If you have a copy of SimCity 4 lying around, Rush Hour is the perfect reason to dust it off. It's easy enough to rework old cities with the new traffic tools and aircraft-equipped deluxe fire, police, and medical buildings, plus you can get a new ground-level perspective. The earlier patches can significantly improve performance on modest PCs, so it may also be possible to turn up the visual detail and see the game's impressively lush cityscapes. Since the release of the lot editor, the SimCity.com Web site has grown full of user-made lots to exchange, which can add a ton more variety. This makes up for the fact that there aren't all that many new buildings in the expansion, although there is one more visual style (raising the total to four). Considering that Rush Hour can be had for a mere $10 after EA's introductory mail-in rebate, there's little reason to miss out on playing SimCity at its very addictive best.