Koko Adventure is a South Korean unlicensed game. An American release titled Buzz and Waldog was planned but canceled for unknown reasons. It has a lot of assets stolen from other games which isn't too common for pirates.

The game itself is... underwhelming. For each level, you have to collect a certain amount of keys under a restrictive time limit. In defense, the game has solid graphics, music, and gameplay considering that it's a pirate.

This patch hacks the Buzz & Waldog prototype so it no longer uses its unique mapper #156. Instead it uses mapper #118, which is a variation of mapper #4 the Nintendo MMC-3. The MMC-3 is the most common mapper making this hack ideal for building cartridges, using the PowerPAK, or just using an emulator that doesn't support this game's unique mapper. It was a quick hack and I have not fully tested it by playing through the entire game. But shouldn't have any problems. Thanks to the NEStopia's source code for mapper #156 register information.

If you want to build a cartridge you must use TKSROM or modify another MMC3 board that supports 128Kb PRGROM, 128Kb CHRROM, and 8Kb WRAM (aka PRGRAM). You must modify it to 1-screen mirroring.

For the PowerPAK or an emulator that doesn't support the mapper #156 just patch and play. Some emulators might not recognize mapper #118 though but modern ones and the PowerPAK do recognize it.

Buzz & Waldog (USA) (Unl) (Proto).nes
CRC32: 7D0C2440
MD5: DA3E51B97DFC3F7582E8D2F0E04E3055
SHA-1: 78888FD1BF3A9EB9CCD0C0DF73528B537F82CA0A
SHA-256: 03B37D1CB0BB822DB580E1C1BD38F9B997F399620D6EABACA6B6BB40E9EE9583