Please use logical thinking instead of guessing! Each puzzle only has one solution.

In pen mode, you can directly enter the candidate number by using Shift + number (Alt + number).
In pencil mode, you can directly enter numbers by using Shift + number (Alt + number).
Key C (or Del, BackSpace): to clear the digit or candidate marks in the selected cells.
Key ESC: to deselect.
Key P: a toggle switch to change from pencil and pen mode.

What is Newdoku?

Newdoku is also known as Kendoku, KenKen, Calcudoku and Mathdoku.
Newdoku is the most popular calculation game after the success of Sudoku. It is a puzzle game that can help develop brain potential and improve concentration. This game was invented by Tetsuya Miyamoto, who is a Japanese teacher, to help children study arithmetic.

Calcudoku Rules

Each puzzle is an NxN grid.
Several adjacent cells can form a group. The boundaries of each group are marked using thick outlines. A clue in one cell of each group specifies the target number and operation. Fill the NxN grid with the numbers 1 through N. Each number must appear once in each row and column, and each group must satisfy its arithmetic clue.

About Newdoku.com

Newdoku.com is a professional online game website, where you can play high-quality kenken, including kendoku puzzles from 3x3,4x4,5x5,6x6 to 9x9 size with five difficulty levels.
All puzzles on Newdoku.com can be printed. You can download and print the PDF. We will update PDF documents occasionally.
All puzzles are specially designed by humans. Each puzzle can be solved through logical reasoning without guessing.

Printable Calcudoku puzzles (Daily update)

This website provides printable Newdoku puzzles, updated daily, with four puzzles per page and their solutions. We recommend printing on A4 paper.

3X3 Calcudoku puzzles

Only includes addition	Easiest
Only includes addition and subtraction	Easiest
Only includes multiplication and division	Easiest
Includes addition, subtraction, multiplication and division	Easiest

4X4 Calcudoku puzzles

Only includes addition	Easiest Easy Hard Expert Extreme
Only includes addition and subtraction	Easiest Easy Hard Expert Extreme
Only includes multiplication and division	Easiest Easy Hard Expert Extreme
Includes addition, subtraction, multiplication and division	Easiest Easy Hard Expert Extreme

5X5 Calcudoku puzzles

Only includes addition	Easiest Easy Hard Expert Extreme
Only includes addition and subtraction	Easiest Easy Hard Expert Extreme
Only includes multiplication and division	Easiest Easy Hard Expert Extreme
Includes addition, subtraction, multiplication and division	Easiest Easy Hard Expert Extreme

6X6 Calcudoku puzzles

Only includes addition	Easiest Easy Hard Expert Extreme
Only includes addition and subtraction	Easiest Easy Hard Expert Extreme
Only includes multiplication and division	Easiest Easy Hard Expert Extreme
Includes addition, subtraction, multiplication and division	Easiest Easy Hard Expert Extreme

7X7 Calcudoku puzzles

Only includes addition	Easiest Easy Hard Expert Extreme
Only includes addition and subtraction	Easiest Easy Hard Expert Extreme
Only includes multiplication and division	Easiest Easy Hard Expert Extreme
Includes addition, subtraction, multiplication and division	Easiest Easy Hard Expert Extreme

8X8 Calcudoku puzzles

Only includes addition	Easiest Easy Hard Expert Extreme
Only includes addition and subtraction	Easiest Easy Hard Expert Extreme
Only includes multiplication and division	Easiest Easy Hard Expert Extreme
Includes addition, subtraction, multiplication and division	Easiest Easy Hard Expert Extreme

9X9 Calcudoku puzzles

Only includes addition	Easiest Easy Hard Expert Extreme
Only includes addition and subtraction	Easiest Easy Hard Expert Extreme
Only includes multiplication and division	Easiest Easy Hard Expert Extreme
Includes addition, subtraction, multiplication and division	Easiest Easy Hard Expert Extreme