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With beautiful graphics and killer features, Sudoku Free! is the best Sudoku app available for iOS.\n\nDUAL KEYPAD ENTRY \n\nTwo separate keypads, one for entries and one for notes, allow you to enter values quickly and easily.  No more tedious switching between entry mode and note mode to complete your puzzle.\n\nSMART NOTES\n\nThe optional auto-notes feature enters all of the notes into the puzzle for you and keeps them updated as you solve.  If you don't want that much help, the optional smart notes feature automatically deletes values from notes you have entered manually when they are no longer valid.  \n\nERROR CHECKING\n\nThe optional error checker tells you when you have entered an incorrect or illogical value, allowing you to catch errors early and preventing needless frustration.    \n\nMULTIPLE DIFFICULTY LEVELS\n\nFive difficulty levels, from easy to insane, ensure that you will be able to find a puzzle that matches your skill level.  With 3,000 total puzzles, you won't run out of puzzles any time soon.\n\nDownload Sudoku Free! for free today and start playing Sudoku the way it was meant to be played!","facts":{"developer_id":289278460,"developer_url":"http://www.optimesoftware.com","first_released":"2010-12-14T21:53:52Z","support_url":"http://www.optimesoftware.com/contact-us","privacy_url":"http://www.optimesoftware.com/privacy/","website_url":"http://www.optimesoftware.com/","app_version":"2.00","release_notes":"• Added support for Autolayout \n• Fixed issues with smart buttons and smart notes \n• Minor bug fixes","rating_current_version":4.55959,"rating_count_current_version":10924,"star_counts":[392,170,538,1657,8167],"genres":["Games","Puzzle","Board","Entertainment"],"languages":["EN"],"content_advisories":null,"device_families":["iphone","ipod"],"chart":null},"freshness":{"apple_read_at":"2026-10-20T19:17:13.816Z","catalog_read_at":"2026-10-20T19:17:13.816Z","reviews_checked_at":"2026-10-19T04:29:11.710Z","summary_written_at":null,"placed_at":"2026-10-15T10:23:36.036Z","scored_at":"2026-10-20T19:48:13.908Z"},"editorial":null,"memberships":[{"list":"sudoku","list_name":"sudoku","list_status":"active","list_url":"https://apptierlist.com/best/sudoku/","position":38,"tier":"C","score":64.4,"components":{"rating":90.6,"votes":82.2,"rank":84.6,"recency":0},"status":"active","review_status":"checked","list_ranking_status":"ranked","confidence":"normal","judged_at":"2026-10-15T10:23:36.036Z"},{"list":"puzzle-games","list_name":"puzzle games","list_status":"active","list_url":"https://apptierlist.com/best/puzzle-games/","position":2260,"tier":null,"score":43.2,"components":{"rating":90.6,"votes":82.2,"rank":0,"recency":0},"status":"active","review_status":"checked","list_ranking_status":"ranked","confidence":"provisional","judged_at":"2026-10-15T10:23:36.036Z"}],"main_list":"sudoku","claim":{"status":"none","verified":false,"site_url":null,"verified_via":null,"verified_domain":null},"history":[{"id":159559,"at":"2026-10-18T07:41:11.705Z","kind":"tier_changed","list":"sudoku","app_store_id":397227037,"app":"sudoku-397227037","from":"D","to":"C","reason":"rank shift: #35, score unchanged at 64.7","job":"rescore"},{"id":133697,"at":"2026-10-16T22:30:13.415Z","kind":"tier_changed","list":"sudoku","app_store_id":397227037,"app":"sudoku-397227037","from":"F","to":"D","reason":"rank shift: #28, score 64.7, tier full (a quarter of the list)","job":"rescore"},{"id":102715,"at":"2026-10-15T10:28:36.039Z","kind":"tier_changed","list":"sudoku","app_store_id":397227037,"app":"sudoku-397227037","from":null,"to":"F","reason":"score 42.9","job":"rescore"},{"id":102351,"at":"2026-10-15T10:23:36.036Z","kind":"membership_added","list":"sudoku","app_store_id":397227037,"app":"sudoku-397227037","from":null,"to":"active","reason":"The app is a sudoku game with 3,000 puzzles, five difficulty levels, notes and error checking.","job":"shadow"},{"id":102350,"at":"2026-10-15T10:23:36.036Z","kind":"membership_added","list":"puzzle-games","app_store_id":397227037,"app":"sudoku-397227037","from":null,"to":"active","reason":"secondary","job":"shadow"},{"id":95002,"at":"2026-10-15T06:27:53.109Z","kind":"app_added","list":null,"app_store_id":397227037,"app":"sudoku-397227037","from":null,"to":null,"reason":"discovered","job":"import"}],"explain":{"method":"Membership is decided by a model judging the App Store listing against the list's definition (and its excludes, for memberships placed or rechecked since they were added to the prompt); 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