Free printable · Answer key included
Printable 8x8 Binary Sudoku Puzzles (Hard)
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.
This first pack has four binary puzzles with an answer key on the second page. Each grid has 13 to 15 starting digits.
8x8 Binary Sudoku Puzzles (Hard)
logicpuzzles.ca/printable/binary-sudoku-plus/hard-8x8
Puzzle 1 · #336
0x
x
0=
0x
1
x
1
1
1x
1
x
0
0x
0
=
1
x
1
Puzzle 2 · #283
1x
0=
1
0
0
x
x
x
0
=
=
x
0
1
1x
1
1
1
x
0
0
Puzzle 3 · #279
1
0
=
0
1x
1
x
0
0
x
1
0
x
0
=
1
x
1
1
x
1=
x
0
Puzzle 4 · #228
0=
0
1
x
0
1
0=
0
0
=
=
1
0
0
=
=
0
=
=
=
0
0
Answers: 8x8 Binary Sudoku Puzzles (Hard)
logicpuzzles.ca/printable/binary-sudoku-plus/hard-8x8
Puzzle 1
1
0x
0
1
0x
1
1
0
0=
1
0
0
1
0x
1
1
0
0
1
1
0
1x
0
1
1
0
1
0
1x
0
1
0
1
1x
0
0
1
1
0
0x
0
0
1
1
0
0
1
1
1=
1
0
1
0
1x
0
0
0
1
1
0
1
0
0
1
Puzzle 2
0
0
1x
0=
1
0
1
1
0
1
1
0
1
1
0
0
1
1
0
1
0
1x
0
0
1x
0x
0
1
0
0
1
1
0
1=
1=
0
1x
0
0
1
0
1
1
0
1
1x
0
0
1
0
0
1
0
1
1
0x
1
0
0
1
0
0
1
1
Puzzle 3
1
1
0
1
0
0
1
0
0=
0
1
1
0
0
1x
1
0
0
1
0
1
1
0
1
1
1x
0
0
1x
0
1
0
0
1
0
1
0
1
0
1
0
0x
1
0
1=
1
0x
1
1
0
1
1
0x
0
1
0
1
1
0
0
1=
1x
0
0
Puzzle 4
1
0=
1
1
0
0
1
0
0
0
1
1
0x
1
1
0
0
1
0
0
1
1
0
1
1
0=
0
1
0
0
1=
1
0
1=
1
0
1
1
0
0
0
0
1=
1
0
1=
1
0
1
1=
0=
0=
1
0
0
1
1
1
0
0
1
0
0
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.