I play Wolfenstein 3D all the time on my Mac, works great.Wolfenstein 3D was a spiritual successor to Castle Wolfenstein.
Return to Castle Wolfenstein was a sequel/remake of Wolfenstein 3D.
Return to Castle Wolfenstein is available for the Mac.
http://3drealms.stores.yahoo.net/wolfenstein3d.htmlYou have to have the original files though and run it in DosBox (which is free).