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Corners count. You need exactly 3 items of your current level or above, which produce 3 different surge assets, adjacent to the core (and the ones from the drop count, if high enough level; otherwise surge them or ignore them, as you wish). Upgrade the three assets, if necessary (and don't have more than three). Click on the core and you'll (finally) see an upgrade button (and it will tell you how much it costs).
Upgrade and every asset touching it disappears (a 9-square section, on mine, since the core landed in the middle). Then surges of it count for more of every asset (but beware of not upgrading energy first before using).
As for choices for surges - use energy first, then build population.
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