Puzzles

Calcudoku: Sum Garden.

Arithmetic Latin squares: every outlined cage shows a target and an operation.

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Enable JavaScript to play. Your game saves stay in this browser.How to playSelect a square, then use the number pad or press a digit. N toggles notes, Backspace or 0 clears, and arrow keys move.

A 4 × 4 grid uses 1–4, a 5 × 5 grid 1–5 and a 6 × 6 grid 1–6. No digit repeats in a row or column.

Each outlined cage shows a target and an operation: + adds, × multiplies, − subtracts the smaller digit from the larger and ÷ divides the larger by the smaller.

Subtraction and division cages have two squares. A digit may repeat within a cage when the squares are in different rows and columns. A single square shows its digit.

Every grid has exactly one solution. Repeated digits and cages that miss their target are marked.

Notes record candidates; placing a digit removes it from the notes of its row and column. Hint reveals the selected square, or the first empty or wrong one.

Daily grids are the same for everyone at each size on a UTC day.

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How to play

Goal. Fill the grid so every row and column holds each digit once, and each outlined cage reaches its target with its operation.

Cages and operations

A 4 × 4 grid uses 1–4, a 5 × 5 grid 1–5 and a 6 × 6 grid 1–6, each once per row and column.
+ adds and × multiplies every square in the cage. − and ÷ cages have two squares: the larger digit minus, or divided by, the smaller.
A digit may repeat inside a cage when the squares are in different rows and columns. A single square simply shows its digit.

Cage	Squares	Digits
3÷	2	1 and 3
3−	2	1 and 4
12×	2	3 and 4
7+	2	3 and 4

Reading targets. In a 4 × 4 grid, few digit pairs reach each target, so start with the cages that leave only one choice.

Help

Every grid has exactly one solution. Repeated digits and cages that miss their target are marked.
Notes record candidates. Hint reveals the selected square, or the first empty or wrong one.
Choose 4 × 4, 5 × 5 or 6 × 6, or today's grid.