

UPDATE: We're told you can in fact destroy that building with any unit, as long as you use the attack command (as opposed to simply right-clicking). Starports no longer require Factories in order to be built. Drop off small squads of troops to guard these paths while the rest of your forces continue with the colonists. Secret! You need to do this before you go to Char, or before you complete the campaign, because you need access to the Star Map in order to access the unlocked mission. Some missions have more vespene geysers available to allow a wider variety of units. When you use the Odin's special attack on this building, it crumbles and reveals a glowing item called "Secret Documents." When you collect this, it unlocks a secret mission that plays a lot like the hero missions of Warcraft III. Following that road, you'll eventually come across an odd-looking building labeled as being under the control of "Korhal Citizens," although your mini-map indicates it is enemy-controlled. Send Odin past the first little Dominion-controlled base on the bottom right, and turn right before you reach the first communication tower. Well if you look at it and think about it, each flow chart matches the style of evolution of each race.

Had to look at how the missions were organized for each campaign (to use that as a reference for some project), and a flowchart is better than plain text.

You can either perform this during the opening few minutes, or if you're careful and can keep Odin alive, use it once your base is established. A flowchart of Starcraft 2 campaign missions. In the mission called Media Blitz, you're in control of the massive war machine Odin. If you don't want a single thing about SC2's campaign spoiled, stop reading now. Now, access to this mission takes place about 75% of the way through the game, so, although we'll do our best not to reveal anything story-wise, there are potential spoilers associated with this.
