Free printable · Answer key included
Printable 8x8 Binary Sudoku Puzzles (Hard), Pack 4
Eight-by-eight binary puzzles give the signs more room to interact, and the equal-count rule starts to do real work. A satisfying step up once the six-by-six grids feel easy.
Pack 4 of 5 has four binary puzzles with an answer key on the second page. Each grid has 14 to 19 starting digits.
8x8 Binary Sudoku Puzzles (Hard) · Pack 4
logicpuzzles.ca/printable/binary-sudoku-plus/hard-8x8/pack-4
Puzzle 1 · #258
xx
0
xx
x
1
1
0x
0
0
x
1
x
0
1
0
x
0
0
0
x
1
1
1
Puzzle 2 · #337
1
=
x
x
0
1
1
0
0
0
=
1
=
1
x
x
x
1
1
1
x
0
0
0
0
0
x
0
0
Puzzle 3 · #242
0
1
1x
x
1
x
0
0
x
1
xx
x
0
0
=
0
=
0
1
1
x
0
0
Puzzle 4 · #355
0
0
0
0x
x
1
1
x
1
x
=
0
0
x
1
1
=
=
0
x
x
0
1
Answers: 8x8 Binary Sudoku Puzzles (Hard) · Pack 4
logicpuzzles.ca/printable/binary-sudoku-plus/hard-8x8/pack-4
Puzzle 1
0xx
1
0
0xx
1x
0
1
1
1
1
0
1
0x
0
1
0
0
0
1x
0
1
1
0
1
1
1
0x
0
1
0
1
0
1
0
1
1x
0
1
0
0
0
0
1
0
1
1
0
1
0
1
0x
1
0
0
1
1
1
0
1
1
0
1
0
0
Puzzle 2
1
1=
0x
1
0
1x
0
0
0
1
1
0
1
1
0
0
1
0
0
1
0
0
1=
1
1
0=
0
1
1x
0
0
1
0x
1
1
0
0x
1
1
0
1
0
1
0
1
1x
0
0
0
1
0
1
0
0
1
1
0
0
1x
0
1
0
1
1
Puzzle 3
0
0
1
1
0
0
1
1
0
1
0
0
1x
0x
1
1
1x
0
1
1
0
1
0
0
0
1x
0
0
1
1
0
1
1
1
0
0
1xx
0
1x
0
1
0
1=
1
0
1=
0
0
0
0
1
1
0
1
0
1
1
1
0
0x
1
0
1
0
Puzzle 4
1
1
0
1
0
0
1
0
1
0
0x
1
0x
0
1
1
0x
1
1x
0
1
1
0=
0
0
1
0
0x
1
1
0
1
1
0
1
1
0
0
1
0
0
1
1
0
1
1
0=
0
1
0=
0
1x
0x
1
0
1
0
0
1
0
1
0
1
1
How to solve
- Zeros and ones: Fill every square with a 0 or a 1.
- No three in a row: Never put three 0s or three 1s next to each other in a row or column.
- Balance: Every row and column holds the same number of 0s and 1s, and no two rows or two columns are the same.
- Signs: An = between two squares means they match; an x means they differ.
Free to print and copy for home, classroom and library use. Every puzzle has one answer you can reach by logic alone.