I just bought Crysis 2 via download @ eastore.ea.com, and I only received the serial key for the game. But the game asks for a multiplayer key for playing online, where can I get a key for that?

Its the same key for SP and MP.

Ensure that you're using all capital letters and adding in the hyphens "-" between each character sets, exactly as it's printed.

Thanks, it was indeed the same code, just had to add the dashes!

On a side note, why on earth the game asks for the *SAME* key twice?