@Carl, did you mention in the Video Gaming guide that, if you have two or more gaming mats in your house, your sims can "play together."
After one sim starts playing a game on one mat, have the other sim click on an unused gaming mat, and he or she will get the option to, "Play Motion Game Together." They are each on a different gaming mat and can be in different rooms, but it increases their social as well as fun.
Also, my focused sim, with all green moodlets, clicked on the gaming mat and had the option to either "Force Self to Play Game" or "Enter Game Tournament." That one was hard to reproduce, but I took a picture of it with my cell phone and will post it once I get it online.