Sid Meier's Civilization Revolution, Nintendo DS: The game's introduction usability could use some work, since it's very hard to learn even the basics of this game by guessing. The complexity lends to very interesting and varied strategies, with the game scaled down to the DS -- only a few hours to get, for example, amusing types of victories like having Montezuma's Aztecs arrive at Alpha Centauri in 2084. The UI is simple but not intuitive -- it's easy to accidentally do lots of things, and the touch screen support is very poor -- it's much easier to use the D-Pad than to try to use the touch screen which can cause many accidental commands due to the density of the information on the small screen. If you like strategy, it's an amusing game rental for a week or two.