Tectonic
A number logic puzzle: every region holds the digits 1 to N, and the same digit may never touch itself, not even diagonally. A new puzzle whenever you like, in three difficulties.
- 1 player
- 5–40 min
- Logic puzzle
- Numbers
- Solo
Try it right away, without an account: 4 rounds a day. With an account you play as much as you like and get on the top list. Free during the beta, no ads and nothing to download. Play in the browser on a computer, tablet or phone.
How to play
- Every cell holds one digit.
- A region of one cell holds 1, a region of two cells holds 1 and 2, a region of three holds 1, 2 and 3, and so on up to 5.
- The same digit may not stand in two cells that touch – not even diagonally.
Using the game
- Pick an empty cell by clicking or tapping it. Drag across several cells to mark them all at once.
- Enter a digit with the buttons or the keyboard.
- Turn on Notes to write small candidate digits in the cell, just like in the magazine.
- Mistakes are marked in red (can be turned off in Settings).
Difficulty
- Easy: 6 × 7 cells and many digits from the start. Every step is a "single": only one digit fits the cell, or the digit fits only one place in its region. 5–10 minutes.
- Medium: 7 × 9 cells and fewer digits. You need to cross out candidates, for example when every place for a digit in a region touches the same outside cell. 10–20 minutes.
- Hard: 8 × 10 cells and very few digits. Needs pairs and triples and long chains of steps. 20–40 minutes.
Keyboard
- Arrow keys: move between cells
- Click and drag: mark several cells (diagonally too)
- Ctrl/Shift + click, Shift + arrow: add cells to the marking
- A: mark all empty cells
- Esc: clear the marking
- Z: digits
- X: notes
- N or space: switch between digits and notes
- 1–5: write in every marked cell
- Shift + 1–5: write in the other mode (note instead of digit and the other way round)
- Backspace / Delete / 0: erase the marked cells
- Ctrl + Z or U: undo
- H: hint
- P: pause
Questions
Is there always a unique solution?
Yes. Every puzzle is made here and checked so that it can be solved by logic all the way, without guessing. That means there is only one solution.
Where does Tectonic come from?
The puzzle is also called Suguru and was created by the Japanese puzzle maker Naoki Inaba. In Sweden it appears in Tankesport magazines, among others.
Is my puzzle saved?
Yes, in this browser. You can close the page and continue later. Best times are saved per difficulty.
Can I play the same puzzle as a friend?
Yes. Tap the puzzle number and send the link.
Questions and answers
How do you play Tectonic?
A number logic puzzle: every region holds the digits 1 to N, and the same digit may never touch itself, not even diagonally. A new puzzle whenever you like, in three difficulties. The full rules are above.
How many can play Tectonic?
Tectonic is played alone.
How long does a game of Tectonic take?
About 5–40 minutes.
Can you play Tectonic without an account?
Yes. You can try 4 rounds a day without an account. With an account you play as much as you like.
Can you play Tectonic on a phone?
Yes. The game runs in the browser on phones, tablets and computers. There is nothing to download.
Does it cost anything to play Tectonic here?
No. Spelbordet is free during the beta and has no ads.