What Makes a Sudoku "Gentle"? Clues, Symmetry and No Guessing

Two sudokus can look almost identical and play completely differently. When we say our sudokus are gentle, we mean three specific, checkable things.

1. Plenty of givens

"Givens" are the numbers printed at the start. A standard newspaper sudoku might have 25–30; the hardest research puzzles go below 20 (the theoretical minimum for a unique solution is 17). Ours have 37 givens — more than a third of the grid is already filled in. More givens means more places where simple scanning works, and fewer moments of being genuinely stuck.

2. A solution you can reach by logic

A unique-solution check (which all of our puzzles pass — see how our puzzles are made) means the grid is never ambiguous: there is no point where two answers are equally valid and you must pick one and hope. With 37 givens, the basic techniques in our beginner's guide — scanning, nearly-full lines, pencil marks — are enough to finish.

3. Symmetrical givens

Our givens are removed in rotationally symmetrical pairs, the presentation style popularised by Nikoli in Japan. Symmetry does not change the difficulty, but it makes the starting grid look balanced and pleasant — a small thing that makes a puzzle feel welcoming rather than sparse.

What "gentle" does not mean

It does not mean the puzzle solves itself. You will still pause, scan, and have satisfying moments when a stubborn row finally gives way. Gentle means the difficulty is fair: every step follows from the numbers in front of you, and the one true solution is always reachable.

If you are new, start with the guide, then take a gentle sudoku at whatever pace suits the morning.