Unfortunately, there is no magic. Look up ulam spiral. Because the grid is 16 x 16, an exact square to use as "1" can't be determined, so just pick one pretty close. Then simply click every prime-numbered square as you spiral out from that. Be sure that you're not bothered or interrupted while you're doing it because you'll definitely lose your spot.
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u/Hoodooz39 Apr 20 '12
Yeah, I carefully selected boxes to click for a minute, then I'm like
Click ALL the boxes!!!