Brain training with Swudoku
Most “brain training” copy sounds like it was written by a supplement ad. Swudoku is a daily 9×9 Swap Sudoku you share with everyone else. You swap tiles instead of filling blanks. There is no clock watching you.
That’s the pitch: a small, repeatable stretch of attention. Not a treatment, not a diagnosis, not a miracle.
A short daily ritual
Most people finish a board in about 3–5 minutes. Long enough that you have to actually look at the grid. Short enough that it fits before a meeting or at the end of the day.
You’re doing one job: put every number back where it belongs, in as few swaps as possible. Score is the swap count. Lower is better. Nobody is timing how fast you tap.
If you want the rules in one place, start with how to play.
What you’re actually practising
A jumbled-but-full grid forces you to read before you move. Grey tiles are in the wrong cell. Yellow means the number is already home, but its row, column, and 3×3 block aren’t finished. Green is home plus any one of those three groups complete. Dark green is all three.
So you scan for doubles in a row, hunt a Double Swap (both tiles land correctly in one go), and decide whether this swap is worth the point it will add to your score. That’s pattern recognition and a bit of looking ahead. It’s also just sitting still.
We are not going to pretend this cures ADHD, grows new neurons, or is “backed by a study we cannot name.” If a quiet puzzle helps you settle into the day, that’s enough.
Why the shared board helps
Everyone gets the same daily puzzle. You can compare swap counts with whoever you play with. Signed-in finishers may also see a How you compare histogram for that day’s board.
Same account on the web and in the iOS app keeps your game stats in sync both ways. Past puzzles live in the Archive on the web when you’re signed in. The iOS app is today’s board only.
Play today’s one
Open today’s Swudoku. See how few swaps you need.
More detail lives in the FAQs if you want colours, scoring, or accounts spelled out.