Was this old Sega Master System game the very first video game cartridge ever to use the password system (at least in the US)? I have reason to believe that it is, and no one ever gives it credit for it's huge landmark. While I don't know exactly when in 1987 it was released, I bought it in April/May of that year. Metroid and Kid Icarus, the first password NES games, didn't come out until late in 1987.