Quite possibly one of my favorite early Sega arcade games. You control a gunman protecting a bank, by looking over at a set of three doors at once, shooting outlaws as soon as they pop in, making sure they aren't innocents, while also defending the place from the occasional hazards like time bombs. Very addicting, has a lot of surprisingly deep score mechanics, and can get really wild on later levels.

I'd love to see this game get re-released, but I'm sure people would get pissed off because the main BGM is Dixieland...