The rare daily word game sweeping the globe. Find what's hidden in plain sight.
ISOBUTENE
Definition of ISOBUTENE
noun
The unsaturated hydrocarbon methylpropene, (CH3)2C=CH2; used in the manufacture of polybutene and butyl rubber.
Wiktionary · CC BY-SA
Where it comes from
From iso- + butene.
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.
ISOBUTENE in OUTLIER
Players have found it on 13 boards so far. 19 players have found it across Outlier's history.
It first turned up on Day 94, 22 August 2026. The most recent board was Day 157, 24 October 2026. Nobody has seen it on a board for 2 days.
First ever to find it
on Day 94, 22 August 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
ISOBUTENE starts with I and ends with E. Sorted, its letters read BEEINOSTU - the shape to hunt for when the grid is scrambled. E appears more than once.
Words that start ISOBUT
Its neighbours in the OUTLIER dictionary - shortest first.
Could you have found ISOBUTENE?
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 94 - and most players walked straight past it.
Play today's OUTLIER