Connections are a part of many games - for instance tic-tac-toe and Go - but are these connection games? This book, a comprehensive study of the connection game genre, aims to impose some structure on this increasingly large family of games, and to define exactly what constitutes a connection game. The author provides a survey of known connection games while exploring common themes and strategies. Key games, including Hex and Y, are examined in detail and complete rules for over 200 connection games and variants are provided.