Play Multiplayer Online games if you're too good for Single Player games.
I had the same problem, bought a game and beat it in 8 hours or so.
If you have a PC and not alot of money, download Wolfenstein: Enemy Territory. It's free, and it's arguably the best Multiplayer game of all time. America's Army is free too.
You'll be suprised at how poor you are at video games once you hop in a server full of good players, th3y will PWN j00!!!
Other good multiplayer games are Day Of Defeat and Counterstrike, also a new game called Savage which is an RTS and and FPS in one.
On the console side of things, get xbox live and try Unreal Championship or Wolfenstein.
Playing against real people instead of stupid AI will make things alot more interesting for you.
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-God
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