Clusters Board Game Clusters is an exciting game for 2 to 4 players that will captivate people of all ages. The color-coded tiles have been specifically designed to cover the common combinations of letters found in English. Players discover that words are built with clusters of letters which form the basic spelling and writing rules. Game can be played by a set of rules or by various group activities. Contents include 4 tile racks and 100 tiles. Clusters Board Game can be used on its own, or in conjunction with High Noon Reading Level 1 Independent Reading Kit.