Games like LinkedIn Tango: unlimited binary puzzles

LinkedIn’s Tango fills a 6×6 grid with suns and moons: equal numbers of each in every row and column, never three in a row, and = / ✕ signs between some cells telling you whether they match. One puzzle a day.

What kind of puzzle Tango is

Tango is a binary puzzle, known for years as Takuzu or Binairo (and “Binary Sudoku” in some apps). The classic version uses 0 and 1; LinkedIn added the = and ✕ clues, which make small grids solvable with fewer givens. Any two symbols work: suns and moons, circles and squares, black and white.

The three deductions that solve any binary puzzle

1. Two in a row cap the ends. ○ ○ _ means the next cell must be the other symbol, and so must the cell before the pair.
2. A gap between twins. ○ _ ○ forces the middle cell to be the other symbol; otherwise you would have three in a row.
3. Counting. In a 6×6 row, once you have three of one symbol, the rest are the other. On a nearly full line this alone finishes it.

With = and ✕ clues, apply them the moment one side is known: = copies the symbol, ✕ flips it. Chains of clues often decide a whole pair at once.

Play unlimited Tango-style puzzles

Duo is DailyLogic’s binary puzzle. Same rules: equal counts, no three in a row, = and ✕ clues. Differences:

• Unlimited mode in 6×6, 8×8 and 10×10: Duo Unlimited. Larger grids are noticeably harder because counting spreads over more cells.
• Live rule check: any cell that breaks a rule turns red, so you always know where the mistake is.
• Daily puzzle with a leaderboard and a share result that does not reveal the solution.
• Unique solutions only: cells are removed from a complete grid only while a solver still finds exactly one solution.

Related puzzles

• Trail — one line through every cell, numbers in order (like Zip).
• Regions — one star per row, column and region (like Queens).
• Pixel — nonograms.
• Digits — mini sudoku.

DailyLogic is not affiliated with LinkedIn; game names are mentioned only to describe the puzzle type.