A strange little side quest
Between one round of Sand Sort: Color Puzzle and the next, this is worth knowing: The name Tetris combines a reference to four-square pieces with Pajitnov's interest in tennis. And then there is this: Street Fighter II, released in 1991, turned head-to-head arcade fighting into a worldwide phenomenon and helped define the modern fighting-game genre. That long chain of experiments is part of why puzzles still feels fresh when a game finds the right twist.