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1. 0.3.122026-10-20
   • Đã đổiWhere the app would show an ad, the game now shows the Play Sudoku page on Google Play instead. The one for hints gives you the hint after 3 seconds, as in the app
   • Đã đổiThe ad space on the difficulty pages now holds a Google Play link to the Play Sudoku app
   • Đã đổiThe Google Play button is now Google's official badge, in the page's language
2. 0.3.112026-10-20
   • MớiThe game on the home page is now the same game as the Play Sudoku app for Android. Boards you were solving and shared links still open on the difficulty pages (/easy …)
3. 0.3.102026-10-19
   • Đã đổiThe privacy policy now covers the Play Sudoku app for Android: Google AdMob ads, the Remove ads purchase and usage statistics. The web game here has no app ads and works as before
4. 0.3.92026-09-24
   • MớiEach level now has its own address. Open /expert and an expert puzzle starts right away, with the techniques that level adds listed below
   • MớiTwo new guides: how the levels are graded, with figures measured on 60 puzzles per level, and when and how to write notes
   • Đã đổiArriving through a level address keeps the puzzle you were solving. Only a puzzle you haven't touched is swapped for one at that level
   • Đã đổiThe typeface is now Onest. Digits come out almost exactly as tall and wide as on the sudoku.com grid
5. 0.3.82026-09-16
   • Đã đổiThe on-screen wording and the hint sentences are shorter and plainer, and the pages now use the same words the buttons do
   • Đã đổiThe daily, tournament and awards pages are about half as long. The streak rule, how scores add up and what earns a medal are all still there
   • Đã sửaThe about page said there were no leaderboards and that hints are never rationed. The tournament has standings, and you get three hints per game
   • Đã sửaThe tournament description only said you race a field of 100. It now says the other 99 players are simulated
   • Đã sửaWhen your hints ran out, the game told you to start a new game or restart. It now points at “With the coach”, which keeps the puzzle you are on
6. 0.3.72026-09-13
   • MớiEntering a number or note now makes a short sound. You can turn it off and back on in Settings
   • Đã sửaThe Q shortcut for Quick entry now works: press Q, pick a digit, then press Enter to place it
7. 0.3.62026-09-13
   • Đã sửaWhen the hint got stuck it told you to press Check — there is no Check button. It now says to clear the wrong numbers first
   • Đã sửaThe tournament runs for a month, but the line at the end called it this week's
   • Đã sửaNaked pair and triple hints named the row twice: r5c2 and r5c4 already say row 5. Seven lines in ten read that way
   • Đã đổiWhen the hint runs out of ideas it no longer lists all thirteen technique names. The names live on the How to solve page
   • Đã đổiHow to solve is now in the top bar. The only way in to the thirteen techniques used to be one line at the foot of the page
8. 0.3.52026-09-12
   • MớiThere is a With the coach mode now. Hints without a limit, and three mistakes no longer end the game — it is a place to learn the techniques
   • MớiRun out of hints and a With the coach button appears right there. It keeps the puzzle you are on and lifts the limit
   • MớiSettings now has a Dark screen switch. It darkens the board and the whole page, and carries over to the other pages
   • MớiFilling a row, column, or box with 1 through 9 now makes those nine cells pop in turn. A unit with a repeated digit stays still
   • MớiFinishing a puzzle now names the badge you just earned, right there. You no longer have to open the awards page to find out
   • Đã đổiThe finished grid now gets 0.6 seconds of its own before the result window opens — a ripple spreads from the cell you filled last
   • Đã đổiThe result window now shows what this game added: how many you have solved, and how many days you are on
   • Đã đổiThe result window now also shows the points you have piled up this month. The number above is this puzzle; the line below is everything added up
   • MớiFourteen badges became twenty-one. Twenty-five, two hundred and five hundred puzzles, plus a two-week streak, so the next rung is closer
   • MớiThree badges now come from points earned. Points grow faster on harder levels, so it is a different path from the puzzle-count badges
   • Đã đổiThe main button on the result window is now Play again. It opens the next puzzle at the same level straight away, with no second pick
   • Đã đổiThe dark colours were measured, not guessed. The tightest pair — an entered number on the selected cell — sits at 5.09:1
   • Đã đổiThe next puzzle is now built while you solve. Play again opens instantly, even on Very hard, with no waiting screen
   • MớiFinishing a puzzle now remembers which technique decided it. The How to play page shows how many of the thirteen you have met, and which one comes next
   • MớiOne more badge, twenty-two now. It lights up when you have met all thirteen techniques — the practice puzzles on each technique page are the way there
   • Đã đổiThe board diagrams on the technique pages follow the dark screen too. The dimmed cells and the highlighted line got their own dark colours
   • MớiThe technique pages now say where you are too — whether you have met this one, or how many of the thirteen you have met so far
   • Đã sửaFixed the run-together text at the top of the technique pages: it read difficultyHard instead of difficulty Hard
   • Đã đổiA coached game is kept out of your records, score and tournament. A time set with unlimited help would not mean anything
9. 0.3.42026-09-12
   • MớiThere is a contact page now. The link at the bottom of every page opens it, and leaving an address gets you an answer
   • Đã đổiThe contact form moved out of the about page and onto its own. You no longer scroll past the essay to reach it
10. 0.3.32026-09-11
    • Đã đổiA pasted link now shows the board rather than the name — one box lit, and inside it only one cell where the 8 can go
    • Đã sửaThe tab icon was blank in Safari and could not appear in Google results — Google does not accept SVG icons
11. 0.3.22026-09-09
    • Đã đổiThree blocks came off the front page: the one about hints, the list of features, and the one about difficulty. What sits under the board is a third of what it was, and the hint and difficulty explanations are still on the how-to-play and about pages
    • Đã đổiDropped the paragraph about the record living in this browser from the awards, daily and tournament pages. The same thing was said on all three, and none of it helps while you are playing
    • MớiYou can add this to your home screen now. The tab icon was also still magenta from an older palette; it matches the site again
    • MớiA line above the board now shows your best time at this level and your run of days. On a phone the records table sits off-screen, so you never saw it until you finished
    • MớiA link you share now shows your time as a picture. It used to be the same image whichever puzzle you solved
    • Đã sửaThe clock starts when you first touch the board. It used to run while you were still reading, so new times may look faster than your old ones
    • MớiOpen a link a friend sent and their time comes with it. When you finish, the two times sit side by side
    • MớiA link you share now unfurls in chat with the level and your time on it. Opening it drops the other person straight onto that board
    • MớiThe window that appears when you solve a puzzle can now share the result. On a phone it opens the system share sheet; otherwise the line and the link are copied
    • MớiPaste a link to this site into a chat or a post and it now shows a picture of a grid. It used to be text only
    • Đã đổiThe first screen paints sooner. Pages that are not in Korean were pulling down 282 pieces of a Korean webfont before anything could be drawn; now only the Korean pages do
    • Đã sửaThe site name sits at the far left again. On narrow screens the menu button had been pushing it out of place
    • Đã sửaThe menu button has a bigger area to hit. The icon looks the same, but the target went from 22px to 44px, so it is harder to miss with a thumb
12. 0.3.12026-09-07
    • Đã sửaFixed a case where finishing after midnight, with the tab left open, was counted as today. The board in your hands is yesterday's, so it no longer extends the run.
    • Đã sửaFixed the game page scrolling sideways on a phone. Invisible tooltips were still taking up space.
    • Đã đổiPages got a little lighter. Developer comments that never showed on screen were being shipped with them.
13. 0.3.02026-09-06
    • Đổi tiêu chíEvery puzzle is now checked at build time to be solvable by logic to the last cell, and only those go out. Four out of five expert boards used to leave you guessing partway
    • Đã đổiA puzzle number opens a different board than before, because the way boards are built changed
    • MớiA progress bar appears while a board is being built. It shows up only when the search runs long, and says how many boards have been checked
    • Đã sửaThe screen no longer freezes while a board is built. You can pick another difficulty mid-search
    • Đã đổiMuted text is darker. Labels, the status line and notes went from 4.1:1 contrast to 5.1:1
    • Đã sửaThe “OFF” pill on the notes button is readable. White on grey measured 2.05:1
    • Đã đổiThe count of remaining digits moved below the number, not beside it. On phones the small “5” next to “1” read as 15
    • Đã đổiBoard digits are slightly larger, matched by measuring letter heights against the site we compare with
    • Đã đổiMistakes, time and the buttons split the row above the board into equal thirds. The clock and the buttons used to sit on top of each other
    • Đã đổiThe site is called Play Sudoku, at play-sudoku.co
    • Đã sửaAbout, privacy, terms and the changelog now exist in each language. Following them from the English pages no longer drops you into Korean
    • MớiTraffic measurement is on. It records which pages were viewed; the board you are solving and your time are never sent
    • MớiA solver arrived. Type in the board you are stuck on and it hands you one step at a time, each with the reason
    • MớiA printable page arrived. Up to six boards at once, each carrying its number so you can reopen it here when paper runs out of help
    • Đã đổiAn inquiry is now kept as a post only the operator can read. It used to try to send mail, and without the setup it went nowhere
    • MớiGerman arrived — the hint sentences too, not just the buttons: “Im Block oben Mitte kann die 3 nur in r3c5 stehen”
    • Đã đổiThe language picker is a dropdown now. With eighteen languages planned, a row of names would fill the footer
    • MớiSpanish arrived — the hint sentences too: “En el bloque superior central, el 3 solo puede ir en r3c5”
    • MớiThe awards page now lists your months. Each one shows how many daily puzzles you finished, and months you skipped stay on the shelf as empty cards
    • MớiFinish the daily puzzle on every day of a month and that month gets a trophy
    • MớiFinished tournaments now carry a medal — gold for the top 10%, silver for 25%, bronze for 50%
    • Đã đổiThere are fourteen badges now. A full month and Medallist joined the list
    • MớiFrench arrived — the hint sentences too: “Dans le bloc en haut au centre, le 3 ne peut aller qu'en r3c5”
    • MớiItalian arrived — the hint sentences too: “Nel blocco in alto al centro, il 3 può andare solo in r3c5”
    • MớiPortuguese arrived — the hint sentences too: “No bloco superior central, o 3 só pode ir para r3c5”
    • MớiSimplified Chinese arrived — the hint sentences too: “在上中宫里，3 只能填在 r3c5”
    • MớiRussian arrived — the hint sentences too: “В блоке сверху по центру цифра 3 может стоять только в r3c5”
    • MớiPolish arrived — the hint sentences too: “W bloku u góry pośrodku cyfra 3 może stać tylko w r3c5”
    • MớiTurkish arrived — the hint sentences too: “Üst orta blokta 3 yalnızca r3c5 hücresine girebilir”
    • MớiVietnamese arrived — the hint sentences too: “Ở khối trên giữa, số 3 chỉ có thể vào ô r3c5”
    • MớiThai arrived — the hint sentences too: “ในบล็อกบนกลาง เลข 3 ลงได้เฉพาะที่ช่อง r3c5”
    • Đã sửaA row with no numbers in it no longer collapses. On a 500px board that row was only 17px tall
    • MớiThe rules page now explains with board diagrams — four topics, from the last free cell to notes, with the notes drawn inside the cell
    • MớiArabic arrived — the hint sentences too: “في المربع العلوي الأوسط، لا يمكن للرقم 3 أن يقع إلا في الخانة r3c5”
    • Đã đổiThe Arabic pages read right to left. The board and the number pad stay as they are — one puzzle number must not draw a different picture in each language
    • Đã sửaTable headings now use the body font. The monospace face carries no Arabic, so its letters were pulled apart into fixed-width cells
    • MớiAll thirteen technique pages now carry a board diagram, with the notes drawn where the technique needs them
    • Đã sửaThe Y-Wing hint now names the wing that matches the pivot's value. Half the time it said “if the pivot is 1” about the wing with no 1 in it
    • Đã sửaThe small pencil marks in the explanation diagrams no longer get clipped on a phone, and the diagrams are bigger
14. 0.2.02026-09-05
    • MớiThe board now carries four readouts: score, difficulty, mistakes and time. The icon beside the clock pauses
    • MớiA digit that does not match the answer turns red on the spot and is counted, up to three. At three the board stops
    • MớiSettings arrived. Highlight the row, column and box; highlight the same digit; flag duplicates; count mistakes; quick entry; auto notes — six switches
    • MớiYour score climbs as you play: difficulty multiplier × (10 per correct cell − 20 per mistake − 30 per hint), plus a time bonus once you finish
    • Đã đổiEight buttons became four. Undo, erase, notes and hint stay on the row; quick entry and auto notes moved into settings
    • Đã đổiNew games are picked from a list that opens under the button. The warning that your progress will be lost can be turned off with “don't ask again”
    • Đã đổiFinishing a puzzle opens a panel with the difficulty, your time and your score
    • Đã đổiThe hint icon carries the number you have left
    • Đã đổiThe board and its digits are larger — up to 500px wide, with 42px digits on the number pad, so your eyes work less
    • Đã đổiThe selected cell is light blue and its row, column and box are a pale blue-grey. Where you are looking is now obvious at a glance
    • Đã đổiThe thick lines that split the 3×3 boxes and the thin ones between cells are different colours, so the nine blocks read first
    • Đã đổiThe accent colour moved from magenta to blue, and the header is now white
    • Đã đổiDigits are set in Roboto. Korean is drawn in the device's own font, so nothing heavy is downloaded
    • Đã đổiDifficulty is chosen from the row above the board. “New game” opens a list attached to the button
    • MớiA rules page arrived, covering the three rules and what row, column, box, clue and candidate mean
    • MớiAn awards page arrived. Twelve badges come from finishing each difficulty, from puzzle counts, from day streaks and from your times
    • MớiA daily-challenge calendar arrived. It shows which days you solved, month by month, and a past date opens that day's puzzle
    • Đã đổiDays you solved the daily puzzle are kept for 400 days. Only the last one used to survive, so the calendar lit a single square
    • Đã đổiThere is no leaderboard on awards or the daily challenge. Nothing is sent to a server, so there is nothing to compare against
    • MớiA tournament arrived. Three boards — medium, hard and expert — and everyone who comes that week plays the same three
    • MớiFinishing a tournament board records your time, and finishing all three shows the total. A replay only replaces the record if it was faster
    • Đã đổiThe header and the tab row beneath it became one row. Forty vertical pixels went away and the board rose by that much
    • Đã đổiOn narrow screens the menu folds into a hamburger. It closes on Esc or a tap outside, so it never sits over the board
    • Đã đổiThe board is 20px larger on phones. The side margins were narrowed to use more of the screen
    • Đã đổiUndo, erase, notes and hint have wider touch targets on phones. The icons are the same size; only the misses went away
    • Mới“How to solve” gained a table that finds a technique from what you are seeing, so it is usable at the moment you are stuck
    • Mới“Rules” now names the four things beginners actually trip on: guessing, skipping notes, reading only cells, and forgetting the box
    • MớiThe daily-challenge page now says that solving a past date neither fills the calendar nor extends a streak. That was written nowhere before
    • MớiThe tournament page now gives an order for the three boards and three ways to cut your time
    • MớiThe awards page explains how the time badges are earned: they look at your best time, so one good run lights them for good
    • Đã sửaLeaving a finished board and coming back gives you a fresh puzzle at the same difficulty, not the completed one
    • Đã sửaArriving on a link with a puzzle number and then picking a new game keeps the new one. A refresh used to snap back to the first puzzle
    • MớiA puzzle you have already solved is not handed to you again. This browser remembers the last 300
    • Đã sửaA hint is counted only when you place it. Opening one and closing it with “leave it” costs nothing
    • Đã đổiHints come in three pages — where to look, why, then what to place — so the answer does not arrive first
    • Đã sửaPlacing a digit or undoing closes an open hint. An explanation that no longer matched the board used to stay on screen
    • Đã sửaThe hint card opens over the number pad. On small screens it sat below the fold, so pressing hint looked like it did nothing
    • Đã đổiOpening a hint dims the board and leaves only the cells it points at lit. Where to look now arrives through the eyes
    • Đã đổiThe difficulty row is labelled “Difficulty:” and the current one wears a blue pill. Colour alone was hard to spot
    • Đã đổiOn wide screens the header and footer line up with the board's width instead of spreading to the edges of the screen
    • Đã đổiType is bigger: hint titles 13→19px, hint text and the note under the board 13→15px, the clock 15→16px
    • Đã đổi“How to solve” moved from the header to the footer. The header keeps only the ways back to the game
    • MớiThe tournament runs monthly. A hundred players including you, with the time left counting down by the second
    • MớiTournament points come from every board you finish that month, not only the three set boards
    • Đã đổiThe players on the leaderboard are invented by this browser. The top 1% is paced at about one puzzle an hour
    • Đã đổiThe “redo · check · restart · settings” row under the board is gone. Restart lives inside “new game”, settings under the gear beside the clock
    • Đã đổiAll hundred scores are visible on the leaderboard, and opening it scrolls to your place
    • Đã đổiBetween 20% and 40% of entrants do not show up in a given month — people who register and never come are left as they are
    • MớiWhere you placed in past tournaments is kept. The awards page groups them by year and month
    • Đã đổiThree mistakes ends the game and sends you to a new board; there is no second chance. A limit you can undo is not a limit
    • Đã đổiPlayers carry names. They are handles like Comet and Lumen, never people's names
    • MớiThe time left sits beside “Daily” and “Tournament” in the menu — midnight, and the last night of the month
    • Đã đổiThe tournament moved from weekly to monthly. Weekly meant that someone arriving on a Sunday saw a contest a few hours long
    • MớiHovering an icon button says what it does: undo, erase, notes, hint, pause and settings
    • Đã sửaThe settings, erase and undo icons were redrawn. Settings looked like a sun, and the eraser's underline had come loose
15. 0.1.02026-09-05
    • MớiSudoku opened. Four difficulties, no login, nothing to install
    • MớiHints give the reasoning instead of the answer — “7 fits only here in row 3” — and light the cells the reasoning rests on
    • MớiPlacing a digit clears it from the notes in the same row, column and box. You no longer erase twenty cells by hand
    • MớiUndo and redo go all the way back, one note at a time
    • MớiClose the tab and the puzzle is still there. It is kept in the browser and never sent to a server
    • MớiOn wide screens the number pad and hints sit beside the board, so reading a hint costs no scrolling
    • MớiTurn on “quick entry” to pick a digit once and then tap cells. Filling many cells with one digit stops being a round trip
    • MớiPause and restart arrived. Pausing covers the board — stopping the clock while the answer stays visible is not a pause
    • MớiA record panel sits under the board: best time and count per difficulty, and how many days in a row you have played
    • MớiAn “expert” difficulty arrived. The median backtrack count rises from 109 at “very hard” to 824
    • Đã sửaDifficulty labels were corrected. Some boards were graded up merely for having many empty cells
    • Đã đổi“Fill notes” became “auto notes”. Left on, it recomputes the candidates after every move
    • Đã sửaCandidates removed by a hint no longer come back with auto notes. Progress like “the 4 in this box is on this line only” used to vanish every move
    • MớiEvery puzzle carries a number. Pass on the number or the link and someone else plays the same board
    • MớiPrinting gives you the board and its number, so you can solve on paper and reopen it by number
    • MớiHint techniques went from five to nine, adding hidden pairs, naked triples, hidden triples and X-Wing
    • Đã sửaThe next hint remembers the candidates already removed. The same elimination used to be offered again and again
    • Đổi tiêu chíDifficulty is now the hardest technique the puzzle needs. The label says what it asks of you — “Medium · up to hidden singles”
    • Đổi tiêu chíUp to “very hard”, following the hints reaches the end. “Expert” boards need more than the nine techniques
    • MớiA daily puzzle arrived. The date is the puzzle number, so everyone plays the same board that day
    • Đã đổiThe day streak counts the daily puzzle only. A number you build by tapping one easy board a day means nothing
    • MớiThe site opens without a connection. One visit and the browser keeps the game and the writing
    • MớiEvery technique has its own page, so arriving from a search like “sudoku X-Wing” gives you the worked sentences
    • MớiEach technique page links four boards where that technique is the decisive one, to play right after reading
    • MớiHint techniques went from nine to twelve, adding Y-Wing, simple colouring and Swordfish
    • Đã đổiSome “expert” boards can now be explained to the end. Every one of them used to fall outside our techniques
    • Đã đổi“Hidden single” was split into scanning a box and scanning a line. The logic is the same; the work your eyes do is not
    • Đã sửaDifficulty labels were corrected. Some boards said “up to pointing pairs” while actually needing naked triples