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1. 0.3.122026-10-20
   • เปลี่ยนWhere 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
   • เปลี่ยนThe ad space on the difficulty pages now holds a Google Play link to the Play Sudoku app
   • เปลี่ยนThe Google Play button is now Google's official badge, in the page's language
2. 0.3.112026-10-20
   • ใหม่The 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
   • เปลี่ยนThe 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
   • ใหม่Each level now has its own address. Open /expert and an expert puzzle starts right away, with the techniques that level adds listed below
   • ใหม่Two new guides: how the levels are graded, with figures measured on 60 puzzles per level, and when and how to write notes
   • เปลี่ยนArriving through a level address keeps the puzzle you were solving. Only a puzzle you haven't touched is swapped for one at that level
   • เปลี่ยนThe 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
   • เปลี่ยนThe on-screen wording and the hint sentences are shorter and plainer, and the pages now use the same words the buttons do
   • เปลี่ยนThe 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
   • แก้ไขThe about page said there were no leaderboards and that hints are never rationed. The tournament has standings, and you get three hints per game
   • แก้ไขThe tournament description only said you race a field of 100. It now says the other 99 players are simulated
   • แก้ไขWhen 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
   • ใหม่Entering a number or note now makes a short sound. You can turn it off and back on in Settings
   • แก้ไขThe Q shortcut for Quick entry now works: press Q, pick a digit, then press Enter to place it
7. 0.3.62026-09-13
   • แก้ไขWhen the hint got stuck it told you to press Check — there is no Check button. It now says to clear the wrong numbers first
   • แก้ไขThe tournament runs for a month, but the line at the end called it this week's
   • แก้ไขNaked pair and triple hints named the row twice: r5c2 and r5c4 already say row 5. Seven lines in ten read that way
   • เปลี่ยนWhen the hint runs out of ideas it no longer lists all thirteen technique names. The names live on the How to solve page
   • เปลี่ยนHow 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
   • ใหม่There 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
   • ใหม่Run out of hints and a With the coach button appears right there. It keeps the puzzle you are on and lifts the limit
   • ใหม่Settings now has a Dark screen switch. It darkens the board and the whole page, and carries over to the other pages
   • ใหม่Filling 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
   • ใหม่Finishing a puzzle now names the badge you just earned, right there. You no longer have to open the awards page to find out
   • เปลี่ยนThe finished grid now gets 0.6 seconds of its own before the result window opens — a ripple spreads from the cell you filled last
   • เปลี่ยนThe result window now shows what this game added: how many you have solved, and how many days you are on
   • เปลี่ยนThe 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
   • ใหม่Fourteen badges became twenty-one. Twenty-five, two hundred and five hundred puzzles, plus a two-week streak, so the next rung is closer
   • ใหม่Three badges now come from points earned. Points grow faster on harder levels, so it is a different path from the puzzle-count badges
   • เปลี่ยนThe 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
   • เปลี่ยนThe dark colours were measured, not guessed. The tightest pair — an entered number on the selected cell — sits at 5.09:1
   • เปลี่ยนThe next puzzle is now built while you solve. Play again opens instantly, even on Very hard, with no waiting screen
   • ใหม่Finishing 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
   • ใหม่One 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
   • เปลี่ยนThe board diagrams on the technique pages follow the dark screen too. The dimmed cells and the highlighted line got their own dark colours
   • ใหม่The 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
   • แก้ไขFixed the run-together text at the top of the technique pages: it read difficultyHard instead of difficulty Hard
   • เปลี่ยนA 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
   • ใหม่There is a contact page now. The link at the bottom of every page opens it, and leaving an address gets you an answer
   • เปลี่ยนThe 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
    • เปลี่ยนA pasted link now shows the board rather than the name — one box lit, and inside it only one cell where the 8 can go
    • แก้ไขThe 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
    • เปลี่ยนThree 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
    • เปลี่ยนDropped 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
    • ใหม่You can add this to your home screen now. The tab icon was also still magenta from an older palette; it matches the site again
    • ใหม่A 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
    • ใหม่A link you share now shows your time as a picture. It used to be the same image whichever puzzle you solved
    • แก้ไขThe 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
    • ใหม่Open a link a friend sent and their time comes with it. When you finish, the two times sit side by side
    • ใหม่A 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
    • ใหม่The 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
    • ใหม่Paste 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
    • เปลี่ยนThe 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
    • แก้ไขThe site name sits at the far left again. On narrow screens the menu button had been pushing it out of place
    • แก้ไขThe 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
    • แก้ไขFixed 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.
    • แก้ไขFixed the game page scrolling sideways on a phone. Invisible tooltips were still taking up space.
    • เปลี่ยนPages got a little lighter. Developer comments that never showed on screen were being shipped with them.
13. 0.3.02026-09-06
    • เปลี่ยนเกณฑ์Every 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
    • เปลี่ยนA puzzle number opens a different board than before, because the way boards are built changed
    • ใหม่A 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
    • แก้ไขThe screen no longer freezes while a board is built. You can pick another difficulty mid-search
    • เปลี่ยนMuted text is darker. Labels, the status line and notes went from 4.1:1 contrast to 5.1:1
    • แก้ไขThe “OFF” pill on the notes button is readable. White on grey measured 2.05:1
    • เปลี่ยนThe count of remaining digits moved below the number, not beside it. On phones the small “5” next to “1” read as 15
    • เปลี่ยนBoard digits are slightly larger, matched by measuring letter heights against the site we compare with
    • เปลี่ยนMistakes, 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
    • เปลี่ยนThe site is called Play Sudoku, at play-sudoku.co
    • แก้ไขAbout, privacy, terms and the changelog now exist in each language. Following them from the English pages no longer drops you into Korean
    • ใหม่Traffic measurement is on. It records which pages were viewed; the board you are solving and your time are never sent
    • ใหม่A solver arrived. Type in the board you are stuck on and it hands you one step at a time, each with the reason
    • ใหม่A 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
    • เปลี่ยนAn 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
    • ใหม่German arrived — the hint sentences too, not just the buttons: “Im Block oben Mitte kann die 3 nur in r3c5 stehen”
    • เปลี่ยนThe language picker is a dropdown now. With eighteen languages planned, a row of names would fill the footer
    • ใหม่Spanish arrived — the hint sentences too: “En el bloque superior central, el 3 solo puede ir en r3c5”
    • ใหม่The 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
    • ใหม่Finish the daily puzzle on every day of a month and that month gets a trophy
    • ใหม่Finished tournaments now carry a medal — gold for the top 10%, silver for 25%, bronze for 50%
    • เปลี่ยนThere are fourteen badges now. A full month and Medallist joined the list
    • ใหม่French arrived — the hint sentences too: “Dans le bloc en haut au centre, le 3 ne peut aller qu'en r3c5”
    • ใหม่Italian arrived — the hint sentences too: “Nel blocco in alto al centro, il 3 può andare solo in r3c5”
    • ใหม่Portuguese arrived — the hint sentences too: “No bloco superior central, o 3 só pode ir para r3c5”
    • ใหม่Simplified Chinese arrived — the hint sentences too: “在上中宫里，3 只能填在 r3c5”
    • ใหม่Russian arrived — the hint sentences too: “В блоке сверху по центру цифра 3 может стоять только в r3c5”
    • ใหม่Polish arrived — the hint sentences too: “W bloku u góry pośrodku cyfra 3 może stać tylko w r3c5”
    • ใหม่Turkish arrived — the hint sentences too: “Üst orta blokta 3 yalnızca r3c5 hücresine girebilir”
    • ใหม่Vietnamese arrived — the hint sentences too: “Ở khối trên giữa, số 3 chỉ có thể vào ô r3c5”
    • ใหม่Thai arrived — the hint sentences too: “ในบล็อกบนกลาง เลข 3 ลงได้เฉพาะที่ช่อง r3c5”
    • แก้ไขA row with no numbers in it no longer collapses. On a 500px board that row was only 17px tall
    • ใหม่The rules page now explains with board diagrams — four topics, from the last free cell to notes, with the notes drawn inside the cell
    • ใหม่Arabic arrived — the hint sentences too: “في المربع العلوي الأوسط، لا يمكن للرقم 3 أن يقع إلا في الخانة r3c5”
    • เปลี่ยนThe 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
    • แก้ไขTable headings now use the body font. The monospace face carries no Arabic, so its letters were pulled apart into fixed-width cells
    • ใหม่All thirteen technique pages now carry a board diagram, with the notes drawn where the technique needs them
    • แก้ไขThe 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
    • แก้ไขThe 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
    • ใหม่The board now carries four readouts: score, difficulty, mistakes and time. The icon beside the clock pauses
    • ใหม่A digit that does not match the answer turns red on the spot and is counted, up to three. At three the board stops
    • ใหม่Settings arrived. Highlight the row, column and box; highlight the same digit; flag duplicates; count mistakes; quick entry; auto notes — six switches
    • ใหม่Your score climbs as you play: difficulty multiplier × (10 per correct cell − 20 per mistake − 30 per hint), plus a time bonus once you finish
    • เปลี่ยนEight buttons became four. Undo, erase, notes and hint stay on the row; quick entry and auto notes moved into settings
    • เปลี่ยนNew 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”
    • เปลี่ยนFinishing a puzzle opens a panel with the difficulty, your time and your score
    • เปลี่ยนThe hint icon carries the number you have left
    • เปลี่ยนThe board and its digits are larger — up to 500px wide, with 42px digits on the number pad, so your eyes work less
    • เปลี่ยนThe 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
    • เปลี่ยนThe thick lines that split the 3×3 boxes and the thin ones between cells are different colours, so the nine blocks read first
    • เปลี่ยนThe accent colour moved from magenta to blue, and the header is now white
    • เปลี่ยนDigits are set in Roboto. Korean is drawn in the device's own font, so nothing heavy is downloaded
    • เปลี่ยนDifficulty is chosen from the row above the board. “New game” opens a list attached to the button
    • ใหม่A rules page arrived, covering the three rules and what row, column, box, clue and candidate mean
    • ใหม่An awards page arrived. Twelve badges come from finishing each difficulty, from puzzle counts, from day streaks and from your times
    • ใหม่A daily-challenge calendar arrived. It shows which days you solved, month by month, and a past date opens that day's puzzle
    • เปลี่ยนDays you solved the daily puzzle are kept for 400 days. Only the last one used to survive, so the calendar lit a single square
    • เปลี่ยนThere is no leaderboard on awards or the daily challenge. Nothing is sent to a server, so there is nothing to compare against
    • ใหม่A tournament arrived. Three boards — medium, hard and expert — and everyone who comes that week plays the same three
    • ใหม่Finishing a tournament board records your time, and finishing all three shows the total. A replay only replaces the record if it was faster
    • เปลี่ยนThe header and the tab row beneath it became one row. Forty vertical pixels went away and the board rose by that much
    • เปลี่ยนOn narrow screens the menu folds into a hamburger. It closes on Esc or a tap outside, so it never sits over the board
    • เปลี่ยนThe board is 20px larger on phones. The side margins were narrowed to use more of the screen
    • เปลี่ยนUndo, erase, notes and hint have wider touch targets on phones. The icons are the same size; only the misses went away
    • ใหม่“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
    • ใหม่“Rules” now names the four things beginners actually trip on: guessing, skipping notes, reading only cells, and forgetting the box
    • ใหม่The daily-challenge page now says that solving a past date neither fills the calendar nor extends a streak. That was written nowhere before
    • ใหม่The tournament page now gives an order for the three boards and three ways to cut your time
    • ใหม่The awards page explains how the time badges are earned: they look at your best time, so one good run lights them for good
    • แก้ไขLeaving a finished board and coming back gives you a fresh puzzle at the same difficulty, not the completed one
    • แก้ไขArriving 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
    • ใหม่A puzzle you have already solved is not handed to you again. This browser remembers the last 300
    • แก้ไขA hint is counted only when you place it. Opening one and closing it with “leave it” costs nothing
    • เปลี่ยนHints come in three pages — where to look, why, then what to place — so the answer does not arrive first
    • แก้ไขPlacing a digit or undoing closes an open hint. An explanation that no longer matched the board used to stay on screen
    • แก้ไขThe hint card opens over the number pad. On small screens it sat below the fold, so pressing hint looked like it did nothing
    • เปลี่ยนOpening a hint dims the board and leaves only the cells it points at lit. Where to look now arrives through the eyes
    • เปลี่ยนThe difficulty row is labelled “Difficulty:” and the current one wears a blue pill. Colour alone was hard to spot
    • เปลี่ยนOn wide screens the header and footer line up with the board's width instead of spreading to the edges of the screen
    • เปลี่ยนType is bigger: hint titles 13→19px, hint text and the note under the board 13→15px, the clock 15→16px
    • เปลี่ยน“How to solve” moved from the header to the footer. The header keeps only the ways back to the game
    • ใหม่The tournament runs monthly. A hundred players including you, with the time left counting down by the second
    • ใหม่Tournament points come from every board you finish that month, not only the three set boards
    • เปลี่ยนThe players on the leaderboard are invented by this browser. The top 1% is paced at about one puzzle an hour
    • เปลี่ยนThe “redo · check · restart · settings” row under the board is gone. Restart lives inside “new game”, settings under the gear beside the clock
    • เปลี่ยนAll hundred scores are visible on the leaderboard, and opening it scrolls to your place
    • เปลี่ยนBetween 20% and 40% of entrants do not show up in a given month — people who register and never come are left as they are
    • ใหม่Where you placed in past tournaments is kept. The awards page groups them by year and month
    • เปลี่ยนThree 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
    • เปลี่ยนPlayers carry names. They are handles like Comet and Lumen, never people's names
    • ใหม่The time left sits beside “Daily” and “Tournament” in the menu — midnight, and the last night of the month
    • เปลี่ยนThe tournament moved from weekly to monthly. Weekly meant that someone arriving on a Sunday saw a contest a few hours long
    • ใหม่Hovering an icon button says what it does: undo, erase, notes, hint, pause and settings
    • แก้ไขThe 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
    • ใหม่Sudoku opened. Four difficulties, no login, nothing to install
    • ใหม่Hints give the reasoning instead of the answer — “7 fits only here in row 3” — and light the cells the reasoning rests on
    • ใหม่Placing a digit clears it from the notes in the same row, column and box. You no longer erase twenty cells by hand
    • ใหม่Undo and redo go all the way back, one note at a time
    • ใหม่Close the tab and the puzzle is still there. It is kept in the browser and never sent to a server
    • ใหม่On wide screens the number pad and hints sit beside the board, so reading a hint costs no scrolling
    • ใหม่Turn on “quick entry” to pick a digit once and then tap cells. Filling many cells with one digit stops being a round trip
    • ใหม่Pause and restart arrived. Pausing covers the board — stopping the clock while the answer stays visible is not a pause
    • ใหม่A record panel sits under the board: best time and count per difficulty, and how many days in a row you have played
    • ใหม่An “expert” difficulty arrived. The median backtrack count rises from 109 at “very hard” to 824
    • แก้ไขDifficulty labels were corrected. Some boards were graded up merely for having many empty cells
    • เปลี่ยน“Fill notes” became “auto notes”. Left on, it recomputes the candidates after every move
    • แก้ไขCandidates 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
    • ใหม่Every puzzle carries a number. Pass on the number or the link and someone else plays the same board
    • ใหม่Printing gives you the board and its number, so you can solve on paper and reopen it by number
    • ใหม่Hint techniques went from five to nine, adding hidden pairs, naked triples, hidden triples and X-Wing
    • แก้ไขThe next hint remembers the candidates already removed. The same elimination used to be offered again and again
    • เปลี่ยนเกณฑ์Difficulty is now the hardest technique the puzzle needs. The label says what it asks of you — “Medium · up to hidden singles”
    • เปลี่ยนเกณฑ์Up to “very hard”, following the hints reaches the end. “Expert” boards need more than the nine techniques
    • ใหม่A daily puzzle arrived. The date is the puzzle number, so everyone plays the same board that day
    • เปลี่ยนThe day streak counts the daily puzzle only. A number you build by tapping one easy board a day means nothing
    • ใหม่The site opens without a connection. One visit and the browser keeps the game and the writing
    • ใหม่Every technique has its own page, so arriving from a search like “sudoku X-Wing” gives you the worked sentences
    • ใหม่Each technique page links four boards where that technique is the decisive one, to play right after reading
    • ใหม่Hint techniques went from nine to twelve, adding Y-Wing, simple colouring and Swordfish
    • เปลี่ยนSome “expert” boards can now be explained to the end. Every one of them used to fall outside our techniques
    • เปลี่ยน“Hidden single” was split into scanning a box and scanning a line. The logic is the same; the work your eyes do is not
    • แก้ไขDifficulty labels were corrected. Some boards said “up to pointing pairs” while actually needing naked triples