Numenera Player’s Guide - Rules of Play says:
Create characters, explore the Ninth World, and learn the basic rules of the Numenera roleplaying game with this player’s guide. It’s perfect for getting a taste of the game, having an extra reference on hand at the gaming table, and building new characters. The guide is an easy-to-access resource for anyone playing Numenera and a wonderful introduction and teaching tool for the game.