Odds and evens is a simple game of chance and hand game, involving two people simultaneously revealing a number of fingers and winning or losing depending on whether they are odd or even, or alternatively involving one person picking up coins or other small objects and hiding them in their closed hand, while another player guesses whether they have an odd or even number.

[1] This zero-sum game, a variation of the ancient morra and par-impar,[2] is played in Europe, the US, and in Brazil, especially among children.

Odds and Evens (Gerade und Ungerade) is included in the list of games prohibited in Austria-Hungary in 1904 by the Ministry of Justice.

If the result is odd, then the person who called even is the victor, and can decide the issue as they see fit.

The name Even-Odd or EO (Gerade und Ungerade) was even given to a predecessor of roulette in the 18th century.