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We review flagged puzzles by hand.","reportPlaceholder","What's wrong — ambiguous, broken, wrong answer…","describeProblem","Describe the problem","submitReport","Submit report","comments","Comments","noComments","No comments yet","noCommentsHint","Be the first to say something about this puzzle.","addComment","Add a comment…","addCommentLabel","Add a comment","postComment","Post comment","anonymous","Anonymous","delete","Delete","report","Report","reported","Thanks — reported.","commentReportPlaceholder","What's wrong with this comment…","board","The board","boardHelp","Click a cell to rule a pairing out, again to claim it. Claiming one clears its row and column for you. Your board is kept on this device.","checkBoard","Check the board","placed","{{placed}} of {{total}} placed","clearBoard","Clear the board","solved","Solved. Every pairing is right.","wrongCells","{{wrong}} of {{total}} cells are not right yet.","Puzzles · QED Night","Browse the collection: solver-verified logic puzzles by default, with labeled archive imports one checkbox away.","title","The Collection","intro","Every logic puzzle here is machine-checked by a solver before it is published: one provable solution, no ambiguous clues. Classic imports from the public domain are labeled until they pass review.","search","Search puzzles…","difficulty","Difficulty","any","language","Language","includeUnreviewed","Include unreviewed imports","submit","Search","filterByType","Filter by type","all","All","tagged","Tagged","clear","showing","Showing {{shown}} of {{total}} puzzles","noMatch","No puzzles match these filters.","widen","Try widening the type or difficulty.","widenUnreviewed","Try widening the type or difficulty, or tick “Include unreviewed imports” above to search the whole archive.","dedicated","Or browse a dedicated page:","previous","← Previous","page","page {{page}}","next","Next →","upsellLine","Premium unlocks the full archive.","upsellNote","You're seeing the most-recent window of puzzles. Premium is currently operator-granted while checkout is being built.","logic_grid",{"_221":254,"_154":255,"_223":256,"_225":257,"_227":258},"zebra",{"_221":249,"_154":250,"_223":251,"_225":252,"_227":253},"knights_knaves",{"_221":244,"_154":245,"_223":246,"_225":247,"_227":248},"math",{"_221":239,"_154":240,"_223":241,"_225":242,"_227":243},"brain_teaser",{"_221":234,"_154":235,"_223":236,"_225":237,"_227":238},"lateral",{"_221":229,"_154":230,"_223":231,"_225":232,"_227":233},"riddle",{"_221":222,"_154":222,"_223":224,"_225":226,"_227":228},"crumbHome","Home","crumbPuzzles","Puzzles","empty","Nothing here right now — check back soon.","Showing {{shown}} of {{total}}","about","About {{name}}","browseAll","Browse all {{name}} with search and filters →","nav","Riddles","meta","Classic short-form riddles — mostly public-domain imports, labeled until they pass review.","p1","This is the site's collection of classic short-form riddles — the \"what am I\" format, usually solved through wordplay or a shift in perspective rather than deduction.","p2","Most of what's here is drawn from public-domain sources. A riddle that has not yet been checked by hand for accuracy and a single clean answer carries an \"unreviewed import\" label. That's an honest state, not a hidden one: the label is on every card, and none of these are run through the constraint solver the site's logic puzzles are, since a riddle's answer isn't the kind of thing that format checks.","Lateral thinking","Lateral Thinking Puzzles","Situation puzzles solved by asking yes-or-no questions — a strange scenario is presented, and exactly one hidden fact resolves it.","A lateral thinking puzzle — also called a situation puzzle — presents an odd scenario and lets you ask yes-or-no questions to work out what actually happened. Exactly one hidden fact resolves the situation; the puzzle is solvable in roughly ten good questions, no wordplay or supernatural twist required.","These are collected and curated rather than solver-verified — there's no constraint-satisfaction structure to prove a unique solution against, the way there is for the site's logic grid, zebra, and knights-&-knaves puzzles — so lateral thinking puzzles carry no ∎ badge. Each card shows whether it's reviewed or an unreviewed import.","Brain teasers","Brain Teasers","Short puzzles that reward a flash of insight rather than a long derivation — brain teasers that don't fit the site's more specific logic-puzzle categories.","Brain teasers are the catch-all for puzzles that reward a moment of insight rather than a methodical derivation — the kind where the trick, once seen, makes the rest obvious. They don't require the yes/no interrogation of a lateral-thinking puzzle or the wordplay of a riddle; they're closer to a compact \"aha\" problem.","This is a curated collection, not a solver-verified one — brain teasers don't reduce to the kind of constraint-satisfaction problem the site's logic grids, zebra puzzles, and knights-&-knaves puzzles are checked against, so they carry no ∎ badge. Each card shows whether it's a reviewed puzzle or an unreviewed import.","Math puzzles","Math Puzzles","A collection of number and arithmetic-reasoning puzzles — the answer is a number or short calculation, not a spatial arrangement.","Math puzzles here are number and arithmetic-reasoning problems — the answer comes out of a calculation or a chain of numeric logic, not a spatial arrangement like a zebra puzzle or a matching like a logic grid.","These aren't run through the constraint solver the site's logic-grid, zebra, and knights-&-knaves puzzles are — a numeric answer isn't the kind of thing that format proves unique — so they don't carry the ∎ verified badge. Some in this collection are reviewed and confirmed; others are still labeled as unreviewed imports until they've been checked by hand, and each card says which.","Knights & knaves","Knights & Knaves Puzzles","Solver-verified knights and knaves puzzles — an island where knights always tell the truth and knaves always lie. Work out who's who from what they say, with exactly one solution proven per puzzle.","Knights and knaves puzzles come from a format popularized by logician Raymond Smullyan: on this island, every islander is either a knight, who always tells the truth, or a knave, who always lies. You're given a handful of statements — often islanders talking about each other — and have to work out who's a knight and who's a knave from what's consistent.","Every knights-and-knaves puzzle here is checked by a constraint solver before it's published, which tries every possible assignment of knight/knave and confirms exactly one is consistent with every statement. The ∎ verified badge means that check ran and passed, not that we think the puzzle reads well.","Zebra puzzles","Zebra Puzzles","Solver-verified zebra puzzles in the classic Einstein's Riddle format — deduce a full row of houses, neighbors, and attributes from a list of clues with exactly one solution.","A zebra puzzle is the classic \"Einstein's Riddle\" format: a row of houses, seats, or positions, each with several attributes, and a list of clues that pin down who or what belongs where. The positional structure — first house, next to, two doors down — is what separates a zebra puzzle from a logic grid: here, order matters.","Every zebra puzzle here runs through a constraint solver before publication. It checks every possible arrangement of the row and confirms exactly one satisfies every clue — the same proof-before-publish standard the site's logic grid and knights-&-knaves puzzles carry, shown as the ∎ verified badge on each card.","Logic grids","Logic Grid Puzzles","Solver-verified logic grid puzzles: match people, items, and attributes from a list of clues. Exactly one arrangement satisfies every clue, proven before publication.","A logic grid puzzle gives you a set of clues about several people or things, each with a handful of attributes — who owns what, who did which job, who arrived when — and asks you to work out the complete matching. Unlike a zebra puzzle, there's no row or sequence to place anyone in: you're matching categories to each other, not lining anyone up.","Every logic grid puzzle here runs through a constraint solver before it's published. The solver checks every possible matching and confirms exactly one of them satisfies all the clues — the puzzle only goes live once that's proven, not assumed. That's what the ∎ verified badge on each card means.","metaTitleN","Daily Challenge #{{n}} — QED Night","Daily Challenge — QED Night","Today's QED Night daily puzzle — one puzzle, one day, a shared leaderboard.","ogAlt","QED Night Daily Challenge","none","No challenge today","noneHint","Check back at 00:00 UTC for the next one.","browseArchive","Browse the puzzle archive →","Daily Challenge #{{n}}","yourTime","Your time","start","Start today's puzzle","starting","Starting…","clockNote","The puzzle and the clock arrive together: your time starts when you press Start, not when you open this page.","signInToSave","Sign in to save your streak and rank.","allTime","All-time leaderboard →","Your answer to today's puzzle","Submit","notQuiteLeft_one","Not quite, {{count}} try left.","notQuiteLeft_other","Not quite, {{count}} tries left.","Not quite, try again.","serverTime","Your final time is measured on the server.","Reveal (counts as used)","Solved","onTheVine_one","day on the vine","onTheVine_other","days on the vine","best","best {{best}}","hintsUsed","Hints used","outOfTries","Out of tries — here's how it went","outOfTriesBody","💡{{hints}} hints used. Come back tomorrow for a fresh puzzle.","Today's leaderboard","boardEmpty","Be the first to solve today","boardEmptyHint","Solve today's puzzle to open the board.","rank","Rank","solver","Solver","time","Time","yourRank","Your rank — #{{rank}} · {{time}} · 💡{{hints}}","Today's puzzle is in English. Translated dailies arrive as puzzles are translated and reviewed.","date","2026-10-19","entries",[],"puzzle",{"_330":331,"_332":333,"_154":334,"_335":336,"_337":204,"_160":338,"_66":49,"_339":340,"_341":49,"_163":21,"_342":343,"_344":345,"_346":347,"_348":349},"theme","","attempt","id","01a09647-9cbb-7dc5-845c-059bf5b49ecd","slug","the-crowded-hair-count-761fa2","The Crowded Hair Count","body","At noon on census day, a city has more than one million residents. Imagine that every resident’s scalp hairs could be counted perfectly at that exact moment. Some residents may have none, while no resident has more than 150,000 hairs.\n\nWithout knowing anything about hairstyles, age, or hair loss, can you be certain that at least two residents have exactly the same number of scalp hairs? 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No download, no account.","sortLabel","Order","sortFeatured","Recommended","sortHot","Popular","sortNew","Newest","sortTop","Top rated","mobile","Works on phones","count","Games: {{count}}","Page {{page}}","prev","Previous page","Next page","No games here yet.","play","Play","playNow","Play now","loading","Loading the game…","fullscreen","Full screen","exitFullscreen","Leave full screen","theater","Wide view","like","I like it","dislike","Not for me","favorite","Add to my games","unfavorite","Remove from my games","share","Share","shareCopied","Link copied","Report a problem","Thanks — we will look at it","rating","{{rating}} out of 10","votes","Votes: {{count}}","noRating","Not rated yet","About this game","controls","How to play","faq","Questions","related","More like this","developer","Made by {{name}}","deadTitle","This game is no longer here","deadBody","Its makers took it down. Here are games like it.","players","Players","worksOn","Works on","phone","Phone","computer","Computer","embedNote","Made by another studio and played here in a safe frame; it may show its own ads.","breadcrumbHome","Games","Free online games to play tonight — QED Night","Play free online games in your browser at QED Night: chess, xiangqi, caro and Werewolf with friends, a puzzle every day, and new games added every day. No download, no account.","h1","Free online games for tonight","tagline","Play in your browser: classics with friends, a puzzle every day, new games every day. No download, no account.","heroDaily","Today's puzzle","heroDailyBody","One puzzle, the same for everyone today.","heroStory","Tonight's story","heroStoryBody","Five minutes to read aloud.","heroRoom","Play with a friend","heroRoomBody","Open a room and send the link.","aboutTitle","About QED Night","aboutBody","QED Night is a place to play together in the evening. Every game here runs in the browser, on a computer or a phone. Our own games — chess, xiangqi, caro, Werewolf and more — open a private room you share with one link, with rules the server checks for you. Every game we add from other studios is played by a person before it goes up. A new puzzle every day, a short story every night, and new games every day.","intents","What are you in the mood for?","featured","Tonight","new","New today","originals","QED Originals · play with friends","hot","Popular right now","seeAll","See all","continue","Continue playing","Scroll back","Scroll on","QED Original","New","Hot","updated","Updated","multiplayer","With friends","desktopOnly","Computer only","label","Search games","placeholder","Search 15 games and more…","noResults","No game matches “{{q}}”.","See every result","Games matching “{{q}}”","Type the name of a game, or a kind of game.","Search games — QED Night","primary","Main","New games","story","Leaderboards","Categories","account","Account","signIn","Sign in","teamBuild","Team build","collapse","Collapse the menu","expand","Open the menu","menu","Menu","closeMenu","Close menu","site",{"_366":832,"_425":833},{"_575":164,"_828":829,"_830":831},{"_814":815,"_816":817,"_818":819,"_820":821,"_154":822,"_823":824,"_425":825,"_826":827},"footer",{"_217":806,"_807":808,"_809":810,"_811":812,"_327":813},{"_800":801,"_802":803,"_804":805},{"_601":784,"_785":786,"_787":788,"_789":790,"_791":792,"_406":793,"_794":795,"_796":797,"_798":799},"puzzleType",{"_208":778,"_196":779,"_206":780,"_202":781,"_204":782,"_200":244,"_198":783},{"_342":765,"_766":767,"_768":769,"_770":771,"_772":773,"_774":775,"_776":777},"reward",{"_752":753,"_754":755,"_756":757,"_758":759,"_760":761,"_16":762,"_763":764,"_299":300},"badges",{"_747":748,"_749":750,"_575":751},"auth",{"_746":746},"premium",{"_744":745},"grid",{"_737":737,"_738":739,"_740":741,"_742":743},{"_681":682,"_683":684,"_685":686,"_687":688,"_689":690,"_691":692,"_693":694,"_636":695,"_696":697,"_698":699,"_700":701,"_702":703},"englishPage","This page is in English. The site's games and menus are in your language; long texts like this one are translated later.","iq",{"_35":674,"_37":675,"_154":676,"_677":678,"_679":680},{"_23":634,"_16":635,"_636":637,"_638":639,"_640":641,"_642":643,"_644":645,"_646":647,"_648":649,"_650":651,"_522":652},{"_154":633,"_171":449},"Play next",{"_154":673},"🔥 {{n}} days","minesweeper",{"_154":670,"_671":672},"twenty48",{"_154":668,"_666":669},"chessPuzzles",{"_154":665,"_666":667},"storm",{"_154":660,"_661":662,"_663":664},"duel",{"_154":653,"_654":655,"_656":657,"_658":659},"button","Share result","copied","Copied","fallback","Select and copy your result","the computer ({{level}})","QED Night · {{game}}","win","🏆 Beat {{against}}","loss","Lost to {{against}}","draw","🤝 Drew with {{against}}","QED Night · Puzzle Storm","line_one","⚡ {{count}} puzzle · best combo {{combo}}","line_other","⚡ {{count}} puzzles · best combo {{combo}}","QED Night · Chess puzzles","line","Rating {{rating}} · solved {{solved}}/{{tried}}","QED Night · 2048","🏆 {{score}} · best tile {{best}}","QED Night · Minesweeper ({{size}})","boom","💥 Boom","QED Night Daily #{{n}}","IQ-style test — QED Night","A timed reasoning-and-math challenge — for practice and entertainment, not a clinical assessment.","IQ-style test","closedError","The IQ test is closed while its questions are rebuilt.","closed","The IQ test is closed while we rebuild it. 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One of you is guessing.","Werewolf","4 to 12 players","Hidden roles, one village, and an argument you have out loud.","Eights","2 to 6 players","Match the suit or the rank, name a suit on a wild, empty your hand first.","Puzzle co-op","2 to 8 players","Solve a run of proven puzzles together, one locked answer at a time.","Minesweeper","solo","The classic, timed, with a board the server keeps honest.","Checkers","2 players","English draughts: jump when you can, crown on the last row.","Xiangqi","Chinese chess across the river, with a 10+5 clock.","puzzlesLabel","Solve endgame studies","puzzlesNote","tablebase endings, one move to find","Connect Four","Drop, stack, and read three moves ahead.","Othello","Flip the board in your favour before the last square falls.","Caro","Five in a row on a 15 by 15 board. Vietnamese rules by default.","Chess","Bullet to classical, with premoves and a proper clock.","Slide, merge, and see how far the board lets you go.","unknown","no","ruled out","yes","matched","section","{{a}} by {{b}}","checkoutNote","Premium is currently operator-granted while checkout is being built.","or","emptyTitle","No badges yet","emptyHint","Badges appear here as puzzles are solved and streaks build.","Badges earned","levelUp","Level up","level","Level {{level}}","levelBody","A new rank, earned by solving. Onward.","badge","Badge unlocked","tier","{{tier}} tier","Streak","daysStreak"," day streak","∎ verified","verifiedTitle","Verified — unique solution","unreviewed","unreviewed import","unreviewedTitle","A classic import that has not passed review yet — its solution is not machine-checked","untitled","Untitled puzzle","solvedBy","Solved by {{pct}}% of {{attempts}}","median"," · median {{minutes}} min","Riddle","Logic grid","Lateral","Math","Brain teaser","Zebra","Account menu for {{name}}","menuWaiting_one","Account menu for {{name}}, {{count}} friend request waiting","menuWaiting_other","Account menu for {{name}}, {{count}} friend requests waiting","dashboard","Dashboard","profile","My profile","Friends","waiting","{{count}} waiting","admin","Admin console","logout","Log out","light","Light","dark","Dark","system","System","About","contact","Contact","terms","Terms","privacy","Privacy","Theme","unreachable","Cannot reach the server","unexpected","Something went wrong.","unreachableServer","Cannot reach server","notFoundTitle","404","Error","notFound","The requested page could not be found.","Back home","roomRefused","The room refused that.","suggest","View QED Night in {{language}}","dismiss","No thanks","QED Night","QED Night, home"]