The following report compares gadgets using the SERCount Rating (base on the result count from the search engine). Note: due to some search engine quota, not all result is available yet.
Play as any of the legendary religious orders - the Knights Templars, Knights of St John, The Order of Calatrava and the Order of Santiago
Fight in the Crusades to earn rewards from the Pope, defend against the Mongols and make deals with the feudal lords and bishops that rule the various provinces
Even plays games that were saved & converted to Europa Universalis II -- for gameplay that lasts through the centuries