Word Ladder

WORD LADDER

Word Ladder — Wordle Esperanto

Turn one word into another one letter at a time, every rung a real word. A new ladder daily in 52 languages. Free, no app, no sign-up.

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Ludreĝimoj

Kiel ludi Word Ladder

Word Ladder is Lewis Carroll's Doublets, one puzzle a day. You are given two words of the same length and you get from one to the other by changing a single letter at a time, with every word along the way a real word of the language. Par — the shortest ladder that exists — is shown as a score, not a requirement: any legal chain wins, and you have par plus four steps to find one. Undo lifts a wrong rung back off the board but does not refund the step. A new ladder every day in each of 52 languages, drawn from that language's own word list rather than translated from English, with the full solution verified before the puzzle ships.

How Word Ladder works

Two words, one letter at a time, every step a real word.

From cold to warm in 4 steps.

The start word sits at the top of the board and the goal word is pinned underneath it. Type a word that differs from the rung above by exactly one letter and it joins the ladder; keep going until you reach the goal. The letters never move position and the word never changes length — the only move in the game is swapping one tile for another.

The rules, unchanged since 1877

  • Every rung has the same number of letters as the start word. Nothing is ever added or removed.
  • Exactly one position changes per step, and the other letters stay where they are. Rearranging them is a different game.
  • Every rung has to be a real word in the language you are playing. Proper nouns are out, as they have been since Lewis Carroll set the rules.
  • A word already on the board is refused, and costs you nothing. Revisiting a rung can never shorten a ladder.

Par is a score, not a gate. Every puzzle ships with the length of its shortest possible ladder — that is par. You do not have to find it: any legal chain that reaches the goal wins the day, and the endgame shows your route beside the shortest one so you can see where they parted. What you do have is a budget of par plus four. Run past it and the day is lost.

Undo takes the rung back, not the step. A wrong turn is not a dead end: undo lifts the top rung off the board so you can try another route. It does not refund the step, though, because a free undo is just a search algorithm with extra clicks.

A new ladder every day in each of 52 languages — built from that language's own word list, with the whole solution verified before the puzzle ever ships.

Konsiloj kaj strategio

1
Work from both ends

Nothing says you have to think forwards. Ask what could come immediately before the goal word — usually only a handful of words can — and you have turned one long search into two short ones that meet in the middle.

2
Move the vowels first

Consonant frames are stubborn and vowels are cheap. A swap in a vowel slot almost always lands on another real word, which makes vowel positions the reliable way to travel while you work out which consonant has to give.

3
Count the letters that must change

Compare the start and the goal position by position. The number of differences is the absolute floor on par — a ladder can never be shorter than that — and it tells you immediately which tiles are already where they need to be.

4
A detour is not a mistake

Par plus four exists because the direct route is often blocked. Changing a letter that already matches the goal, to get somewhere the next step needs, is frequently the only way through and costs you one step out of four.

5
Spend undo late, not early

The step is gone either way, so there is no hurry to take a rung back the moment it looks unpromising. Push one more word out of it first — a rung that looked like a detour is often the pivot the rest of the ladder hangs on.

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What is a word ladder?
A word ladder turns one word into another by changing a single letter at a time, with every step along the way a real word — COLD, CORD, CARD, WARD, WARM. Lewis Carroll invented the puzzle as Doublets at Christmas 1877 and published the rules in 1879; they have not needed changing since.
Do I have to find the shortest ladder?
No. Any legal chain that reaches the goal word wins the day. The shortest possible ladder is shown as par so you have something to measure against, and the endgame shows it beside your own route — but a longer route that works is still a win, not a bug.
How many steps do I get?
Par plus four. Par varies between four and six steps depending on the day, so the budget is eight to ten rungs. Four spare steps is enough to take two wrong turns and back out of both of them.
What happens when I undo?
The top rung comes off the board and you can try a different word from the one below it. The step is not refunded: undo is there so a wrong turn isn't a dead end, not so you can search the dictionary for free.
Can I use any real word, or only common ones?
Any word in that language's word list works as a rung. Only the two endpoints are drawn from the curated common-word tier, so the puzzle always starts and ends somewhere you recognise, while the route through the middle is as wide as the language allows.
Which languages can I play it in?
52 of our 91. A language ships when one rendered tile is the unit a step changes and its word graph is dense enough at a fixed length to build years of puzzles. That rules out the abugidas and Thai, Khmer, Burmese and Vietnamese, where a word's length in tiles varies, and Chinese, where a tile is a whole morpheme. A handful of alphabetic languages — Greek and Irish among them — are out for now only because their word lists are still too sparse.
Is every puzzle actually solvable?
Yes, and provably so. Each day's pair ships with a complete verified ladder between them, built offline and re-checked against the live word list before the puzzle is served. A pair whose route cannot be walked is never dealt.

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