A strange little side quest
Math Calc may feel immediate, but the ideas around learning games have been evolving for a very long time. Reader Rabbit's 1986 arrival was part of a major expansion of educational computer software before the CD-ROM boom of the 1990s. The same trail leads to another fact: The name Tetris combines a reference to four-square pieces with Pajitnov's interest in tennis. It is a good reminder that simple game mechanics can carry a surprising amount of history.