Play Rock
Play Paper
Play Scissors

Welcome to Rock-Paper-Scissors!

From Wikipedia:

Rock-paper-scissors (also known as paper, scissors, stone or other variants) is a hand game usually played between two people, in which each player simultaneously forms one of three shapes with an outstretched hand.

These shapes are:

A player who decides to play rock will beat another player who has chosen scissors ("rock crushes scissors" or sometimes "blunts scissors"), but will lose to one who has played paper ("paper covers rock"); a play of paper will lose to a play of scissors ("scissors cut[s] paper"). If both players choose the same shape, the game is tied and is usually immediately replayed to break the tie.

and they play...
Rock Paper Scissors
If we play... Rock We tie We lose We win
Paper We win We tie We lose
Scissors We lose We win We tie

Originating from China and Japan, other names for the game in the English-speaking world include roshambo and other orderings of the three items, with "rock" sometimes being called "stone".

A chart showing how the three game elements interact

Kitsune-ken was a popular Japanese rock–paper–scissors variant.

Mushi-ken, the earliest Japanese sansukumi-ken game (1809). From left to right: slug (namekuji), frog (kawazu) and snake (hebi).