Tropico 4. I couldn't help myself and picked it up in the Steam holiday sale, because it was under $10. It's not a bad game concept-wise, but it has some pretty serious balance issues. It looks like the designers wanted the game to last a long time, but couldn't figure out a way to do that without just making each individual mission take longer than the previous mission, so whereas the first few missions were taking a couple hours at a time, the most recent missions have been taking me 6 to 8 hours (each) to complete. It's still fun, but if mission 12 takes 8 hours, I'd hate to see how long mission 20 (of 20) takes.