The best selling video game of all time is:

Mario Kart

Chess

The Oregon trail

Or Tetris

Solution:

Tetris is the best-selling game video game of all time.

It is a tile-matching puzzle video game, originally designed and programmed by Russian game designer Alexey Pajitnov. The first playable version was completed on June 6, 1984, while he was working for the Dorodnitsyn Computing Centre of the Academy of Science of the Soviet Union in Moscow.