Swarm Assault Level 73 - The Journey

Fairly easy level. The key is to remember this one point - there is a point where the cannon can safely attack a spider colony (in the perpendicular bisector of the 2 spider-colony-turrents). Don't give the colony as target to the cannon or it may go a bit too close.. just keep moving the cannon closer to the spider colony along the perpendicular bisector until it starts attacking the colony.. It will take quite some time to bring down the colony though with this approach. If you position very carefully, you can position 2 cannons side-by-side and both be in safe zone (but it may depend on there being no obstacles in the landscape also).
So, I marked the ninjas as Ctrl+1 and brought all my units safely down to the point in the 2nd diagram.. and I placed one cannon in safe-attack position.. only, it would start attacking the black widows first, which would quickly run at it to kill, but I had the scorpions stand guard and kill off incomings.

At a point, I was able to use both cannons for attack, thought this was not necessary. Anyway, once I got the spider colony, the game was won. The scorpion colony only produces savages (and hence no real threat). I let the colony heal, cleared up the the whole area below of neutrals using the 3 ninjas. I got couple of snipers to help with the clean up, and started producing missiles. The missiles brought down the scorpion colony, then the neutral spider colony.. The rest is just carnage on the neutrals.

Swarm Assault Level 75 - Beetles vs Ants

Fairly easy level. Out of the 4 beetle colonies, the 2 on the bottom-right were easiest to defend, and so I decided to focus on those.. I started cannon production in these.. and the other 2 (top and center), I just let them defend themselves using ladybugs. The cannons let me easily take over the ant colony in between the 2 beetle colonies. Then I started expanding both up and down from there. I had lost the top beetle colony to the ants, but the center colony was thriving and well protected by the ladybugs by now.. So I started cannon production there too.. I expanded up from there too.. And went after the Northern colonies and re-occupied the top beetle colony too (after killing off incoming waves of attackers etc). The rest was straight-forward. Keep expanding.. not much else to it.

Swarm Assault Level 77 - Ant Warfare

Not a very tough lever... Though I was quite intimidated by the opponents' colonies - 2 spiders and 1 wasp each. But the good thing is there are 2 team (they would later fight each other, giving me a gap), and there's enough distance to, at least initially, use some sentries away from the base colonies to tackle incoming spiders.
When it came to attack, my first plan was to go for one of the wasp colonies.. especially considering there was a point to the exact East of the wasp colony where a bazooka could just stand and safely attack. But this never quite worked out well for me. For one, even though I brought a bunch of bazookas, most of them got killed by the quick wasp turret (the sonics had flown off when I was attacking) before any damage was done and the single safe bazooka was taking quite a long time bringing down the colony health. But the final few bars were taking too long, so I brought in one more group and barely finished off the colony.. brought down some bull ants to collect seeds. But, quickly the colony was brought down by neighboring missiles from both sides. This seemed futile as, by now, half my ant colonies were gone too.. And I was nowhere close to getting a spider colony.

So I decided the right approach had to be one where I exploit the initial flurry of units I will have from my many ant colonies and build up an army big enough to directly attack the spider colony. After couple of tries, I realized that it was cheaper to have a bunch of bull ants in the front of the attack wave (they're produced fast and can be the turret-fodder while attacking). The important thing is to Not end up coming in in a line and to form a wall of attack. I brought the ants from below the bottom-right ant colony towards the spider colony; stopped outside the range of the turrets and led them tangentially around the spider colony and then brought them all in to attack the spider colony - sacrificing the bull ants in favor of minimizing attack on the bazookas (attack wave front pic below). I brought down the colony and had enough surviving bazookas to pick up the seeds and constantly defend against the sonic attacks, giving my spider colony time to heal. In the top, at least 2 of my ant colonies were mine and healthy - they were producing bull ants now to overwhelm with numbers. Greens and Yellows were fighting over the other ant colonies. I produced a sniper with bare minimum health and stopped production to let it heal. The sniper was used to kill off sonics before they had a chance to come to attack; and when free, attack the wasp colony too.. Once the spider health was in the yellows, I produced 2 more snipers before letting it rest again.. The snipers brought down the wasp colony.. Ants and snipers picked up the seeds.. Snipers focused on killing off incoming missile attacks. I started producing missiles of my own.. Brought in the missile in some time took over the other spider colony also.. I let it rest.. Now I had a few missiles around the original spider colony.. I led them up through my ant colonies and started attacking the Yellow spider colony.. I had started assault production also by now.. I picked up the seeds using assaults and bull ants and switched the missiles to attacking the Yellow wasp colony.. And then the other yellow spider colony.. It was all pretty easy from this point on.

 

Swarm Assault Level 79 - Scorpions vs Beetles

Fairly easy level.. similar to "Level 75 - Beetles vs Ants". We have 2 scorpion colonies. I started producing ninjas in both. For the central colony, I parked the Savage scorpions above and towards the left to fend off any incoming attackers; I was going to focus on the North Eastern colony initially. I took a couple of ninjas to attack the top-right beetle colony - Ninjas vs Beetle colony. Beetle colony turret gun is placed towards the North (top part of the screen) of the colony, and hence has slightly higher range in the 90 degree range from above around the central vertical. Hence, ninjas seem to be able to attack a beetle colony safely in the 270 degree range, all except the top 90 degree range. The unsafe range is - 45 degree to the top-left to 45 degree to the top-right.

If the beetle colony is producing ladybugs, then the ninjas can safely attack, as ninjas can out-range the ladybugs and kill off any within the attacking range. But if the colony is producing cannons, then they would attack the ninjas. So, in such cases, I sent out 3-4 savages after the cannons to distract them while the ninjas killed off the cannons (if possible) and brought down the colony. I let the savages pick up the pieces of the popped colony and led the ninjas to the beetle colony to the top-left of the scorpion colony. I had to bring in more ninjas to finish it off as there were more cannons there. Now, it wasn't so easy to attack any more colonies from the North scorpion colony. So, i took 3-4 ninjas from the center colony, and went on attacking several beetle colonies from below and conquering them. Produced ladybugs from some of the occupied beetle colonies.
From now on, you can mostly overwhelm beetle colonies and their cannons with ninjas and ladybugs.. Or you could produce cannons and take down the beetle colonies from a distance.

Swarm Assault Level 72 - Natural Selection

Not a very tough level.. though I was quite intimidated by this at first.. But then I realized that the only way to proceed was to take over the 3 yellow spider colonies. This is how I went about it.
I produced cannons in the top 3 colonies closest to the spiders. And ladybugs in the bottom 3 colonies closest to the scorpions - so as to delay the progress of the incoming scorpion front while I could focus on acquiring the spider colonies. I placed cannons towards both sides of the land bridge that separates the spider colonies from the rest. And targeted incoming attackers. And I placed one cannon towards the middle of the land bridge just close enough so that it would start attacking the spider colony safely. I let him bring down the colony slowly while killing off attacking spiders. Also, I had switched to ladybug production in at least one of the top colonies to get more units.
Once the closest spider colony collapsed, I brought up all the units ans collected seeds and killed off incoming attackers.. Then the spiders popped it again.. the cycle went on for a bit.. but I preferred to focus on killing rather than occupying. Once I had more units and I noticed that the other spider colonies healths were low enough, I attacked them too.. Finished them all off.. Most of my units died off.. But one of the cannons was in safe zone and finished the job. And I brought in more ladybugs to help collect all seeds and kill off lingering lone-spiders. Now, the scorpions were closing in from the South, but at least I had the 3 spider colonies.. I collected all the lady bugs I had and went down and started a  resistance to the advancing scorpions.. killing them off fast. Then I started producing snipers from the healthy spider colonies. Expanded my boarders.. Kept pushing the boundary South, till I mostly had all the beetle colonies.. I produced ladybugs from healthy beetle colonies.. and had plenty of snipers already produced.. Now, I could just bring down the snipers and ladybugs and storm the scorpions from South-West. One at a time.. I didn't even need missile spiders to finish off all the scorpions.

Swarm Assault Level 67 - Forbidden Planet

This was a highly intimidating level for me. I was reluctant to play it for quite a while. Till now, I was so reliant on spider colonies to win. But now, I was up against 5 Red spider colonies and 2 Red wasp colonies, all with zeros spiders. I had 3 Blue scorpion colonies, 1 beetle colony, and 2 ant colonies that were too close to the enemy gates.
I started ninja production in all 3 scorpion colonies; ladybugs in beetle colony; bull ants in the 2 ant colonies.

Swarm Assault Level 63 - Arena

Not a tough level. Get the right strategy and you win.
You have just the ant colony while your enemies have spider, scorpion and wasp. Manage to salvabe as may troopers as you can in the initial melee.. Pull them a little close to the protection of the base colony.. maybe not too much because they can't attack while walking. Anyway, make sure you've saved both missiles and 1-2 snipers. Keep them safe from attack initially, and then from neutrals (bombers and black ants).
Now, start production on bull ants, you don't need bazookas as enemies and their colonies are too superior for bazookas' range. I remember in my early attempts, I tried attacking the wasp colony and taking it down successfully, but the problem was that by now, the spiders had occupied the scorpion colony and the Reds had become not too powerful. So the right strategy seemed to be to go for the spider colony. When I tried to do it with the 2 missiles, they quickly got killed by the snipers (trying to kill off snipers didn't work as missile attacks are not continuous and by the time the missiles hit them, my missiles were down. So we have wait.. while the ant colony base gets overrun by bull ants fending off black ants. Once there are enough spiders, they'll start marching to the scorpion colony attack. I had by now, marked the missiles by Ctrl+1, so I could quickly select them by pressing 1. So as soon as the spiders moved to attack mode, I moved a bunch of my forces half way to the spider colony; selected the marked missiles using "Press 1" and got the 2 to attack the spider colony. The snipers coming out simply went up to the scorpion colony attack. The spider colony popped; I swarmed in with my forces and occupied it. By now, the snipers were coming back from successfully conquering the scorpion colony; and were getting slaughtered by my forces waiting back home.Now, I used the same missiles (with other forces standing guard) to quickly bring down the low-health scorpion colony. And the rest was too easy.