Fill every square of the 8×8 grid with a 0 or a 1.

The rules

• No more than two of the same digit next to each other in a row or column. So 0 0 0 and 1 1 1 are not allowed.
• Every row and every column has four 0s and four 1s.
• No two rows are exactly the same, and no two columns are exactly the same.
• There is only one correct answer.

How to play

• Tap an empty square once for 0, twice for 1, and a third time to clear it. Solid squares are given and can’t change.
• A red outline marks three in a row, or a line with too many of one digit.
• Fill the grid correctly to earn today’s green check.

Tip: two matching digits side by side must have the other digit on both ends, and a gap between two matching digits must be the other digit.