The rare daily word game sweeping the globe. Find what's hidden in plain sight.
MUDSTONE
Definition of MUDSTONE
noun
A fine-grained sedimentary rock whose original constituents were clays or muds.
Wiktionary · CC BY-SA
Where it comes from
From mud + stone.
Etymology via Wiktionary (CC BY-SA).
Word DNA
How it is built
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
MUDSTONE in OUTLIER
Players have found it on 10 boards so far. 12 players have found it across Outlier's history.
It first turned up on Day 99, 27 August 2026. The most recent board was Day 167, 3 November 2026. Nobody has seen it on a board for 1 day.
First ever to find it
on Day 99, 27 August 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
MUDSTONE starts with M and ends with E. Sorted, its letters read DEMNOSTU - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
Same letters, different word
One other word uses exactly these letters. Worth knowing at the board: an anagram fits a grid the same way.
Words that start MUDSTO
Its neighbours in the OUTLIER dictionary - shortest first.
Could you have found MUDSTONE?
OUTLIER is a daily word game. One grid, the same grid for everybody, and the words nobody else spots are the ones that pay. This word was on Day 99 - and most players walked straight past it.
Play today's OUTLIER