This was posted 4 years 9 months 15 days ago, and might be an out-dated deal.

expired Steam Weekend Deal - Modern Warfare 3 - $0 (Free Weekend)

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Play the game for free until Sunday, 1 PM PST. You will need a Steam account, which will be of good use if you haven't got one.

Should expire around 8 AM EDT on Monday morning.

Edit.
According to members, it's multiplayer only.

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