What is a word ladder?

A word ladder is a chain of real words in which every step keeps the same number of letters and changes exactly one of them. The letter that changes stays in its own place. You do not anagram the word, add a letter, or drop a letter. If the start is COLD, CORD is a legal step because only the third letter moved, and WORD is a legal step from CORD because only the first letter moved. COLD to WORD in one step is not legal, because two letters would have to change at once.

The interesting question is not whether some chain exists. It is how short a chain can be. That shortest length is the par. Par is a count of steps, so a three-word chain such as BAD, BAG, BOG has par 2 if those are the only links, and a four-word chain has par 3. A longer route can still be correct English. It just is not par. Poopleword publishes par from a breadth-first search over a fixed word list. The search is finished before the page is built. The browser does not hunt for a route while you type.

The one-letter rule is small enough to teach and strict enough to make a puzzle. Children can see the changed letter. Adults can argue about whether a shorter route was hiding in the list. Both are looking at the same constraint. That is why the rule has lasted. It does not depend on a picture, a timer, or a private dictionary that changes while you play.

Poopleword uses the rule in four graded ways, and the grades are not the same word list. The classroom pages say which list they use. Mixing them would make a three-letter exercise look broken, because a three-letter word is not a move inside the four-letter game.

The first grade is consonant-vowel-consonant, three letters, from the smaller SCOWL sizes. A real ladder on that list is BAD to BAG to BOG to BOB. Par is 3. Each step is still a three-letter word: the last letter of BAD becomes G, the vowel of BAG becomes O, and the last letter of BOG becomes B. The online practice for this grade checks your guess against the three-letter list only. It does not send BAD through the four-letter engine, and it does not ask you to reach POOP.

The second grade is a four-letter consonant blend. A real ladder is BLAB to BLOB to BLOW to BLEW to BLED. Par is 4. The blend at the start stays long enough for a reader to hear why BL is one onset, then the vowel and the ending move. BLEW is allowed because it is in the four-letter list. The page does not treat the spelling change from BLOW to BLEW as a pronunciation rule. If a pronunciation is shown, it is a CMUdict entry. If CMUdict has no entry, the page says the step is only a spelling change.

The third grade is a long-vowel spelling, still four letters. A real ladder is BABE to BAKE to CAKE to CAGE. Par is 3. The silent E pattern stays visible: BABE, BAKE, and CAKE keep the vowel-consonant-E shape while one letter moves. CAGE changes the ending. This is a spelling ladder. It is not a claim that every letter change is a sound change. English spelling does not work that cleanly, and the page does not pretend it does.

The daily game is a fourth use of the same rule, with a different target. Every public puzzle ends at POOP. The start word is chosen from words whose shortest path to POOP is 4, 5, 6, or 7 steps, and the published path uses only words from SCOWL size 50 or smaller. Size 55 and size 60 words stay legal plays. They are not used to pad a daily start or its published path. Puzzle number 001 is the launch game date, 14 November 2026, the first game date at 08:00 UTC. The number goes up by one at each later game date. A date before that launch has no number. The site does not invent puzzles before the launch game date.

You play the daily ladder by changing one letter at a time, including the first step away from the start. A guess must be the same length. If it is shorter or longer, the game says to enter a word of that length. If the letters are not in the list, the game says it is not in the word list. If you submit the same word, it says you changed nothing. If two or more letters differ, it says to change exactly one. Yellow marks the letter that moved. Green marks a letter that stayed. The goal row is the ink-colored POOP.

Hints come in three grades and then stop. The first hint is a count: how many listed words sit one letter away from your current row. The second hint names the position of the letter that changes on one shortest next step, and it does not name the new letter. The third hint adds only the first letter of that step. It does not spell the rest of that word, and another press does not open the solution. The hint page reveals those grades one at a time. It does not print the finished ladder. The answer page does, after the fact, with par and a short commentary.

When you finish, the result shows the step count, par, and the path you actually played. Matching par means your chain is as short as the build-time search on this list. Finishing in more steps is still a finish. The result also names the position of each changed letter. Where CMUdict has a pronunciation for both words, those pronunciations are quoted and described only as the sounds this step involves. They are not rewritten into a story about roots, and a changed letter is not treated as a sound rule. A rhyme set of three to five words is taken from the start word or from POOP, and it is labeled as the same ending letters, not as a historical word family. If a pronunciation is missing, the sentence says the step is a spelling exercise and does not invent a root.

The share text is the brand, the puzzle number, and your steps over par, then one row of yellow and white squares for each step. The squares show which position changed. They do not contain the letters, so a share does not hand the path to someone who has not played. The Share button uses the device share sheet when the browser offers one. Otherwise it copies the text. If copying fails, the same text stays on the page and the note says the copy failed. A Play Unlimited link sits next to that button and does not change the daily streak.

The game date is not your laptop’s local midnight. Poopleword changes it at 08:00 UTC. That cut is this site’s rule. poople.io has not published it as an official time. A player of this site in New York and a player of this site in Tokyo who press submit at the same instant are on the same puzzle, because they share this list and this clock. Daylight saving time does not move the cut, because the cut is a UTC hour, not a civil midnight. An old browser tab that still shows yesterday cannot turn a finish into today’s streak. The finish has to belong to the game date the tab was actually playing. Completing the same day twice does not add a second win. A missed day breaks the streak. Looking at the answer, the hint, or Unlimited does not add a win. Unlimited ladders do not touch the streak at all.

Streak, games played, best step count, and the step distribution live in localStorage under one key. The fields are a version number, the last played date, today’s path, the streak, games played, best steps, and the distribution. The stored record also keeps the last completed date, whether today is already complete, and how many hints were used, because those are what stop a double count. There is no account behind them. Clearing site data clears the streak. A damaged value, or a record whose version is not the current one, is discarded and the page starts today’s path over rather than crashing. That discard is honest about the loss. It does not reconstruct a streak that is no longer in the browser.

Unlimited mode is the same four-letter list and the same target, POOP, with three pools measured on the real graph. Easy starts are 3 or 4 steps away. Medium starts are 5 or 6. Hard starts are 7 or more. The pools are not labels pasted on at random. A word is easy only if its shortest path has that length. The default example on the Unlimited page is one of those real starts, with its par printed in the page. Asking for another puzzle walks the pool by a counter. It does not search.

The solver is a lookup, not a second search engine. At build time the word list is turned into tables that, for a start word and a goal word, name the next step of one shortest path. The tables are split by the first letter of the start so the browser can fetch one shard. Playing the daily puzzle never needs that fetch. The solver page opens on today’s start and on POOP, and it also shows three real examples: an easy path, a medium path, and a hard path. There is no page of bulk query parameters and no list of every future answer.

Future daily puzzles are determined by a public seed, the date, and the pool. Publishing every future answer URL would turn the archive into a spoiler list. The answer archive therefore runs from the launch game date through the current game date and no further. Each of those days has its own page, with the start, the par, one shortest path, a commentary between 150 and 250 words, and links to the previous and next published day when they exist. The first day has no previous page. A day that has not started has no page.

There is no 1877 edition of this game. What Carroll did say, in the letter printed in Vanity Fair on 29 March 1879, was that “just a year ago last Christmas” two young ladies had asked him for riddles, and that he had devised a puzzle instead. That letter is his later claim about Christmas 1877. It is not a publication date. Wikipedia’s account of the word ladder attributes the Christmas 1877 invention claim to Carroll and, separately, dates the first diary mention to 12 March 1878, when he called the game Word-links and described it as a game for two players.

The Green Bag’s 2007 note on Doublets quotes the same diary point: a 12 March 1878 entry is where Charles Dodgson, writing under the name readers know as Lewis Carroll, first recorded the invention he then called Word Links and soon renamed Doublets. The Green Bag also points out that Carroll himself allowed he might not have been the first person to have the idea. Poopleword does not need him to be first. The rule is what matters, and the rule is documented.

The public debut is firmer than the Christmas story. Vanity Fair printed “A New Puzzle” on 29 March 1879. The preface of the 1879 book Doublets, a Word-Puzzle, reprinted by the Lewis Carroll texts project, says that article appeared on that date. Carroll’s rules, in that text, are the rules still used here. Two words of the same length are linked by other words. Each word differs from the next in one letter only. Letters are not rearranged. Each keeps its place. His printed example runs HEAD, HEAL, TEAL, TELL, TALL, TAIL. He called the end words a doublet, the interposed words links, and the whole series a chain.

Vanity Fair then set weekly doublets, beginning with puzzles such as driving PIG into STY, raising FOUR to FIVE, and making WHEAT into BREAD, and opened a scored competition on 19 April 1879. A shorter chain scored better. That is par, under another name. Macmillan issued the 1879 book collecting the puzzle. Later printings and an 1880 pamphlet repeat the preface. None of those dates is a Christmas 1877 printing. When a modern write-up moves the magazine debut back to that Christmas, it has collapsed Carroll’s recollection into a publication. The diary, the magazine, and the book do not support that collapse.

Those sources are public. The diary point is reported by Wikipedia’s word-ladder article and by the Green Bag, volume 10, number 4. The 29 March 1879 Vanity Fair text and the HEAD to TAIL chain are in the transcription of Doublets, a Word-Puzzle. Carroll’s own letter is the source of the Christmas claim. This page is not repeating a blog that forgot to distinguish them.

In a phonics lesson the ladder is a way to hold a pattern still while one grapheme moves. A CVC chain keeps the vowel frame obvious. A blend chain lets the onset stay put for a few steps so BL or CL is not a mystery letter. A long-vowel chain lets students see the silent E while the consonant changes. The teacher can ask which letter changed, not “what does this word secretly mean.” Meaning can be discussed when the word is a word the class knows. It should not be invented to make a ladder sound historical.

A useful classroom hour looks like this. Start with the three-letter chain and have students mark the changed letter in yellow and the kept letters in green, which is the same marking as the daily game. Read the words aloud from a known pronunciation list if you have one. If you do not, say the spelling and do not guess a sound. Then move to the blend chain and ask the class to predict only the first letter of a legal next word, which is the same information as the third hint. Then show the long-vowel chain and ask whether the silent E stayed. Finish by looking at one daily puzzle without showing the path: the start, the par, and the target POOP. Students who want the path can earn it by playing, or they can read it the next day on the answer page.

Printed worksheets follow those three grades. Each PDF states the start, the goal, the par, and the word length, leaves lines for the chain, and puts the answer on a following page. The CVC sheet is three letters. The blend sheet and the long-vowel sheet are four letters. The matching page on this site plays the same start and goal on the matching list. Printing the PDF and then practicing online is the same puzzle, not two approximate puzzles.

The four-letter list this site chose is SCOWL, Kevin Atkinson’s Spell Checker Oriented Word Lists, revision 2020.12.07, using the english and american word files from size 10 through size 60. SCOWL includes the public-domain ENABLE and 12dicts material and adds its own license notice, which travels with the copy in this project. Sizes 70, 80, and 95 are left out, as are the proper-name files, the abbreviation files, and the upper-case files. Size 60 is already broad. It includes some archaic and unusual words. Those words can be legal plays. A daily start and its published path stay inside size 50, so the ladder is not padded with an uncommon word just to keep a count. Words that cannot reach POOP by one-letter steps are not offered as starts. POOP itself is in the list, and the playable set is the connected component around it. This is Poopleword’s chosen list, with the version and the filters stated here. It is not poople.io’s dictionary, and it is not a worldwide standard. Par is the shortest path in this list only. Players of this site still share one list, so they share one daily puzzle.

That component is what the measured pools describe. The site reports the counts from the build rather than a wish that the list be “about three thousand.” A new checkout can rerun the generator and read the report. The daily pool, the easy pool, the medium pool, and the hard pool are slices of those measured distances. If a pool were empty the build would fail. It is not empty.

Pronunciations, when shown, come from the CMU Pronouncing Dictionary. The license file for that dictionary is vendored with the subset this site uses. A missing word is a missing entry, not an invitation to coin a pronunciation. The same restraint applies to etymology. This site does not own a historical dictionary of roots, so it does not fabricate one. Same ending letters are a spelling observation. They are labeled that way.

Poopleword is a separate game from poople.io. The shared joke of the target word is not a partnership, a data feed, or an endorsement. The footer says the same thing because readers land on more than one page. Nothing here copies that site’s puzzles, timing, or copy. The accepted words and the shortest answers are not claimed to match. If you play both, you are playing two games.

The site is English, for the United States spelling list described above. It does not ask you to sign in, pay, or sync a phone. It does not run ads. Progress stays in the browser that played. That is a limitation as well as a choice. A new phone does not inherit a streak, and the site will not pretend that it did.

If you want to practice without the daily lock, use Unlimited or a worksheet. If you want today’s shortest path explained, use the answer page after you have played, or the solver if you mean to look it up. If you want the rule and its history in one place, you are already on it. The daily puzzle is the front page, and it starts at the start word, not at a slogan.

Play today’s ladder or print a grade from the worksheets.