Tectonic (Suguru)
Tectonic, also known as Suguru, is a logic puzzle of outlined regions. Fill each region with the numbers from 1 to its size, and never let two equal numbers touch, not even at a corner.
Choose a 6×6 or 8×8 board in Easy, Medium or Hard. Every puzzle has exactly one solution you can reach by reasoning, hints explain the next step when you need one, and your games are kept in this browser.
Learn the techniques
- Tectonic singles
How to find the only number a cell can take and the only place left for a number in a region, with worked Tectonic examples.
- Shared neighbour
How a cell that touches every place a region’s missing number could go is ruled out for that number, with a worked Tectonic example.
- Pairs and triples
How cells that share their last few numbers rule those numbers out elsewhere, with a worked Tectonic example of a pair.