A Post-Nuclear Tabletop Roleplaying Game From the introduction: Welcome Vault Dwellers to the Fallout 2d20 Roleplaying Game, Beta Edition. Your vault has been randomly selected to try out this beta version of the post-nuclear roleplaying game. Instead of having to deal with the harsh realities of the Wasteland for real, you can keep yourself entertained and prepare yourselves with this handy Vault-Tec approved game! Fight deadly creatures and discover the post-nuclear America right from the comfort of your Vault!