Jenga is a game of physical and mental skill created by Leslie Scott, and currently marketed by Parker Brothers, a division of Hasbro. (wikipedia)
Wikipedia: Jenga is a game of physical skill created by Leslie Scott, and currently marketed by Hasbro. Players take turns removing one block at a time from a tower constructed of 54 blocks. Each block removed is then placed on top of the tower, creating a progressively taller and more unstable structure.
Rock balancing - Rock balancing or stone balancing is an art, discipline, or hobby in which rocks are naturally balanced on top of one another in various positions without the use of adhesives, wires, supports, rings or any other contraptions which would help maintain the construction's balance.