questionswhat is the best game sold on steam and why?

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Both Portal games. Hands down.
Great story, graphics, gameplay, controls. Valve is amazing at what they do. Just hate that it takes them forever to release things.

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Team Fortress 2. Cartoony graphics and funny people and community maps are all plusses.

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Psychonauts. Not your standard game by any means. Refreshing.

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Fallout New Vegas. Reason? Hardcore mode.

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Super Meat Boy-super challenging with a retro feel. And bit.trip runner-great music, equally challenging.

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Mount and Blade Warband. It's not as polished as most other games and it's hard to put it in a specific category, but it will rock your world and make time disappear.

Try the demo. I think there's a level cap but I was able to play it for about 3.5 hours before I realized how late it was getting. Then bought it and played another 8 hours.