A strange little side quest
The rules may be simple on screen, but the backstory around Gallery is anything but tiny. The name Tetris combines a reference to four-square pieces with Pajitnov's interest in tennis. It also connects to a different milestone: Pong was field-tested in California bars in 1972 and helped launch the modern arcade-game era. It is a good reminder that simple game mechanics can carry a surprising amount of history.