Hint: Mission 9
This mission puts you up against a new type of enemy, the Walking Arms or "Hectors". The Walking Arms will start out at a decent distance from the shore, but will be constantly moving in and raining down destruction on the group of troops gathered there.

To make matters worse, a huge group of gunships will need to be taken care of as well. The thing to note about Walking Arms is that their height makes them very unstable and rapid firing weapons can easily throw off their aim. As a result, closing the distance with an assault rifle, preferably an RA model, is easy.

As for the gunships, there are two viable methods for taking them out while focusing on the more dangerous Walking Arms. The first is to use a missile launcher with a fast missile (MLRAs or Emeralds work well) and fire off a couple shots at the swarm of Gunships while focusing on the Walking Arms. This will let you take them out every time you get a spare moment and cut down on the amount of enemies firing upon your troops.

The other method is to use groups of sentry guns, preferably fast firing ones such as the ZERA. This will let you concentrate on the Walking Arms while the guns take on the Gunships.

Hint: Mission 33
The giant quadruped fortress is tough and it’s still not time to take it out, despite what HQ wants. Make sure you have a sniper rifle or rocket launcher to take out the UFO carriers in this mission, and back it up with whatever weapon you like to take out the ants and Gunships that will be attacking during the onslaught. A good shotgun will get the job done. To start, completely ignore your troops. They are ready to rush into combat and die a valorous death. Let the A.I. do that.

You need to move to the left of the starting point until you are nearly at the western edge of the stage. From here, take down any of the enemies that are coming in and attack the first of the carriers. Attacking the carrier will make any enemies it has deployed come in at you, but you won't have to deal with the enemies that are under the other carrier.

At some point, the fortress will start firing its cannons and moving. Make sure you stay far away from it, moving north or south as needed to keep your distance. As long as you do so, the lasers will never come close enough to be any real threat, leaving you to simply take out the couple of UFO carriers and their attendant enemies. Let the fortress go its own way and wait for the next mission.

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