Suguru
Regions of one to five cells: each holds its digits from 1 up, and no two alike ever touch.
Suguru is a number puzzle on a board cut into regions of one to five cells. Every region takes the digits from 1 up to the number of its cells, each once, and two alike never touch — not even at a corner. Two rules, no arithmetic, and yet one cell can settle half the board.
Here it is written the way Sudoku is — pick a cell, pick a digit, pencil in notes if you like — and the board tells you only what the digits standing on it already say: a digit its region already holds turns reddish, and so does a digit touching its like. No hints, and nothing that checks you against the answer. The same puzzle goes by the names other publishers gave it: Tectonic and Kemaru.
A new board every day — 6 × 6, 8 × 8, and 10 × 10 — the same for everybody, each with a single solution that reasoning alone reaches. No timer and no account needed: a board left half-done waits for you until the day turns, at midnight UTC.
Today’s boards
How to play
The board is cut into regions of one to five cells. Fill every region with the digits from 1 up to the number of its cells, each once — a region of three holds 1, 2 and 3, a region of five the digits 1 to 5.
Two cells that touch — along a side or at a corner alone — never hold the same digit, whether or not they share a region.
Some digits come with the board.
Tap a cell and pick a digit on the pad under the board; the same digit again clears it. With notes on, digits are pencilled small in the cell instead. The digits the board came with stay put.
A reddish cell holds a digit its region already has or has no room for, or a digit touching its like.
Beyond today’s board
No timer. Leave and come back — it’s saved.
Play today’s Suguru