According to this renowned official page, you can add Call of Duty 4 boxed copies to your Steam account.

However, that seems like it's still broken. I've tried both original format and divide-into-five-characters format; Steam says that key is invalid. Anyway, feel free to try if you have a boxed copy.

10 years ago*

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Not working for me either...

10 years ago
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Still invalid :(

10 years ago
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Does this happen often? Where they start accepting retail keys for games they never did before? This is a first for me.

10 years ago
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Isn't CoD4 retail key a 20 digits long?
According to link You have provided it is possible to activate retail CoD4 key but it has to be 15 digits long.

I truely doubt that 20 digits long CoD4 keys can be activated on steam.

10 years ago
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Most probably. Mine is 20 digits long as well. If they added this in list just for sites which provides Steam keys for Call of Duty 4, i don't know. They don't add most of retail games on that list but, in the end, it's a well-known franchise, so maybe...

10 years ago
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my Cod4 has 25 letters/numbers

10 years ago
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Closed 10 years ago by bfrheostat.