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Operation C

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Title Screen

Operation C

Also known as: Contra (JP), Probotector (EU)
Developer: Konami
Publishers: Konami (JP), Ultra Games (US), Palcom Software (EU)
Platform: Game Boy
Released in JP: January 8, 1991
Released in US: February 1991
Released in EU: May 21, 1992

SoundtestIcon.png This game has a hidden sound test.
LevelSelectIcon.png This game has a hidden level select.
RegionIcon.png This game has regional differences.
Carts.png This game has revisional differences.

Operation C is a Contra game on the Game Boy with the soundtrack of Contra and gameplay of Super C. Seriously, Konami...you didn't have to.

Sound Test


Press Up, Down, Left, Right, Start at the title screen. A plays the selected track, B stops, and Up/Down change tracks unless one is playing.

Level Select

Operation C Level Select.png

Press Up, Up, Down, Down, Left, Right, Left, Right, B, A, B, A, Start at the title screen.

This only requires a code in the US version, and original European version.

It appears normally in both Japanese versions, and the European Konami GB Collection; many very early Konami Game Boy games (such as this game, Nemesis, and TMNT: Fall of the Foot Clan) featured a level select by default with some sort of punishment for playing the game to completion by starting on a later level, possibly owing to low battery life.

However, the level select cheat only allow players to access stages 1-4, not 5. Using patch codes can change this, which shows that it is present in the game’s code, but likely dummied out.

Also the Japanese version use this cheat to add an extra lives instead. The US and the European version uses the third kind of code for this.

Debug Leftovers


Use the Game Genie code 00A-EBF-C4D to re-enable the simple sprite viewer. During the game, press Start, then use A/B to replace the player's sprite with one of the assigned sprite resources. Some of them are broken, there is no validity test for it.

Version Differences

The original European version has typical Probotector sprite swaps of humans to robots. This was reverted for Konami GB Collection, despite keeping the Probotector name.

As with all Konami GB Collection games, the Japanese update added Super Game Boy support, which was replaced by Game Boy Color support in Europe.

Operation C USA GB.png Probotector EU GB.png Contra JPN SGB.png Probotector EU GBC.png

Regional Differences

To do:
Probotector graphic comparisons.

9 Lives Code

The codes to start with 9 lives in each version of the game are different, and are as follows:

  • US/Europe: Up, Up, Up, Up, Down, Down, Down, Down, Left, Left, Left, Left, Start
  • Japan: Up, Up, Down, Down, Left, Right, Left, Right, B, A, B, A, Start (the US/Europe Level Select code; see above).
(Source: GameFAQs)