In this mission you are introduced to the Brood Queen.
Brood Queens have a heal which is autocast on low health targets and the ability to expand creep through creep tumors. Once a creep tumor is down you can click on the creep tumor to spawn a creep tumor from a creep tumor (further expanding your creep).
The autocast heal and the creep expansion are key to the strategy I deploy on this mission.
Note that Kerrigan’s hard hitting ability (Q) out ranges bunkers. One shot from this ability will make a bunker burn and once it starts burning it will inevitably be destroyed.
Open the map by destroying the bunker to the northeast, east, and the two bunkers directly north. Each only needs one shot and they will burn and grant you four easy kills towards your 15 required building kills for the achievement First Strike. While you are at the eastern base you can snag two 100 crystal caches.
At home make sure you are non-stop building drones and throw down a second hatchery for double production. You will want to cap off one vespene geyser full of drones and all of your minerals full. When you get 200 minerals (after building your extra hatch) lay down your spawning pool and begin churning out brood queens.
The first wave will arrive and it’s a big one, more marines than you can currently handle. To deal with this lift them up when they are in range of your spine crawler. The spine crawler, your four zerglings and Kerrigan should be enough to deal with this.
After this you will be relying on Kerrigan, brood queens, and spine crawlers for defense using roughly the same tactic.
You will want to be nonstop pumping out brood queens from the hatcheries at all times. It is worthwhile to get the +1 ranged attack upgrade from the evolution chamber if you have the gas to spare.
With your queens place creep tumors and slowly start spreading your creep to the north and to the east. This will grant you greatly increased mobility, a key to defending and attacking from two fronts.
Once you are at about 8-10 queens you should attack the eastern base. It has a lot of marines and a tank guarding it. Make sure Kerrigan nukes down the tank fast.
The goal for this mission will be not to lose queens. When queens are low on health you can quickly click them and hit B for burrow or move them to the back. By doing this you will keep these very important aggressive caster units alive.
As soon as you free the zerglings/queens from this eastern base immediately run back to your base to defend whatever is coming your way.
Next with your new giant army you are going to march forward and get the lings/queens from the north. Note there are two crystal caches here for you. This one is much easier. Just lift up the enemies and they will die, focus down flamebats first to save some zerglings.
Rush home again. You should try and clear out terran units to the northeast that are blocking your creep. Kill them and expand your creep even further towards the northern base.
For some extra building kills you can have Kerrigan snipe out the bunkers at the eastern base, but it’s not necessary.
The primary at this point is to use her Q ability on the bunker at the northern base on the eastern flank (still following me?). Letting it burn will give you a huge advantage.
Back at home make a lot of spine crawlers 5-6 are good, an extra 3-4 at the north is great as well.
Once your creep is in range of the enemy unis march your spine crawlers forward and plant them on top of the enemy (this is called a spine crawler rush). As soon as your spine crawlers start planting hit A+move with your whole army forward and start owning the enemy. Make sure to lift up those thors they can be quite nasty. Q move thors if you have it up.
Continue to expand your creep as you push and make sure to move your spine crawlers up if they are idle.
The computer will push your northern flank and you will have to send a few queens to defend it.
Don’t lose too many queens on this push. You will need to destroy the entire eastern side of this northern base to get your building kill count, note that building extensions count as individual buildings. Once the spine crawlers are in range of them it will be very hard for the enemy to field infantry to deal with this.
It will be tight, make sure to focus fire down buildings with your army. You can sack your main base freely as long as you build a hatchery in a sneaky location.
If you get down all of these buildings (that is your queen count is high enough) you will have the achievement. You will also have Zerg Save the Queen for rescuing all those queens.
After this take the remainder of your army plus the reinforcements sent to you and march forward.
To make the push less awkward have Kerrigan snipe out the bunkers with her Q ability. Now you can simply march in and kill the cannon. the brood mother will show up to lend a hand… but your forces are more than enough for this.
Congratulations on getting hard achievements on Brutal!