Game data disk designed by Scott Bennie, Vincent DeNardo, Brian Fargo, Bill Fisher and Bryon Garrabrant.
 Requires the original CASTLES
 CASTLES: THE NORTHERN CAMPAIGN allows players to create a new 3-disk set that replaces the original game and features:
- new conquests and graphics
- a more extensive commodities market (e.g. buy & sell grain and other commodities)
- more troop and combat options (including new features such as vikings, enemy archers, enemy wave attacks and reserves; troop training to increase military efficiency; and more realistic combat capabilities for enemies)
- new plot lines and messenger screens