One is the false sense of accomplishment that games give you. Zelda does this very well. You have your main quests, but also a lengthy list of side quests you can tackle. It’s very goal oriented and each time you sit down to play, there is a sense of satisfaction at completing a portion of the game when you’re finished.
I want my children to understand that this is a false illusion. You have accomplished nothing beyond entertaining yourself. In a culture where entertaining oneself is a primary form of idolatry, I want to be very careful with the example I set and how we communicate about it to our children. Entertainment is serving yourself. Which is fine and good, but in a proportionate amount compared to how we spend our time overall.