General outline:
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×Your top priority is to make sure each fegundo (except for maybe the last one) kills three brains if it explodes over a pit. The more fugundos there are the more difficult this is, so it's best to try to kill one or two early on in a place where it will kill three brains. You can steer them into the northern wall if you need to offset them or have them out of the way for a few turns.
It also to explode a fegundo at (24,16) then another one at (25,15) fairly early on. This helps you by not only allowing you to hit the orb freeing up a safe space on the yellow door, but also by allowing you to crash a fegundo in the area of (25,15) to give you a bit of a break.
Full spoiler. Here is where I exploded fegundos.
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×There is more than one way to go about this, but this was one way to solve it. Each number represents a specific fegundo, but the number has nothing to do with movement order or anything, I just numbered them by the order I exploded them in. Some of them explode several times because they die on a safe space. I also didn't include explosions that just served to offset things at the beginning.
I can post a demo if that still is not enough.
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Links to neat forum tools that I always have trouble finding:
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