Welcome to Rock, Paper, Scissors, Lizard, Spock! Scissors cuts Paper, Paper covers Rock, Rock crushes Lizard, Lizard poisons Spock, Spock smashes Scissors, Scissors decapitates Lizard, Lizard eats Paper, Paper disproves Spock, Spock vaporizes Rock, and as it always has, Rock crushes Scissors. Click your selection.
This project (copied from my old account @wolfmath) uses modular arithmetic in order to determine the winner of the game instead of hardcoding every possible result. Look at the backdrop code for the main logic.