Operation C

This needs some investigation. Discuss ideas and findings on the talk page. Specifically: Investigate possible remnant of game loop difficulty, similar to NES Contra (dormant turret in first stage becomes activated after first pass through the game).

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#

Sprite Viewer#

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.

Change Player Weapon#

In the US game at location 0X0BBF, there is unused code to allow the player to change their weapon when the player presses a combination of Start+Select and either Right, Up, Down, A, or B.

Version Differences#

The original European version has typical Probotector sprite swaps of humans to robots. This doesn't apply to Konami GB Collection, which is actually the Japanese version with only the title screen being from the Probotector release.

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 GB	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).