Ganbare Goemon Gaiden 2

Ganbare Goemon Gaiden 2 is an NES game by Konami that was only released in Japan.

Build Dates
At the end of the PRG ROM, an ID string lists the game version and date: MSTR910927 MSTR means it's the "master" version of the game, and the numbers are the date, so this version was compiled September 27, 1991.