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Fyll varje markerad region med siffror från 1 till N (där N är antalet celler i regionen) så att inga två angränsande celler (inklusive diagonalt) har samma siffra.

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Today's Tectonic challenge

Detailed results are kept for the current month and the previous three months. Older puzzles remain playable without new account results or puzzle points. Lifetime progress is preserved.

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October
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Today's challenge

Easy

27 October 2026 • Not played

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Everything you need to know about Tectonic

Learn the rules and try a practical solving tip.

What is Tectonic?

Tectonic is a logic puzzle divided into irregular regions. Each region determines which numbers it contains, while neighbouring cells restrict their positions.

Tectonic rules

  • A region with N cells must contain the numbers 1 to N exactly once. A three-cell region contains 1, 2 and 3.
  • Neighbouring cells may not contain the same number, including diagonally and across region boundaries.
  • Keep the given numbers unchanged.

Tips

Tip: A one-cell region must contain 1. Then rule out 1 in all neighbouring cells, including diagonally.

How to solve Tectonic: a step-by-step example

Imagine a three-cell region in a horizontal row: 1 · ·. The empty cells must contain 2 and 3, since the region needs 1, 2 and 3 exactly once.

There is a given 2 directly below the first cell, in another region. It is diagonally adjacent to the middle cell, so the middle cannot be 2. It must be 3. The last cell in the region is then 2, giving 1 3 2. The last cell is not a neighbour of the given 2.

This is a local example, not a complete puzzle. Check the other neighbours too: identical numbers must not touch, even diagonally. A number must fit both its region and all its neighbours.

Common Tectonic mistakes

  • Forgetting diagonals. A cell can have up to eight neighbours, including cells in other regions.
  • Using the same number range everywhere. A two-cell region contains 1 and 2; a five-cell region contains 1 to 5.
  • Applying Sudoku row rules. A number may appear more than once in a row or column if the cells are not neighbours and all region rules are satisfied.
  • Eliminating a candidate without a reason. Start with the missing numbers in the region, then rule out those already present in neighbouring cells.

Frequently asked questions about Tectonic

Is Tectonic the same type of puzzle as Suguru?

Suguru is another name used for this type of region puzzle. On Testportalen, each region contains 1 up to its size, and identical numbers cannot be neighbours, even diagonally.

Can I play Tectonic for free without an account?

Yes, you can play directly in your browser without an account. Log in to save personal progress and collect puzzle points from completed daily puzzles.

Where is the daily Tectonic?

Choose the daily challenge on this page. Free play at different difficulty levels is available for more practice.

How is Tectonic different from Sudoku?

In Tectonic, the region size determines which numbers to use. Numbers do not have to be unique across an entire row or column, but identical numbers cannot touch. In standard Sudoku, each row, column and 3×3 box contains 1 to 9.