This isn't the original Barricade game, as the source code for it has been lost for ages, but based on all the hype this is what we think it must have been like.
Anyone can host their own Barricade server with their own custom rules and tournament setup. Just reach out to story through the Assayer to let them know you would like to host a barricade game.
Barricade is an opportunity to go ham with all of your crazy foam dart gun and boffer shenanigans without having to worry about physical harm to your character. Safety rules and weapon guidelines still apply, but all other combat rules are suspended in Barricade. The combat rules (and any cheat codes) are determined by the person hosting the server.
Common ways to play the game are similar to team pvp matches in your favorite FPS shooter game.