The curriculum is usually modeled as some form of reward function to steer learning, or sometimes by environment configuration (e.g. learn to walk on a normal surface before a slippery surface).
From there, difficulty should scale up so you don’t always win, giving you that “intermittent reinforcement“ that makes games addictive
The other reasons would be overcoming other humans (esports/pvp multiplayer), discovery (story driven and exploratory games), and just passing the time (casual games).
With DeepSeek R1 and these autonomous driving research results, it feels like we've entered an era where human data is no longer necessary. The ability to infinitely expand learning through simulation while maintaining safety in the real world feels like science fiction coming to life—it's truly exciting.