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
On paper
A PDF of today’s board at each level, new every day: A4, black and white, with how to play on the last page. Free, no sign-up.
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.
No timer. Leave and come back — it’s saved.
Play today’s Suguru