A strange little side quest
The mechanics around IQ Battle Quiz have roots that stretch far beyond modern browsers. The name Tetris combines a reference to four-square pieces with Pajitnov's interest in tennis. That old idea kept changing rather than disappearing. Midway's Gun Fight from 1975 was the first arcade video game to use a microprocessor. The details change, but the appeal of learning a system and trying again is remarkably persistent.