J.J. & Jeff

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J.J. & Jeff
PC Engine
Hudson Soft
System(s): PC Engine, TurboGrafx-16, Virtual Console
Genre: Action

Number of players: 1
Release Date RRP Code
PC Engine
¥4,900 HC62006

$? TGX020014

Virtual Console US ? points ?
Virtual Console EU ? points ?
Virtual Console AU ? points ?


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J.J. & Jeff, known as Kato-chan Ken-chan (カトちゃんケンちゃん) in Japan, is a side-scrolling action game developed by Hudson Soft for the PC Engine and TurboGrafx-16.

In its original form, Kato-chan Ken-chan was based on the Japanese television show Kato-chan Ken-chan Gokigen TV, with hosts Ken Shimura and Cha Kato assuming the role of playable characters. The game was censored for its North American release due of the copyright and the toilet humor.


It is very similar to Adventure Island, but instead to need to get a weapon for attack the enemies, the characters can kick them.

Production credits

  • Excecutive Producer: Katsuhiro Nozawa
  • Programmer: Katsuhiro Nozawa, Kouji Kaneta, Keigo Yasuda
  • Game Planner: Mr. Ura, Miss. Megumi, And Takatsu
  • Game Designer: K.Nozawa, K.Yasuda, K.Kaneta, And T.Takatsu
  • Observer: Nandemo Enchan, Doudemo Imai, Izukomo Aoyama, Soredemo Tsuji
  • BG Designer: T.Yamamoto, Tsukasa Shindou, Taiichi Matsuda, Yutaka Satoh
  • Character Designer: T.Yamamoto, Tomomi Wajima, Moto Yamaguchi
  • Sound Effect: T.Sasagawa, T.Takimoto
  • Music Program: T.Sasagawa
  • Music: Kinoko Kunimoto
  • Special Thanks: Mr.Maruyama, Mr.Yamamura, Mr.Nakamoto, Mr.Takahashi, Mr.Tamura
  • Very Special Thanks: Cha Kato, Ken Shimura
See You Next Game
Good Bye...
Source: In-game credits (JP)

Magazine articles

Main article: J.J. & Jeff/Magazine articles.

Physical scans

PC Engine version


PC Engine, JP
KatoChanKenChan PCE JP Box Front.jpg
KatoChanKenChan PCE JP Card.jpg

TurboGrafx-16 version

TurboGrafx-16, US
JJandJeff TG16 US Box Back.jpgNospine.pngJJandJeff TG16 US Box Front.jpg
JJandJeff TG16 US Card.jpg
JJandJeff TG16 US Box Front JewelCase.jpg
Jewel Case

Technical information

ROM dump status

System Hash Size Build Date Source Comments
PC Engine
CRC32 6069C5E7
MD5 23DF0B354E83876A94E9C128A7A9EB80
SHA-1 1381C15587891083F7CDE3B1224FCC6DF45BC914
262,144 Card (JP)
PC Engine
CRC32 E01C5127
MD5 B614F91296AAED8AFABD4F03F4EE40D1
SHA-1 18AE2D9031F49E54145D83FF90DF4189C36ADEF1
262,144 Card (US)