Investigate City, Expose Mole, and Military burgalizring are the only missions I'll use. Investigating city is indispensible - I must know how my rivals are getting along in their Wonders so I can beat them. Exposing Mole is important so those thieving civs don't get too much out of me. But what's weird is that while I expose all of their moles they don't do that vice versa. Nor do they sabotage production. The other civs were France, Iriquois, England, and America. Do I love burgirlizing the miliary plans. It's so cool to see all the units and discover how many units they have and where they are.