# Sudoku Sama

> Sudoku Sama is an iPhone and iPad app by sleep9ull. It asks for one key placement in a daily 6×6 Sudoku puzzle, with no timer. Today’s puzzle is free. Sudoku Sama is not affiliated with sudokusama.com.

Sudoku Sama is for English-language iPhone and iPad users who want a short daily 6×6 puzzle rather than a speed score. It requires iOS or iPadOS 26 or later. You play in the app. This website is a set of reading guides.

## Key facts

- Daily 6×6 Sudoku, with 2×3 boxes and digits 1–6.
- One key placement: the day asks where one number belongs, not that you fill every empty cell.
- No timer.
- Today’s puzzle is free. No ads. No Sudoku Sama account.
- A short science reading unlocks after you finish today’s puzzle. Until you finish, only a teaser question is shown. REFERENCE opens the source.
- HOW? replay is free. It plays the numbered steps. Tap or drag the progress bar to jump. The counter reads “Step n / N”. You can replay from the start.
- Premium adds the Archive, hints while solving, a collection built from completed puzzles, and a member profile card. A hint highlights the cell for the first reasoning step.
- iCloud syncs dates and results only: Daily completion dates and grades, and Archive collection dates and grades. It does not sync the reading text, puzzle boards, answers, display name, or preferences.
- The US App Store listing checked on 17 October 2026 was English only, required iOS 26.0 or later, and showed 1 rating. An iTunes Lookup with country=cn returned no result.

## Science readings

Science readings are AI-generated editorial text based on linked NASA reference materials. NASA has not reviewed or endorsed these readings or this app.

The public wording lives on the product pages, including [Science readings](https://sleep9ull.com/sudoku-sama/science-readings/).

## Not an affiliation

Sudoku Sama is an iPhone & iPad app by sleep9ull; it is not affiliated with sudokusama.com.

## Important URLs

- [sleep9ull](https://sleep9ull.com/): the public profile.
- [Sudoku Sama](https://sleep9ull.com/sudoku-sama/): the product page.
- [How to play](https://sleep9ull.com/sudoku-sama/how-to-play/): the tap flow for one placement.
- [6×6 Sudoku rules](https://sleep9ull.com/sudoku-sama/6x6-sudoku-rules/): rows, columns, and 2×3 boxes.
- [One-move example](https://sleep9ull.com/sudoku-sama/one-move-example/): a worked placement.
- [Mini vs classic](https://sleep9ull.com/sudoku-sama/mini-vs-classic-sudoku/): 6×6 compared with 9×9.
- [One key placement](https://sleep9ull.com/sudoku-sama/one-key-placement/): what the day’s answer is.
- [Daily brain teaser, no timer](https://sleep9ull.com/sudoku-sama/daily-brain-teaser-no-timer/): a daily puzzle that does not score speed.
- [Hidden singles](https://sleep9ull.com/sudoku-sama/hidden-singles-6x6/): a 6×6 scan for a digit with one home.
- [Why 2×3 boxes](https://sleep9ull.com/sudoku-sama/why-6x6-boxes-are-2x3/): why a 6×6 box is a rectangle.
- [Daily streak](https://sleep9ull.com/sudoku-sama/daily-puzzle-streak/): what a completion streak counts.
- [Science readings](https://sleep9ull.com/sudoku-sama/science-readings/): what unlocks after you finish.
- [Step replay](https://sleep9ull.com/sudoku-sama/step-replay-learn-sudoku/): what HOW? shows.
- [Mini and 6×6 apps compared](https://sleep9ull.com/sudoku-sama/best-mini-6x6-sudoku-apps-iphone/): US App Store facts, not a ranking.
- [Support](https://sleep9ull.com/sudoku-sama/support/): contact and sync notes.
- [Privacy policy](https://sleep9ull.com/sudoku-sama/privacy/): downloads, optional analytics, and purchases.
- [App Store](https://apps.apple.com/app/id6811580598): install Sudoku Sama.
- [X](https://x.com/sleep9ull): sleep9ull on X.
- [Full notes for models](https://sleep9ull.com/llms-full.txt): the same facts with a line on each page.