Puzzles2 min read

How to play Binary

Fill a grid with 0s and 1s. Never put three of the same digit next to each other, and give every row and column as many 0s as 1s.

Goal

Fill every empty cell with 0 or 1 so the three rules hold.

Rule 1: never three 0s or three 1s side by side in a row or column.
Rule 2: every row and every column has the same number of 0s and 1s.
Rule 3: no two rows are the same, and no two columns are the same.
Tap an empty cell once for 0, twice for 1, three times to clear it. Bold digits are given.
A cell that breaks a rule turns red. The puzzle is solved when the grid is full and every rule holds.

In the row 0 0 _ 1 _ 1, the first gap must be 1 (otherwise there would be three 0s) and the second gap must be 0.

Two of the same digit side by side means the cells at both ends must be the other digit.
A gap between two of the same digit must be the other digit.
When a line already has all its 0s, the rest of it is 1s (and the other way round).
On Easy and Medium, a hint fills in one cell.

Every correct answer is worth 100 points, scaled by difficulty (Easy ×0.8, Medium ×1, Hard ×1.3, Expert ×1.6).
Answering within 3 seconds adds a 25-point speed bonus.
Each answer in a row adds a 15-point streak bonus, up to 10 in a row.
Using a hint halves the points for that answer and skips the bonuses. Hints are only available on Easy and Medium.
Your score, streak and achievements are saved to your account when the game ends.

Classic

A fixed number of rounds, then a results screen.

Endless

Keep playing until you press Quit.

Time Attack

Fit in as many rounds as you can before the clock runs out.

Survival

Play until you run out of lives or make the game-ending mistake.