Here’s a level that can be completed swiftly.  As soon as the level starts (not a second too late!), fire all 5 of your rounds successively, starting with the first aimed at the upper left brown tank, ending with the last at the lower right brown tank, with the other rounds in between.  If you’re lucky, that’s all it takes, taking out all 4 tanks in one blow.  If not, that will usually take out 2 or 3 tanks right away.

With or without this tactic, the main thing to pay attention to in this level is evading enemy fire by moving to the space in the “V” of the trajectory of enemy fire.   This is because you already start out near the corner and you don’t want to be further cornered!

This is where the rocket-propelled-shell-firing teal tanks appear.  Formidable at first sight, they are actually easily defeated.

In this level, the 2 tanks usually both fire a round at you right off the bet.  These rocket-propelled shells don’t rebound, and the trajectories of these initial shots usually form an X, crossing near you.  So start the level by moving down a little, and position yourself right under this X to avoid the shells.

Then, it is pure procedure.  Just follow the General Strategy against Teak Tanks.

Incidentally, the video above shows how not to fire fan-and-rebound rounds, which are the first 5 shots I made in this video.  You can see that the shells canceled each other out:

This mission always begins with the teal tank directly opposite you firing at you.  So I typically move up immediately.  I would stop momentarily just before crossing the upper barricade, and fan out all five rounds of shells from the upper barricade to the lower one, then move up above the upper baricade for protection.  Those five rounds will typically take out at least one of the tanks, three if you’re lucky.

For any remaining teal tanks, just apply the usual tactic for teal tanks.

In the process, watch out for rebounding shells from the innocent-looking grey tanks.  Due the wide gap between the barricades and the surrounding side walls, shells can rebound at a steep angle and reach you deep behind the barricades.   This happened at right about the middle of the above video.  Luckily, I was well on my way to the other end of the barricade.

Start the mission by fanning out all five rounds towards the teal tank directly opposite you.  In the above video, I didn’t execute this very well with a fan that is too narrow.  But still, it was wide enough to have the effect of trapping it into a corner (see General Strategy against Teal Tanks).  Whatever the case, be cautious of your own shells rebounding from the far wall!

The rest of this mission can be carried out following the General Strategy against Teal Tanks

Next:  Mission 8

This mission is engaged, if you’re not very passive, by first taking position either at the top or bottom of the left wall.  By habit I usually take the bottom first.  Sometimes, you can take out the teal tank near the lower right corner by trapping it into a corner (see General Strategy against Teal Tanks).  Unfortunately for me, I didn’t execute the trap very well (in particular, since one of my initial five rounds were canceled out by the teal tank’s rocket-propelled shell, I could have followed up with one more to increase coverage of my shells), and the teal tank had enough room in the corner to evade my shells.  And then I was hit.

From then on, it is mostly fan-and-rebounds.  See also Overall Strategy for Yellow Tanks.

Next:  Mission 9.