Originally released in 1997, Shadow Warrior Classic ran on the Build engine, which is the same engine that powered Duke Nukem 3D. It featured mutants, Yakuza, and a very stereotypical lead character named Lo Wang.
GOG is giving away the complete version which contains the main game, manual, MP3 soundtrack and FLAC soundtrack. No official word has been revealed on how long the promotion will last, but it’s safe to say it will end when Shadow Warrior 2 releases.
In case you were wondering if the game still holds up, Totalbiscuit explains how the original Shadow Warrior is still a better single-player, FPS compared to today’s standards.