No Touch Sudoku
A Classic Sudoku variation where no same digit touches diagonally
No Touch Sudoku, also known as Untouchable Sudoku or Un-Touch Sudoku, is a Classic Sudoku lookalike variation. In this puzzle type, an additional rule applies: no two numbers can touch each other diagonally. This Sudoku variation is used in many Sudoku contests worldwide under the standard name No Touch Sudoku. To solve No Touch Sudoku, look for the central cell of each 3x3 box which touches the next box — many possibilities get eliminated for the digit in this central cell. This collection includes standard No Touch Sudoku puzzles, Untouchable Sudoku, and UnTouch Trio Sudoku. This page contains links to all No Touch Sudoku puzzles and their variations published on this website.
Rules of No Touch Sudoku
Place a digit from 1 to 9 into each of the empty cells so that each digit appears exactly once in each row, column, and 3x3 outlined box. Additionally, no two same digits can touch each other diagonally.
Why Solve No Touch Sudoku?
- Enhances spatial awareness by tracking diagonal relationships between digits.
- A Classic Sudoku lookalike with a simple yet powerful additional rule.
- Features multiple names: No Touch, Untouchable, and Un-Touch Sudoku.
- Used in many Sudoku contests around the world as a standard variation.
- Great for intermediate solvers looking for a step up from Classic Sudoku.
- Includes UnTouch Trio Sudoku variation for an added challenge.
Key Techniques for Solving No-Touch Sudoku
- Apply the No Touch rule; the same digit cannot appear in diagonally adjacent cells.
- Look at the central cells of each 3x3 box that touch cells in adjacent boxes diagonally.
- Eliminate diagonally if a digit appears in a cell; eliminate it from all 8 surrounding cells.
- Apply standard Sudoku logic; always apply row, column, and box eliminations.
- Use cross-hatching to check rows, columns, and boxes while tracking diagonal restrictions.
- Check your work, verify that no same digit appears diagonally adjacent anywhere in the grid.
🚫 No Touch Sudoku Puzzles
🚫 No Touch Sudoku Variations
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Frequently Asked Questions
What is No Touch Sudoku?
No Touch Sudoku also called Untouchable Sudoku or Un-Touch Sudoku is a variation of Classic Sudoku where an additional rule applies: no same digit can touch each other diagonally. This means if a digit appears in a cell, the same digit cannot appear in any of the 8 surrounding cells.
What is the difference between No Touch Sudoku and Untouchable Sudoku?
There is no difference between No Touch Sudoku and Untouchable Sudoku. They are different names for the same puzzle type. No Touch Sudoku is the standard name used in most Sudoku contests, while Untouchable Sudoku and Un-Touch Sudoku are alternative names.
What is UnTouch Trio Sudoku?
UnTouch Trio Sudoku is a variation of No Touch Sudoku. It combines that rules of the No Touch Sudoku and Trio Sudoku. This adds an extra layer of complexity to the standard No Touch Sudoku rules.
What sizes of No Touch Sudoku are available?
This collection focuses on 9x9 No Touch Sudoku puzzles. The 9x9 grid offers challenging puzzles suitable for intermediate to advanced solvers looking to improve their spatial reasoning skills.
Where can I find more Sudoku variations?
The Sudoku Variations Main Page is the central index for all Sudoku variant types available on Fun With Puzzles. It covers a wide range of constraint-based variants and is the best place to discover new Sudoku challenges.
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Feel very happy to have completed both Untouch puzzles within 10 mins. 202 took a little more time but was very smooth once I got the clue.