Mission 13 is not a difficult level – the green tanks that made their debut in Mission 12 are taking a day off – but it’s no picnic either, due to the fact that you have 3 yellow tanks (for which I expressed my distaste here) and 3 teal ones (which become a real threat only because you’re distracted by the yellow ones).
There are several possible strategies to tackle this level, which is another way of saying they aren’t vital for survival. But here’s one that can be used to beat the level systematically:
Strategy: Stay on the left side, be constantly moving up and down (where possible) to evade missiles from the teal tanks, and take out the yellow tanks first. Most likely, the teal tanks will stay on the right side.
Tactic: Start out like the video above by fanning and rebounding off the lower barricades to attempt taking out the middle yellow tank, and immediately run so as to evade the green tanks’ missiles. However, unlike the video above, don’t find yourself tucked into the lower left corner having to watch out for rounds travelling along the bottom of the screen, partially obscured by the bottom wall – that was unwise of me but I got lucky. Then, just try to track down all the yellow tanks, and when you’re left with just the teal ones, simply use what you’ve learned about them to take them out.
Next up: Mission 14. (You’re not gonna like what you see…)