Quite a lot. At least those games that none of my friends were/are particularly keen on. But to mention a couple: Civilization games, and from the most recent:
SpaceChem. That game is a masterpiece. If you like puzzle games and giving a proper scratch for your brain, check it out. 10 ? is a steal for the value, but more remarkably: the demo is very long, and offers a lot, maybe 3-8 hours worth of challenges.
SpaceChem. That game is a masterpiece. If you like puzzle games and giving a proper scratch for your brain, check it out. 10 ? is a steal for the value, but more remarkably: the demo is very long, and offers a lot, maybe 3-8 hours worth of challenges.