The rare daily word game sweeping the globe. Find what's hidden in plain sight.
RUBIDIUM
Definition of RUBIDIUM
noun
The chemical element (symbol Rb) with an atomic number of 37. It is a soft, highly reactive alkali metal.
Wiktionary · CC BY-SA
Where it comes from
A New Latin word derived by German chemist R. W. Bunsen in 1861, from Latin rūbidus (“red”) because its spectrum has two red lines.
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.
RUBIDIUM in OUTLIER
Players have found it on 7 boards so far. 14 players have found it across Outlier's history.
It first turned up on Day 30, 19 June 2026. The most recent board was Day 99, 27 August 2026. Nobody has seen it on a board for 3 days.
First ever to find it
on Day 30, 19 June 2026 - before anyone else in Outlier's history. See the Pioneers
Also on
Built from these letters
RUBIDIUM starts with R and ends with M. Sorted, its letters read BDIIMRUU - the shape to hunt for when the grid is scrambled. U and I appear more than once.
Could you have found RUBIDIUM?
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 30 - and most players walked straight past it.
Play today's OUTLIER