A LITTLE ROOM TO THINK
Classic Sudoku
Find your moment
of clarity.
Nine numbers. One place each.
Follow the clues until everything clicks.
- Puzzles to explore,
- from a gentle start to a deeper one.
- Every day
- a daily puzzle
01 / HOW IT PLAYS
Three rules.
Nothing else.
Fill the grid so no number repeats. Every puzzle has exactly one answer, and you can always reach it by thinking — never by guessing.
- 01
Every row
holds 1 to 9 once.
- 02
Every column
holds 1 to 9 once.
- 03
Every 3 × 3 box
holds 1 to 9 once.
02 / SMALL MARKS, BIG POSSIBILITIES
Pencil first.
Ink when you’re sure.
The board tells you what’s fixed, lets you keep a maybe, and shows your answers in blue.
Givens
Printed in place. Your first footholds.
Notes
Pencil in what it might be.
Your answer
Placed in blue, checked as you go.
Undo & hint
Step back, or ask for a nudge.
03 / THE MOMENT IT CLICKS
It was there
all along.
The first box is missing 8 and 9.
But there’s already an 8 in the top row.
That empty corner?
It can only be 9.
The row rules out 8.
The corner belongs to 9.
04 / FOLLOW THE THREAD
A gentle start.
A deeper thought.
Fewer numbers to start from, longer chains of thought. The grid stays familiar as the thinking deepens.
Easy
Find your first foothold.
Medium
Follow the next connection.
Hard
Stay with a longer thought.
Expert
Savour the discovery.
A fresh page, every day. Come back for the daily puzzle.
A few simple moves.
Use 1–9 once in every row,
column and 3 × 3 box.
- Choose a square
- Tap a cell, then a number.
Or type 1–9. - Leave a possibility
- Use Notes to pencil it in.
Undo to think again. - Find a way forward
- Ask for a hint
when you need a nudge.
YOUR NEXT CLEAR ANSWER
One square.
One thought.
Your moment.
Choose your puzzle.
See where it takes you.