what the best computer game

it really depend on what you like. I have two games: DOTA (Defense of the Ancients) that is a strategy game and Tom Clancy's Ghost Recon that is a war game.

It's depend on your computer specifications and your nephew genre like. If your nephew like and FPS (First Person Shooter) then he will loved to play Rainbow Six Vegas, Farcry or Gears of War, but if your nephew like RPG (Role Playing Games) he will like Final Fantasy, Elder Scroll and much more. You should ask him what kind of genre he/she like.

Me personally, i love Real Time Strategy computer games (RPG), specially Rise Of Nations and Stronghold. Both of those game are really cool and your nephew will get extra history education about kingdoms in past time. The games are challenging us on how to build a kingdom and create a strategy to qonquering the world.