Wai Wai World 2

Build Dates
An ID string listing the build version and date can be found at the end of the PRG ROM: MSTR901023 A similar ID can be found in many other Konami games.

"MSTR" means it's the "master" version of the game, and the numbers represent the date. So, this build was compiled on October 23, 1990.

Anti-Piracy
As most games by Konami made after 1991 year, this game contains some simple copy protection, it checks for "&copy;" symbol presence in PPU RAM at the title screen. If checking fails, then game enables "HARD" difficult mode by default from the first stage.