The Beginning of Video games
This is the Nimatron. Introduced at the 1940 worlds fair in New York. Players had to avoid picking the last match. The computer won 90% of the time, since it knew which matches to pick.
This is the Cathode Ray Tube Amusement Device! I know, it's a mouth full. Using a cathode ray tube, players shot targets on a radar using electric symbols. This was created around World War 2 and is considered to first shooting game. That's right. Gears of War, Call of Duty, Halo, Battlefield; this is their great great great great etc. great grandfather. They have this to thank that they exist.