Play Binary Puzzle online
The binary puzzle is a logic puzzle that uses only the digits 0 and 1, also known as Binairo, Takuzu or Unruly. It is quick to learn, surprisingly tricky and a fresh counterpart to classic Sudoku. At Sudoku Sagax you play it on an 8x8 grid, ad-free and without forced sign-up.
What is a binary puzzle?
A binary puzzle is a square grid that gets completely filled with zeros and ones. Some cells are given and stay fixed; you fill in the rest step by step. It is pure logic: from the three basic rules every digit follows unambiguously, so you never have to guess. Just like Sudoku, each puzzle has exactly one solution.
The idea goes by many names. Internationally it is usually called Binairo or Takuzu, in English a binary puzzle, sometimes Unruly or Tohu-wa-Vohu. They all mean the same game: a grid of only 0 and 1. At Sudoku Sagax we simply call it the binary puzzle and play it on an 8x8 grid of 64 cells.
The rules, explained simply
A binary puzzle follows exactly three rules:
- Equal 0s and 1s. In the end, every row and every column holds as many zeros as ones. On the 8x8 grid that means four zeros and four ones per row and per column.
- Never three in a row. Three identical digits may never sit directly next to each other, neither horizontally nor vertically. So at most two zeros or two ones in a row are allowed.
- No duplicate lines. No two rows may be completely identical, and likewise no two columns. Every finished line is unique.
That is all. From these three rules every cell can be deduced, with no guessing and no arithmetic.
Tips and techniques to get started
A handful of recurring patterns make you fast and confident:
- Complete a pair. If two identical digits sit next to each other, for example 1 1, then a 0 must follow on each side, otherwise a forbidden triple would appear.
- Fill the gap. If there is a single gap between two identical digits, such as 1 _ 1, the other digit belongs in the middle, here a 0. Three ones in a row would not be allowed.
- Count. If a row already has four ones, all remaining cells in that row must be zeros. The balance from rule one is one of your strongest tools.
- Compare lines. If a row is almost finished and one digit would make it identical to another finished row, then the other digit has to go there.
Binary puzzles at Sudoku Sagax
You reach the binary puzzle from the home screen under "More game types". It has its own 800 levels, its own leaderboard and its own trophy for your first solved puzzle. Your Sudoku points stay separate; each mode keeps its own scoring. For a gentle start there is a tutorial level that walks you through the rules on an almost finished grid.
You play by selecting a cell and using a 0/1 keypad, just like in Sudoku. Moves that break a rule are flagged immediately, so you can work your way to the single solution step by step. Everything runs in the browser, ad-free, without trackers and with locally served fonts.
Frequently asked questions
What is a binary puzzle?
A binary puzzle is a logic puzzle on a square grid filled only with the digits 0 and 1. It is also known as Binairo, Takuzu, Unruly or Tohu-wa-Vohu. At Sudoku Sagax you play it on an 8x8 grid. Like Sudoku, there is no guessing: every digit follows logically from the rules.
What are the rules of a binary puzzle?
There are three rules: each row and each column contains an equal number of zeros and ones (on 8x8 that is four of each). No three identical digits may sit next to each other, neither horizontally nor vertically. And no two rows and no two columns may be identical.
What is the difference between Binairo, Takuzu and binary puzzle?
They are the same puzzle under different names. Binairo and Takuzu are the internationally common names, binary puzzle the descriptive English one. Unruly and Tohu-wa-Vohu also mean the same thing: a grid of only 0 and 1 with the three rules above.
Is a binary puzzle harder than Sudoku?
It is different, not necessarily harder. Instead of nine digits there are only two, but balancing zeros and ones and avoiding triples matter. Many find it easier to start because there are only two options per cell. Sudoku Sagax adds a tutorial level for a gentle start.