How to Play Tango
Tango is a binary logic game where you fill a grid with two symbols — suns and moons. Every row and column must be perfectly balanced, no three consecutive symbols can match, and pair constraints between adjacent cells add an extra layer of deduction. The result is a satisfying game that plays like a mashup of Sudoku and binary constraint programming.
Tango Rules
Fill every cell with either a sun (☀) or a moon (🌙).
Each row and column must contain exactly the same number of suns and moons.
No three consecutive cells in a row or column may contain the same symbol.
Cells connected by an equals sign (=) must contain the same symbol.
Cells connected by an X sign (×) must contain different symbols.
Step-by-Step Guide
- Step 1
Look at the constraint clues first. An = sign forces two cells to match, while × forces them to differ.
- Step 2
Check for pairs: two consecutive identical symbols force the cells on either side to be the opposite symbol.
- Step 3
Count symbols in each row and column. When half are filled with one symbol, the remaining cells must be the other.
- Step 4
Use chain logic: a single forced cell can cascade through = and × constraints to unlock several others.
- Step 5
Fill the last remaining cells and verify that no three-in-a-row violations exist.
Strategy & Tips
Always process constraint clues (= and ×) before guessing — they provide guaranteed information.
When a row has three suns, every remaining empty cell in that row must be a moon.
Watch for implicit chains: an = constraint between two cells, one of which touches an ×, can resolve three cells at once.
If you are stuck, look for rows or columns with only two empty cells — they often have a single valid fill.
Difficulty Levels
The grid is always 6×6. Difficulty is controlled by the number of given cells and constraint clues revealed.
Easy
About 40% of cells are pre-filled with many constraint clues visible.
Medium
About 20% pre-filled with a moderate number of clues.
Hard
About 10% pre-filled with only a few clues shown.
Expert
Around 5% pre-filled with minimal constraint clues — deep logic required.
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