Suguru — also called Tectonic, Number Cages, or Suguro — is a number-placement logic puzzle invented by Japanese puzzle author Naoki Inaba. Each board is divided into oddly-shaped cages (also called regions or zones). Your job is to fill every cell with a number, following two simple rules.

The two rules

• Cage rule. Every cage must contain the numbers from 1 up to its size, each appearing exactly once. A cage of 2 cells holds 1 and 2. A cage of 3 holds 1, 2, 3. The largest cages hold 1 through 5.
• Touching rule. No two cells that touch — including diagonally — may share the same number. A cell touches all 8 of its neighbours.

How to play

• Click or tap a cell to open the number picker.
• Pick a number from 1 up to that cage's size. Tap ✕ to clear.
• On desktop, you can also press 1–5 on the keyboard while a cell is selected.
• Given cells (shown in bold) are fixed clues — you can't change them.
• Cells that violate either rule glow red so mistakes are visible immediately.

Difficulty & grid size

Choose any difficulty from Beginner to Cyborg ☠. Beginner/Easy run on a 5×5 grid with many given cells. Medium uses a 6×6 grid. Hard, Very Hard, Scientist and Cyborg all use the full 7×7 grid with progressively fewer given clues — Cyborg leaves only ~28% of the cells filled at the start.

Daily challenge

Every day, the 🗓 Daily button serves the same puzzle to every player worldwide. Solve it once a day to build your streak.

Suguru was popularised by Dutch newspaper NRC Handelsblad under the name Tectonic. It belongs to the same family of "cage" puzzles as Killer Sudoku and KenKen, but with a much simpler rule set — no arithmetic, just the two rules above. That makes it approachable for beginners while still rewarding the kind of careful constraint-propagation thinking that Sudoku players love.

If you enjoy Suguru Max, you'll probably also like our Calcudoku (cages with arithmetic), Sudoku, and Flag Zone (Queens-style logic).