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Nerdle is a math-based word puzzle. You have 6 attempts to guess a hidden 8-character equation. Each guess must be a valid mathematical equation — random character strings are rejected.
Nerdle was created by Richard and Imogen Mann in January 2022, directly inspired by the Wordle phenomenon that swept the internet that month. Richard, a data scientist, swapped Wordle's letters for math equations and released it as a side project.
Within weeks, Nerdle had millions of daily players and spawned dozens of variants: Mini Nerdle (6 chars), Instant Nerdle, and Speed Nerdle. It remains one of the most successful math-focused casual games on the web.