You don't need The New Order to play this. Two-Part Mission:
Infiltrate Castle Wolfenstein to steal coordinates to General Deathshead’s compound. Wolfenstein: The Old Blood-CODEX
is a standalone prequel to Wolfenstein: The New Order , set in an alternate 1946 where the Nazis are on the verge of winning World War II. You play as B.J. Blazkowicz on a two-part mission in Bavaria to stop the Nazi war machine and uncover supernatural secrets. You don't need The New Order to play this