Operation C

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 This game has a hidden sound test. This game has a hidden level select. This game has regional differences. 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

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 the 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.

US/JP	EU GB	JP SGB	EU GBC

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)