bosses of each stage are extremely easy, or at least they would be if the controls didn't blow.
 * 9) To get powerups in the houses, you must first beat a really stupid minigame.
 * 10) Enemies with projectiles are a chore to fight as their attacks constantly cancel yours, and thanks to the awful controls and pathetic range, it makes facing them an exercise in frustration.
 * 11) The water and cave sections of the stage use the same backgrounds, making them look pretty similar.
 * 12) The controls are anything but precise, especially jumping which feels like it doesn't get affected by the gravity.
 * 13) Osomatsu's attack is a pathetic slingshot with barely any range and makes the first level unfairly hard unless you get an upgrade for it.
 * 14) The game is also glitchy as a lot of players report that the game crashes many times at the last level.
 * 15) Only five lives and no continues at all, and it's very easy to lose them.
 * 16) Crappy ending that is almost insulting, it tries to be funny but with the bad guys screwing you, it ends up feeling like a bad joke.
 * 17) The game is notable for false advertisement and being downgraded during development. Originally Sega wanted to use a 4MB cartridge but due to a global level shortage they had to use a 2MB cartridge instead, which ruined the development of the game like the lack of memory prevented the developers from adding more levels and designing them with more care.

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Trivia

 * It was the first title of the system that wasn't a port or a sequel to an arcade game.
 * This game is the 4th game released on the console in Japan and the only game that was released in Christmas 1988.