# PrintSudoku > PrintSudoku is a free, multilingual web app for playing, printing, and tracking Sudoku. It publishes a fresh puzzle every day at each of 10 difficulty levels — six classic ones plus four variants (magic, Sudoku X, killer and samurai) — keeps a browsable archive going back to 2005, produces printable PDF puzzle and solution booklets, and offers optional free accounts for saving progress, viewing statistics, and competing on a public leaderboard. The interface is available in 96 languages. Every public page lives under a language prefix, e.g. `/en/`, `/es/`, `/fr/`. Playing requires no account; an account only adds progress saving, statistics, and leaderboard ranking. For a complete, self-contained description (sudoku rules, difficulty levels, solving techniques, features, and FAQ) read the full file linked under "Reference". ## Core pages - [Daily puzzle (home)](https://printsudoku.com/en/): Play the current day's Sudoku; pick a difficulty, reveal the solution, navigate by day. - [Play Sudoku online](https://printsudoku.com/en/play-sudoku-online/): Play in the browser with no app and no sign-up — a new puzzle every day across the difficulty levels. - [Printable Sudoku (hub)](https://printsudoku.com/en/printable-sudoku/): Free printable Sudoku as PDF, organised by difficulty level. - [About](https://printsudoku.com/en/about/): What PrintSudoku offers and how the site works. - [Lessons](https://printsudoku.com/en/lessons/): Guide to solving Sudoku with logic — covers naked/hidden singles through Swordfish, XYZ-Wing, and box/line reduction. - [Archive (history)](https://printsudoku.com/en/history/): Browse past daily puzzles by year and calendar date, back to 2005. - [Leaderboard](https://printsudoku.com/en/leaderboard/): Public ranking of players by points and completed games. ## Puzzle variants Three of the 10 levels change the rules rather than the difficulty. Each has its own daily puzzle, its own printable landing, and its own PDF books: - **Sudoku X** (`sudoku-x`) — on top of the classic rules, both main diagonals must also contain the digits 1–9 exactly once. - **Killer** (`sudoku-killer`) — the grid starts completely empty. The 81 cells are partitioned into cages drawn with a dashed outline; each cage shows the total its digits must add up to, and no digit repeats inside a cage. The cage totals replace the starting digits entirely. - **Magic** (`magic-sudoku`) — both main diagonals must also contain 1–9, and in each 3×3 box the highlighted cells hold exactly the digits 1 to N, where N is how many cells that box highlights. - **Samurai** (`samurai-sudoku`) — five overlapping 9×9 grids in a Gattai-5 cross: each corner grid shares its inner 3×3 box with the matching corner box of the central grid, so the shared boxes must satisfy both grids at once. Playable on the interactive board and printable as full-page PDFs. ## Printable Sudoku 10 printable landings, one per level, plus a tenth for `mixed` — a single book blending every level into one ramped booklet. Level slugs: `very-easy`, `easy`, `medium`, `hard`, `very-hard`, `evil`, `magic-sudoku`, `sudoku-x`, `sudoku-killer`, `samurai-sudoku`. Each page carries sample puzzles, printing guidance, and per-year archives back to 2005. Section and level slugs are localized per language (English `/en/printable-sudoku/easy/`, Spanish `/es/sudoku-imprimible/facil/`), so use the per-language sitemaps to resolve them. - Level landing: `https://printsudoku.com/en/printable-sudoku//` — e.g. [Easy](https://printsudoku.com/en/printable-sudoku/easy/). Each landing offers PDF booklets of 20, 60 or 120 puzzles (solutions as a separate PDF), in A4 or US Letter. ## Reference - [llms-full.txt](https://printsudoku.com/llms-full.txt): Full self-contained description for LLMs — rules, difficulty levels, solving techniques, account features, languages, and FAQ. - [Sitemap index](https://printsudoku.com/sitemap-index.xml): All pages across all 96 languages. ## Notes - Free to play; no account or signup needed to solve the daily puzzles. - 96 languages with fully localized UI, lessons, and printable output. - No ads-only paywall and no app install — it is a plain web page that also prints.