What Is Suguru? Rules, No-Touch Numbers, and Tactics

What is Suguru, exactly?

What is Suguru? Sometimes called Tectonic, Suguru is a compact number puzzle that feels like a friendlier, more colorful relative of Sudoku. The grid is divided into small cages, each made of one to several cells, and you fill every cage with the numbers from one up to its own size. A one-cell cage holds a single one, a five-cell cage holds one through five, and so on. The rule that gives Suguru its bite is about adjacency: identical numbers may never touch, not even diagonally. Suguru puzzles are usually small and quick, which makes them perfect for a short break, yet the diagonal touching rule packs in enough tension to keep experienced solvers thinking. It is a lovely on-ramp for anyone curious about Sudoku-style logic.

The rules of Suguru

The rules of Suguru are easy to hold in your head. The grid is split into outlined cages, and each cage of size n must be filled with the numbers one through n, using each of those numbers exactly once inside the cage. Because cages come in different sizes, the range of numbers changes from cage to cage, unlike Sudoku where every region uses one through nine. The defining constraint is that no two identical numbers may be adjacent in any direction, including the four diagonals, so a number blocks all eight of its surrounding cells from repeating it. Some cells arrive already filled to get you started. When every cage is complete and no equal numbers touch anywhere, even corner to corner, the puzzle is solved with a single valid answer.

Here is a short worked example. Suppose you have a cage of five cells; it must contain one, two, three, four, and five, each appearing once. Say you place a three in one of those cells. Immediately every cell touching that three, including the diagonal neighbors and even cells in other cages, is forbidden from being a three. If a neighboring cage of three cells has two of its numbers already fixed as one and two, then its last cell must be three, but the no-touching rule may block that if a three sits diagonally beside it, forcing a rethink of the earlier placement. This constant push and pull between cage completion and the diagonal rule is where Suguru gets its clever, satisfying deductions.

Beginner tactics for Suguru

• Fill the smallest cages first; a one-cell cage is always a one, and tiny cages have very few arrangements.
• After placing any number, block all eight surrounding cells from repeating it, since the no-touching rule includes diagonals.
• Look for cages where only one number is missing and place it, then check the diagonal rule immediately.
• Use pre-filled cells as anchors, radiating their restrictions outward across cage borders.
• Pencil in candidates for tricky cells, then eliminate any that would touch a matching number diagonally or orthogonally.

How Suguru compares to Sudoku

Suguru is like Sudoku with the dials adjusted. Both fill a grid using logic alone and both guarantee one solution, but Suguru uses variable-size cages with small number ranges and adds the strict no-touching rule across diagonals, which Sudoku does not have. That makes Suguru quicker to complete while still demanding real care. If these bite-sized logic puzzles suit you, you might also enjoy BrainSnail, a friendly brain-teaser collection from the studio behind Shapedoku. And when you want the fuller every-symbol-once experience of classic Sudoku with a calm, mystical feel, Shapedoku swaps the digits one through nine for nine glowing shapes so you can solve by color and form rather than numbers. It is colorblind-friendly by design, and you can try the free solver and printable puzzles at shapedoku.com or play instantly at app.shapedoku.com.