Easy Calcudoku
Easy Calcudoku puzzles are 4×4. Work out which digits can make each cage's number with its operation, then place the digit that fits only one cell of a row or column.
Easy puzzles need at least one of these techniques, and may use any easier one:
- Hidden single
- In the highlighted row or column this digit fits in only one cell.
- Cage arithmetic
- Only some digits can make this cage's number with its sign, so the marked candidates are out.
How to play
Calcudoku is an arithmetic logic puzzle on a square grid. Fill each row and column with the digits from 1 up to the grid's size, once each. Thick outlines group cells into cages, and each cage's digits must make the number in its corner using the operation shown: add, subtract, multiply or divide.
Every Calcudoku here has exactly one solution and can be solved by logic alone. The grid grows from 4×4 at Easy to 6×6, and the level is set by the hardest technique the puzzle needs.
- Each row and each column holds every digit from 1 to the grid size once.
- A cage's digits make its number with its operation: + adds, × multiplies.
- − and ÷ cages have two cells and work in either order, larger digit first.
- A one-cell cage simply shows its digit; digits may repeat within a cage if they are in different rows and columns.
Playing on this site
- Select a cell, then type a digit or tap it on the number pad. Arrow keys move the selection.
- Turn on Notes (or press N) to pencil in candidates instead of answers.
- Hint first points out any wrong digits, then names the next technique and shows where it applies before giving anything away.
- Your puzzle is saved in this browser, so you can come back to it later.