OK, it's either two blasters of the same color chained together in the same move, or possibly two blasters of the same color and pointing the same direction chained together, This is different from using one blaster to set off a second separated from the first - they have to be contiguous.

On this level the goals require to get 3 "row blasters with a plus." Does anyone know what this means? I tried setting off two row blasters in the same move, but that wasn't it. I tried setting off a row blaster on the same move that I made a new one. That didn't work. I'm stymied.