There’s no single antonym for “video game” because the term bundles interactivity, simulation, leisure, and digital mediation. Flip any one of those axes, and you get a different “opposite.”
Asking for the “opposite” reveals what you value in games. If you prize agency, the opposite is passivity. If you prize escapism, the opposite is gritty reality. If you prize systems mastery, the opposite is chaotic improvisation.
Video games are a medium, not a monolith. Their “opposite” shifts with the lens—making the question more useful as a mirror than a dictionary lookup.