Mancala
Mancala is one of the oldest known games to still be widely played today. "Mancala" is a generic name for a family of two-player turn-based strategy board games played with small stones, beans, or seeds and rows of holes or pits in the earth, a board or other playing surface. The objective is usually to capture all or some set of the opponent's pieces. Versions of the game date back to the 7th century, and evidence suggests the game existed in ancient Egypt.
Netrek
Developed as a successor to 1986's "Xtrek", "Netrek" was first played in 1988. It was the third Internet game, the first Internet team game, and as of 2011 is the oldest Internet game still actively played. It pioneered many technologies used in later games and has been cited as prior art in patent disputes. "Xtrek" and "Netrek" are the oldest games of what is now called the MOBA genre.