The rare daily word game sweeping the globe. Find what's hidden in plain sight.
KEYSTONE
Definition of KEYSTONE
noun
The top stone of an arch.
Wiktionary · CC BY-SA
Where it comes from
From key + stone. Definition 4 (retail) possibly originated in the jewelry industry in the magazine called "Jewelers' Circular-Keystone".
Etymology via Wiktionary (CC BY-SA).
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
KEYSTONE in OUTLIER
Players have found it on 10 boards so far. 47 players have found it across Outlier's history.
It first turned up on Day 46, 5 July 2026. The most recent board was Day 98, 26 August 2026. Nobody has seen it on a board for 2 days.
First ever to find it
on Day 46, 5 July 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
KEYSTONE starts with K and ends with E. Sorted, its letters read EEKNOSTY - the shape to hunt for when the grid is scrambled. E appears more than once.
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 KEYSTO
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 46
Could you have found KEYSTONE?
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 46 - and most players walked straight past it.
Play today's OUTLIER