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Kato & Ken Detective Agency are assigned the task of locating a missing rich man, and you can choose either Kato or Ken to go on the mission. Your partner doesn't like this one bit, so he decides to make a nuisance of himself along the way. Similar to Adventure Island, you must make your way through several levels, destroying wildlife along the way, but instead of using a hammer, you have three different ways to kill them: jump on or kick them, or when they are walking on the ground, blow gas out of them.

While scrolling through the level, your vitality will decrease, but it can be restored by collecting fruit and junk food. During your travels, you will also encounter your partner doing things that shouldn't be done in public, but sometimes, he will throw stuff at you to make you lose some of your vitality. The only way that you can deal with him is by kicking him where it hurts.

Along the way, you can enter doors. Doing this will give you a hint about the level and your vitality will be increased as well. You can kick certain objects such as lamp posts, trashcans, or thin air to obtain coins, or to make hidden platforms appear. Coins can be used in slot machines that will give you extra vitality, more lives, extra coins, and more. Slot machines only appear when you enter certain doors.


J.J. & Jeff TurboGrafx-16 "Hurry up in there, Kenny, or we'll miss the start of the Super Bowl."
J.J. & Jeff TurboGrafx-16 Kato kicks his partner, Ken
J.J. & Jeff TurboGrafx-16 Title Screen (US release)
J.J. & Jeff TurboGrafx-16 Ken the lollipop man

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Alternate Titles

  • "Kato-chan Ken-chan" -- Japanese title
  • "カトちゃんケンちゃん" -- Japanese spelling

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Critic Reviews

Power Play Dec, 1988 82 out of 100 82
ASM (Aktueller Software Markt) Mar, 1989 9.6 out of 12 80
Computer and Video Games (CVG) Aug, 1988 8 out of 10 80
Electronic Gaming Monthly (EGM) May, 1990 30 out of 40 75
Defunct Games May 27, 2006 43 out of 100 43


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Version differences

Hudson Soft decided to modify the US version of the game, so it was less offensive. Examples:
  • The two main Japanese guys were replaced by Americans.
  • The urine was removed when your partner urinated near lamp posts.
  • Instead of the ability to blow gas out from your ass, gamers had the ability to spray with an aerosol can.
  • Your partner going to the toilet in the bushes was removed. Instead, your partner just stands near the bushes wearing a bear mask.

Katakis | カタキス (42051) added J.J. & Jeff (TurboGrafx-16) on Feb 09, 2005
Other platforms contributed by Guy Chapman (1997)