Starcraft 2, Brutal difficulty walkthrough with commentary
Mission 24: The Gates of Hell
Bust through a large zerg base to save some NPCs, all the while enduring fairly large attacks on your base. The game creates a great atmosphere of panic and urgency, though in reality you have all day to finish the mission. There a few pockets of rescuable units and free $$ that will help a great deal. Destroy the spore launchers to slow enemy reinforcements. Ground troops will dominate this map, though you could probably win it with BCs or banshees/vikings.
Starcraft 2 Mission 24: The Gates of Hell walkthrough on Brutal (w/commentary) Part 1 of 2
Starcraft 2 Mission 24: The Gates of Hell walkthrough on Brutal (w/commentary) Part 2 of 2