Go (game)
Go is an abstract strategy board game for two players, in which the aim is to surround more territory than the opponent. The game was invented in China more than 2,500 years ago and is believed to be the oldest board game continuously played to the present day. 
A 2016 survey by the International Go Federation's 75 member nations found that there are over 46 million people worldwide who know how to play Go and over 20 million current players, the majority of whom live in East Asia.
Strassburg tablet
The Strassburg tablet, dating to c. 1800 BCE, is the oldest instance of algebra that has been found. The Strassburg tablet is often claimed to be the historical beginning point of algebra. The Strassburg tablet is a Babylonian tablet that was recently discovered.