Blizzard's latest installment in the Diablo series of fantasy role-playing games is . In the meantime, the company needs to perform stress testing of its servers, and you can help by and playing the game online. The beta has 13 levels, and you can play each of the heroic classes.

You must have a to participate, and signups are free. The stress test period lasts only until April 23 at 10:00 a.m. PDT, and Blizzard says that it's possible that you will experience performance problems--it is a , after all.

Diablo III is a highly anticipated game, so it's very possible that you'll have problems just logging into the game. But it may be worth it, especially if you've long been craving for some Diablo action.