A strange little side quest
A little context makes Spring Differences Html5 more fun to place on the gaming map. The name Tetris combines a reference to four-square pieces with Pajitnov's interest in tennis. That old idea kept changing rather than disappearing. In 1958, Tennis for Two used an analog computer and an oscilloscope to turn simple physics into a playable tennis-like demonstration. That is the kind of background detail that makes another attempt at Spring Differences Html5 feel a bit more connected to the history of play.
