Tauntless Rock Paper Scissors
Team Fortress 2 has a taunt that allows players to play a game of Rock, Paper, Scissors that kills the loser. This can be used for settling player discussions and contest. The problem is that the taunt is an in-game item, therefore not available to all players.
TRPS was a player request to alleviate this, and allow all players to use RPS within the game's chat.
Players can send game requests to each other, choose their action, and the winner is signified with particle engines.