Return to Castle Wolfenstein
"Return to Castle Wolfenstein" received favorable reviews from critics. At Metacritic, it scores 88/100 (based on 32 reviews), and on GameRankings it scores 86.75% (based on 50 reviews). "Eurogamer"'s Tom Bramwell called "Return to Castle Wolfenstein" "a worthy addition to the stable of id Software affiliated shoot 'em ups. The single player game is average to good and takes quite a while to finish, but the game really earns its salt by shipping with a first class multiplayer element."
Wolfenstein: Enemy Territory
Wolfenstein: Enemy Territory is a free and open-source multiplayer first-person shooter video game set during World War II. It was originally planned to be released as a commercial expansion pack to "Return to Castle Wolfenstein" and later as a standalone game. However, due to problems with the single-player aspect, the multiplayer portion was released on 29 May 2003 as a freeware standalone game. In January 2004, the source code for the game logic (not the game engine) was released to the benefit of its modding community.