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Gut, there are some free go-playing programs available, such as Gnu Go:

http://www.gnu.org/software/gnugo/beta.html

Did you also play human opponents?

Go, the board game, the Asian equivalent of chess.

HoMM II and III.

Mordor: the Depths of Dejenol, an old-school hack 'n slash.

Lands of Hyperborea, which is a brilliant mod of Dungeon Siege...