The MMC3 release of this game has a bug which skips Round 4 (Lorenzen's Soil) of the game. The reason is because when Round 3 (Puppy Love) was completed, it adds 1 to the level counter. However, the game's level complete logic then adds 1 to the level counter too, resulting Round 4 being skipped entirely. Later versions fixed this bug, but runs on Ka Sheng's copy protection mapper (Mapper 121).
This simple hack attempts to fix the bug on the MMC3 release of the game, so the game in its entirety can be "enjoyed" on most emulators.
