Rock Paper Scissors
Play rock–paper–scissors vs the computer.
What is this?
Rock Paper Scissors lets you pick Rock (✊), Paper (✋), or Scissors (✌) and play against the computer. Rock beats Scissors, Scissors beats Paper, Paper beats Rock, and matching picks are a draw.
How to use it
Pick Rock, Paper, or Scissors and both hands shake with a "Rock… Paper… Scissors!" cue before revealing at the same time. The winning hand is highlighted, and your win/draw/loss record accumulates below.
Fair & private
The computer's pick uses the browser's cryptographic random generator (crypto) with rejection sampling to remove modulo bias, giving Rock, Paper, and Scissors exactly equal odds. Nothing is ever sent to a server.
Why there's no winning strategy — Nash equilibrium
Rock beats Scissors, Scissors beats Paper, and Paper beats Rock — a circular structure with no single move that always wins. In game theory, playing each option with exactly a 1/3 chance at random is the game's Nash equilibrium: no matter what the opponent does, this mix can never be exploited over the long run. Conversely, any habit of favoring one move becomes a liability the moment an opponent notices it.
Humans can't play truly random — first-move bias
Unlike a computer, real players struggle to keep a perfect 1/3 random mix. Multiple informal studies report a common tendency to open with Rock, often explained by Rock's psychological association with "strength" and how a clenched fist flows naturally from a starting gesture. Exploiting this human bias is a real tactic in player-vs-player matches, but this tool's computer pick uses a cryptographic random generator, so no such bias exists here.