RPS - Linear, Non Linear, Sand Box or what?

For RPS, I believe that the game follows a linear structure. In the game, you have three selections to choose from, and they must be chosen at the same time as your opponent. Sandbox games are more open and give the player more freedom. But RPS follows the same structure in every single game. You don't just choose anything you want for your selection, it must be either rock, paper or scissors. RPS is one game that simply won't work as a sandbox game and must stick to being linear.

According to the rules of the World RPS society, RPS is a game that is played by two players. I personally agree that RPS should remain as a two player game. While a multiplayer system could work, I feel that adding more players adds complications. With two players, everyone understands who wins immediately. With more than two, there are multiple variations of who could possibly win. Everyone must stop, figure out who won and continue. Two players is quite simply easier and quicker.