Shadow Warrior is a first-person shooter video game developed by 3D Realms and published by GT Interactive Software. The shareware version was released for the PC on May 13, 1997, while the full version was released on September 12, 1997. Shadow Warrior was developed using Ken Silverman's Build engine and improved on 3D Realms' previous Build engine game, Duke Nukem 3D. Mark Adams ported Shadow Warrior to Mac OS in August 1997.