Follow the rules and fill the grid with the correct numbers. Four levels to try and thousands of puzzles to solve!

Each large puzzle consists of several mini puzzles. To enter a number in the grid, tap the square to select it, then tap a number on the number pad. To remove a number, select the square and tap the C button. If you want a hint, tap the light bulb. The first empty or incorrect square will show the correct answer.

Calcudoku game rules

A mini-puzzle consists of a boldly outlined group of one or more squares of the same color. Each mini-puzzle contains a number followed by an operator. The operator tells how to work with the individual digits in the mini-puzzle. The number is the result of the operator. For example, a mini-puzzle consisting of two squares containing the number 5 followed by a plus sign (5+) tells us that the numbers in the mini-puzzle will add up to a total of 5. The digit can only appear once in any row or column. When the same digit appears more than once, each digit will have a red background to indicate that an error has occurred.

Advice
Look for mini-puzzles with one square, as they are the easiest to solve. Entering a digit will help narrow down the selection for other squares in the larger puzzle.

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