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There are exactly 5,040 possible 4-digit combinations with unique digits (10×9×8×7). That's fewer than Wordle's 2,315 possible answers!
Numble is based on the classic board game "Mastermind" (1970) and the paper-and-pencil game "Bulls and Cows" from the 19th century.
Playing number puzzles like Numble can improve working memory and logical reasoning skills, according to cognitive science research.
Numble emerged in 2022 as part of the "Wordle clone" phenomenon, but with a mathematical twist. While most spin-offs focused on words, Numble stood out by challenging players' numerical reasoning instead of vocabulary.
Mathematicians have calculated that the best starting numbers are those that maximize information gain. "1234" is popular, but "5689" might be better as it covers higher digits.
Numble has been played in over 150 countries, with teachers using it in classrooms to make math fun. The most active players come from Japan, Germany, and Canada.