Credits
Where our words come from
The dictionaries, word lists and datasets behind the games, who made them, and the terms they are used under.
- FreeDict
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The clues in the crossword, and the meanings in the word tools.
Word definitions licensed from FreeDict.
- VarCon
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Which spellings belong to which dictionary, so a British player is never asked to guess an American spelling.
Copyright 2000–2020 Kevin Atkinson and Benjamin Titze; original word lists copyright 1993 Geoff Kuenning. Free to use, copy, modify, distribute and sell for any purpose, provided the copyright notices are retained.
- CEFR-J and Octanove
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The reading levels behind the estimated bands on the children’s game.
Creative Commons Attribution-ShareAlike 4.0.
- wordfreq and the Google Books Ngram corpus
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How common a word is, which is how the game judges difficulty.
Creative Commons Attribution-ShareAlike 4.0.
The children’s bands are an estimated reading level, not a measured one. They come from a scale built to describe adult language learners, which is the closest openly licensed source that exists — it is a useful ordering and it is not a claim about what any particular child knows.