The document describes a game dynamic called "challenge someone" that can be used for learning and training. It allows players to challenge each other to complete quizzes within a set time limit. This promotes learning through repetition and competition. The game is designed to be social and viral as players select others to challenge. It can be used by companies for sales training, product knowledge, and other areas. Data from real examples showed increased participation, knowledge gains, and comprehension over the course of a training campaign played through the game.