DWG-105.2.07
Binary #7 · Medium
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About this puzzle
A 8×8 grid with 16 of its 64 cells given (25%). Every row and column needs 4 rings and 4 dots.
Row 1 has the most givens (3); among the columns, column 2 has the most (4).
One line starts completely empty.
Where to start
The start already shows 4 doubles and 3 sandwiches, each of which forces its neighbours.
Doubles, sandwiches and counting solve this sheet from start to finish.