Logic GamesLogic & pattern practice
Queens guide
Train for Queens with region locks and forced placements.
Puzzle practice guide
How to play Tango
Learn balance, triples, and linked cells.
Practice Tango online with sun-and-moon puzzles that combine counting and local constraints. The trainer offers an archive and generated boards, so you can repeat a technique without waiting for another daily puzzle. A reliable solve alternates between whole-line counts and small groups of cells.
01 / The essentials
Tango rules
- Every row and column contains equal numbers of suns and moons.
- Three identical symbols may not appear consecutively horizontally or vertically.
- An equals sign joins identical symbols; a cross joins opposite symbols. Given symbols are fixed.
02 / Build the habit
Tango strategy
Finish balanced lines
Count the suns and moons already present. Once a line reaches its quota for one symbol, every remaining cell must be the other. Check columns as carefully as rows.
Prevent a third symbol
Two adjacent suns force moons immediately before and after them, where those cells exist. Two suns with a single empty cell between them force a moon in the gap. Apply the same patterns to moons.
Propagate the links
Carry a known symbol across an equals or opposite clue. Then recheck balance and triples in both affected lines; a link can trigger a chain far from the original placement.
03 / Worked example
Count before guessing
In a six-cell row, exactly three cells must be suns. If three suns are already placed, the remaining three cells are moons. Separately, sun–empty–sun always forces a moon in the middle, even before the row’s total is known.
04 / Put it into practice
A Tango practice plan
- Finish one board using counts first, then check every consecutive group of three.
- On another board, look for gap patterns and linked cells before counting. Notice which approach unlocks more information.
- Use a harder board to practice switching between rows and columns after each new symbol.
A common mistake
Equal totals alone do not complete Tango. A balanced row can still contain a forbidden triple or violate a link. Keep all three rules active.
How is Tango different from Sudoku?
Tango uses two symbols and permits repeated neighbors, but forbids runs of three and requires balanced lines. Sudoku instead forbids repeated numbers within its rows, columns, and boxes.
Guide updated . Rules describe the version on Logic Games.