Suguru: Number Logic Puzzle

Fill each little room with numbers, starting from 1. The same number can never touch — not across, not up and down, not even diagonally. Every puzzle solves by logic alone, and when you're stuck, the hint shows you why. Suguru (also known as Tectonic) is a number logic puzzle played on a grid split into rooms. A room of size n holds the numbers 1 through n, once each, and no two matching numbers may sit in neighbouring cells — diagonals included. That one twist gives it a feel all its own, quite different from sudoku. Every puzzle is built to be solvable by deduction. You never have to place a number on a hunch and watch the board fall apart. Just the quiet satisfaction of pinning down one certain cell at a time. ■ Features • A logic rule unlike sudoku: no matching neighbours, diagonals included • Every puzzle solvable by deduction — no guessing • Four sizes: 5×5, 6×6, 7×7, 8×8 (Hard and Expert call for deeper techniques) • Hints that explain: the hint highlights the cells that prove the next number and tells you why. If a number on the board is wrong, it points that out first • Continue: leave mid-puzzle and pick up on the same board next time • A fresh Daily puzzle with a solving streak • 19 achievements and personal-best records • Pencil marks, erase and undo • A calm design in traditional Japanese colours, with dark mode • English and Japanese • No account needed ■ Great for you if… • You love sudoku and want a fresh next puzzle • You'd rather deduce than guess • You want to understand the "why" when you're stuck • You like a quiet way to use your mind on a commute or before bed • You're building a small daily habit ■ Privacy Your records stay on your device and are never sent anywhere. No account, no sign-in. Puzzles are generated on the device, so you can play without a connection. To introduce the developer's other apps, Suguru may fetch public App Store information (app names and icons); none of your data is sent.