Number Games2 min read

How to play Kakuro

A crossword of numbers. Fill the white squares with digits 1 to 9 so every run adds up to the clue before it, with no digit twice in a run.

Goal

Fill every white square. Each puzzle has exactly one answer.

A black square's clues: the top-right number is the total of the run to its right, the bottom-left number the total of the run below it.
Select a white square and press a digit (or tap one below the grid). Backspace clears it.
The runs through the selected square are shaded. A repeated digit turns red; a finished run turns its clue green or red.
The board grows from 4×4 on Easy to 7×7 on Expert.

A run of two squares with the clue 4 must be 1 and 3, in some order - 2 and 2 would repeat a digit.

Some totals can only be made one way: 3 in two squares is 1+2, 17 is 8+9; in three squares, 6 is 1+2+3 and 24 is 7+8+9.
Where two runs cross, the square needs a digit both can use.
On Easy and Medium, a hint fills the selected square.

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.