I have been playing a lot of [url=http://www.bay12games.com/dwarves/]Dwarf Fortress[/url] on my Aspire One... For an ascii based game it requires a pretty strong processor. I actually tweak the settings for better fps and reduce the playing area. Use the [url=http://pkf.olivepeak.com/dwarfcalc.html]Dwarf Fortress window calculator[/url] to adjust for screen size (by editing the init file. Personally I prefer to play with a tileset found in the [url=http://www.bay12forums.com/smf/index.php?board=13.0]mods section of the forums[/url]. I have been using Ironhands which is a great set. If you want a deep game that has an amazing amount of complexity to it this one is for you.