A good-looking no-frills shooter. Play the Windows version if you can. And skip the intro. It’s a better way to enjoy the weirdness crescendo that makes this game so great.

From Wikipedia

Return to Castle Wolfenstein is a 2001 first-person shooter game developed by Gray Matter Studios and published by Activision. It was initially released for Microsoft Windows and subsequently for the PlayStation 2 (as Return to Castle Wolfenstein: Operation Resurrection), Xbox (as Return to Castle Wolfenstein: Tides of War), Linux, and Macintosh in the following years. The game serves as a reboot of the Wolfenstein series.