Not on topic but I'd want to mention the stock market as a good game for adults. I played computer games in my teens and twenties but now, in my thirties I find them quite boring, predictable and repetitive.
For three years now I picked up a new hobby: stock market. I watch CNBC, I read business newspapers, i follow a ton of finance blogs, I think, I make hard decisions, I put my money at risk, I master my impulses and emotions. I throughly enjoy it.