The Egghead trait doesn’t work with all mental skills, at least video gaming, not sure what else tho. Unless I’m doing it wrong, I thought I have to engage in any mental skill building when I get the moodlet about an idea.
Video games were deliberately excluded, despite being classed as a mental skill by the game, as they don't fit the theme of productivity. Your Sim will have more luck working on Handiness, Rocket Science, Research, Archeology, or even their homework.
