A. You're not being patient enough in waiting for the server to connect

B. There's apparently a limit of 100 people for the back-up server...and there are about that many people in. This might be why. Keep trying, though, don't give up that easily!!!

C. You don't have version 3.21 downloaded. To download it, click on Game Info at the top of the page and find the place to download it.

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Just thought I'd help clear up any confusion, these might be reasons why you're not getting in.