Starcraft 2, Brutal difficulty walkthrough with commentary
Mission 12: A Sinister Turn
In this mission, you must destroy a couple of target buildings at the end of the map, all the while fighting a constantly respawning boss enemy. This is the second Protoss mission, and the first to actually use a full base. Immortals and stalkers are key to win. Clear all of the protoss bases to keep them off your back before you make the final push. With enough immortals, Maar, the boss unit, is not a problem. You have unlimited time and tons of minerals to access, so you shouldn't have a problem as long as you make enough immortals and stalkers.
Starcraft 2 Mission 12: A Sinister Turn walkthrough on Brutal (w/commentary) Part 1 of 2
Starcraft 2 Mission 12: A Sinister Turn walkthrough on Brutal (w/commentary) Part 2 of 2