Time
60
Points
0
Σ
Zero Sum
Highlight sequences of numbers that sum to zero. The longer the sequence, the more points it's worth. Get as many points as you can in 60 seconds.

Click a number to start the sequence. Extend the sequence by clicking on a number that is adjacent (row-wise or column-wise) to any number already in the sequence. Click outside the number grid to clear the sequence.
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Score
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