A strange little side quest
The rules may be simple on screen, but the backstory around Backgammon Webgl is anything but tiny. Games resembling checkers were being played thousands of years ago; evidence of related games reaches back to around 1600 BC. It also connects to a different milestone: The name Tetris combines a reference to four-square pieces with Pajitnov's interest in tennis. That history is one reason familiar mechanics can still feel new when they are recombined well.