Blocks have small, random variations from these dimensions so as to create imperfections in the stacking process and make the game more challenging.

A block may be touched or nudged to determine whether it is loose enough to remove without disturbing the rest of the tower, but it must be returned to its original position if the player decides to move a different one.

A turn ends when the next player in sequence touches the tower or when 10 seconds have elapsed since the placement of a block, whichever occurs first.

[4] A British national, Scott was born in Tanganyika, now Tanzania, where she was raised speaking English and Swahili, before moving to live in Ghana, West Africa.

The blocks of the first sets of Jenga were manufactured for Scott by the Camphill Village Trust in Botton, Yorkshire.

[6] In 1984, Robert Grebler, an entrepreneur from California who was the brother of a close friend of Scott, contacted her and expressed interest in importing and distributing Jenga in Canada.

[8] Pokonobe then licensed Irwin Toy to sell Jenga in Canada and to be master licensee worldwide.

Grebler built the tower in 1985 while playing with an original Jenga set produced by Leslie Scott in the early 1980s.

In addition, there have been a number of collector edition Jenga games, featuring the colors and logos of the Boston Red Sox, Las Vegas Raiders, New York Yankees, and John Deere, among others.

There are Jenga Giant variations which can reach 5 feet (150 cm) or higher in play, with very similar rules.