Logic puzzle

Binero

Balance the grid with ○ and ●

Binero is a free online logic puzzle where you fill an 8×8 grid with two symbols, never three alike in a row and an equal count of each per row and column, with a new grid every day.

Duration: 4–6 min
Difficulty: Medium to hard
Skill: Deduction
Price: Free

Play now — for free

How to play?

One grid, two symbols, three rules. Fill every cell with a ○ or a ● — the 0s and 1s of Takuzu — while respecting the row and column constraints. Logic does the rest.

Fill each empty cell with a ○ or a ●.
Never more than two identical symbols in a row.
As many ○ as ● in every row and column, and no two rows or columns alike.
Draft mode: cycle cells freely, the grid is only judged once it's full.

Why play?

Rules learned in ten seconds, depth that lasts.
No prior knowledge needed, only deduction.
Draft mode lets you test hypotheses at no cost.

Tips

Spot the pairs: two identical symbols side by side force the opposite symbol into the cells directly before and after them.
Look for gaps: when two identical symbols sit on either side of an empty cell, that cell must take the other symbol, or you would get three in a row.
Count along every line. On an 8×8 grid each row needs exactly four ○ and four ●: once one symbol reaches four, every remaining cell gets the other.
Remember that rows must be unique. If a nearly finished row mirrors a completed one, its last two cells have to go the other way round.
The grid is only checked once it is full, and every failed check costs points. Double-check rows and columns before filling the last cell.

Frequently asked questions

How do you play Binero?

Fill every empty cell with one of two symbols, ○ or ●, the equivalent of 0 and 1. Three rules apply: never three identical symbols in a row, as many ○ as ● on every row and column, and no two rows or columns alike. Pre-filled cells are locked.

Is Binero free to play?

Yes. Binero is free and runs in your browser, on desktop or mobile, with nothing to download. Today's grid can be played without an account. A free account unlocks the archive of past days, and SIWA+ (€18 a year) removes ads and adds advanced stats.

What is the difference between Binero, Takuzu and Binairo?

Essentially none: Takuzu, Binairo and Binero are names for the same binary puzzle, with the same three rules. Binero adds a daily grid shared by every player, a score out of 1000 points, a daily leaderboard and streaks of consecutive days.

Why doesn't Binero show which cells are wrong?

With only two symbols, flagging a wrong cell would give the answer away. So the grid is only checked once it is full. If it is incorrect, you know something is off but not where. A joker used at that point reveals one of the wrong cells, at the cost of some points.

Is the Binero grid harder on Sundays?

Yes. On weekdays the daily grid is a medium 8×8; on Sundays it stays 8×8 but comes with fewer pre-filled cells. Every grid has a single solution, checked by a solver before it goes live. It changes at midnight, your local time.