Quad-S, the Strategic Starship Skirmish System, is a spaceship combat board game unlike any other on the market by using a 'modular' rules system. Each race plays by their own rules and can be used as a stand alone game. This spaceship combat game has a focus on capital ships. Each race book has a set of self contained rules, there is no base book.Quad S Evolution, the second edition of the game, now comes in one book with all the races inside. Also comes with a CD with all the counters and control sheets included. - BoardGameGeek