If you think Tetris is a movie about the invention of the pioneering and hugely addictive video game, you’re completely right: director Jon S. Baird’s jaunty, entertaining picture traces the roots of the game to its beginnings in Soviet Moscow in 1984, the brainchild of computer programmer Alexey Pajitnov—played in the film by Nikita Efremov—who would invent little games as a way of testing the capabilities of new equipment at work.