A tool that suggests unique console and handheld games: titles that
debuted on one system, where same-day launches on several systems count and anything
released on PC or in arcades first does not.
Stranded: never officially released anywhere else. Emulation and
backward compatibility do not count, only a build shipped for another system.
Ported: debuted here, then released on at least one other system
later. "Also on" lists where and when.
Sim-ship: launched the same day on more than one system. It is
listed under each of them.