A strange little side quest
There is a neat bit of history hiding behind the kind of play you find in Zombie Plague. Space Invaders arrived in 1978 and helped turn electronic games from an arcade curiosity into mainstream entertainment. The same trail leads to another fact: Games resembling checkers were being played thousands of years ago; evidence of related games reaches back to around 1600 BC. The details change, but the appeal of learning a system and trying again is remarkably persistent.