Here we have odd or even.
It is played by two people
The youngest gets to decide if he want of odd or even, and the other person gets the other one.
Then they put their hands behind and say "Odd orrr EVEN" and put forward their hand showing a number of their choice with fingers. If the sum of the numbers is an odd number, the person who chose odd wins, if its even the other wins.
Here is a representation