Return to Castle Wolfenstein: Tides of War is an updated re-release for the Xbox based on the original PC version Return to Castle Wolfenstein. Next to the full, original singleplayer campaign, there are 7 new prologue levels that show how B.J. and Agent One first met and how they got captured and imprisoned at Wolfenstein Castle. There is also a secret bonus awarded at the end of every level when every secret area has been found.