Castle and Ruins is mostly game rule independent and a real treasure if you want to fill your campaign world with an economic setting where castles are actually produced and fits with the overall setting. In far to many game worlds you can find castles that exist in locations that seem totally incapable of producing such architectural effort. The review gets 5/5, but if you are users of another gaming system 4/5 might be more appropriate since the spells are rather tied to the Rolemaster rules.