When I play multiplayer on halo CE the moment I select a map it says you're cd key is invalid........help me
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Most likely someone on the server you're trying to join used the same CD key as yours. (That means at least ONE of you is using a product key found online.)
I have the answer, first you must to delete the halo CE and then Installed it again with other CD key and you must be Can Play Multiplayer
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