Fill the grid with 0s and 1s. Every move is logical, every board has one solution, and your progress stays on this device.
Fill the grid with 0s and 1s. Every move is logical, every board has one solution, and your progress stays on this device.
New to this 0 and 1 logic game? Learn the rules with a 6×6 example, follow your first moves, and choose a puzzle that suits you.
A binary puzzle is a logic game with just two numbers: 0 and 1. Fill every empty square. The numbers already on the board are clues; they stay fixed. You win when the whole grid follows the three rules below.
No arithmetic or binary-code knowledge needed. Just look for where a 0 or a 1 must go.
Start with a 6×6 puzzleChoose Easy on the puzzle page. The daily puzzle above is a larger 14×14 challenge.
Click or tap an empty cell: once for 0, again for 1, and again to clear it. On a keyboard, move with the arrow keys and type 0 or 1; Backspace clears the cell. Use Undo to take back a move.
Check every row and every column. Diagonals do not count.
In a 6×6 puzzle, each row needs three 0s and three 1s. Each column needs three of each, too. On an 8×8 board, it is four of each.
Two 0s or two 1s side by side are fine. 000 and 111 are not allowed, either across a row or down a column. The numbers do not have to alternate.
No two complete rows can have exactly the same pattern. The same goes for two complete columns. At least one position must differ.
A row may match a column. Compare rows with rows, and columns with columns.
Start with a blank where only one number can work. Here are three things to look for.
A third 0 would make 000, so the blank must be 1. This works before a pair too: an empty cell next to 11 must be 0.
Putting 1 in the middle would make 111. Use 0 instead. The reverse works too: 0, blank, 0 needs a 1 in the gap.
This 6-cell row already has three 0s. Its last blank must be 1. Once a row or column has all its 1s, fill the remaining blanks with 0s.
Use the pair rule first, then count the 0s. What goes in the two blanks?
The finished row is 0 0 1 1 0 1. Now check the columns that cross your new numbers.
Stuck? Look down the columns as well as across the rows, then compare almost-finished rows or columns. Hint explains the next move; Check highlights broken rules. After each number you add, look again—one answer can reveal another.
All five sizes are free to play. Start with a 6×6 binary puzzle and select Easy. Move up when you can explain why each number belongs.
Size and difficulty are separate. A bigger board has more cells; Easy, Medium, Hard and Very hard change the difficulty within each size. Try 8×8 on Easy before raising the difficulty.
More binary puzzle tipsHelp with tricky moves, daily puzzles, saved progress, and the names you may know this game by.
Explore solving strategiesUse a hint before making a blind guess. Every puzzle here is checked for a unique solution. Select Hint to read the reasoning for a suggested move, then decide whether to place it yourself or use the Place button. On hard binary puzzles, ruling out a possibility because it leads to a contradiction can be the next logical step.
No. Check finds rule conflicts in the current grid; it does not compare every entry with the final solution. A wrong number may look harmless until later moves expose it. Red cells show which entries belong to a conflict, not that every highlighted cell is wrong. Review your editable entries before changing anything; fixed clues cannot be changed.
Size and difficulty are separate choices. A 14x14 grid has more cells to track, but a smaller Hard puzzle can demand more involved deductions than a larger Easy one. To practise tougher binary puzzle strategies, keep the size familiar and raise the difficulty first. Increase the grid size when you want a longer solve.
A new daily binary puzzle arrives at midnight GMT (00:00 UTC), which may be a different time in your location. Everyone gets the same dated 14x14 challenge. After finishing it, visit a size page for more puzzles and choose your own difficulty; you do not have to wait until tomorrow to play again.
Practice progress and elapsed time are saved in the History page when local storage is available. Open History and choose Continue to resume a specific board; opening a size page always starts a new game. Your Daily streak is also stored locally. Progress does not sync between phones, computers, or browsers, and clearing site data or ending a private-browsing session can remove it.
Yes. The daily game and the 6x6, 8x8, 10x10, 12x12, and 14x14 puzzles are free to play, including the available difficulty levels and hints. Open the site in a phone, tablet, or desktop browser; no account, payment, or app download is needed.
Use Print below the board to open a paper-friendly puzzle sheet. It includes the original clues, so your on-screen entries will not spoil a fresh paper solve. Choose a printer, or Save as PDF if your browser or device offers that option. You can then solve the printed binary puzzle away from the screen.
These names commonly refer to the same binary logic puzzle family. A Takuzu, Binairo, or Binero guide will usually teach techniques you can use here, even if its grid uses black and white circles instead of 0s and 1s. Check the rules of the particular version you are playing, since variants can add or change constraints.
Yes. Q42's 0h h1 uses two tile colors, while classic Tic-Tac-Logic and Binoxxo use Xs and Os. The familiar balance, adjacency, and line-uniqueness deductions transfer to this 0 and 1 logic game: mentally map one symbol or color to 0 and the other to 1. Controls, difficulty labels, and daily puzzles can differ between versions.