X-0

X-0 is a small Finnish freeware game for DOS, described in its own release note as traditional Finnish jätkänshakki for one or two players. Jätkänshakki, literally lumberjack's chess, is the Finnish name for the pencil-and-paper game played on squared paper in which the winner is the first to line up five marks in a row.

The release made a point of the newly added computer opponent, which meant you could also play alone; the author called it small but well made, and it asked for nothing beyond DOS and a VGA card. No release year is documented. The game survives in Finnish collections of 1990s freeware, everyday domestic software that international retro sites never catalogued. On OldGame.cz it runs straight in your browser.