A strange little side quest
Zoom out from Hidden Birds Html5 for a moment and the timeline gets surprisingly deep. The name Tetris combines a reference to four-square pieces with Pajitnov's interest in tennis. That old idea kept changing rather than disappearing. Nintendo's Donkey Kong arrived in 1981 and introduced the character first known as Jumpman, who later became Mario. So a round of Hidden Birds Html5 is not just a quick distraction; it is a tiny stop on a much longer puzzles timeline.