Play
0:00
Row 1 target , now
Row 2 target , now
Row 3 target , now
Row 4 target , now
Row 5 target , now
Column 1 target , now
Column 2 target , now
Column 3 target , now
Column 4 target , now
Column 5 target , now
Switch bits on until every row and column matches its target. The small number is your sum.