Warren Buffett's annual March Madness bracket challenge is back, and this year he's only looking for a perfect Sweet 16. For example, the winning bracket would have to include 32 perfect selections for Round 1, as well as the 16 picks for Round 2. 

If successful, Buffett will pay the winner $1 million a year, for life. The catch is, to be eligible you have to be one of the estimated 400,000 people who work for Berkshire Hathaway.

Buffett, who is worth an estimated $83.5 billion according to Forbes, has previously offered a sum of $1 billion to anyone who could pick the perfect NCAA bracket. Worth noting, the odds of accomplishing such a feat are 1 in 9.2 quintillion. Needless to say, it has never been done.

According to Forbes, exactly zero of the 17.3 million brackets on ESPN were perfect last year, thanks in large part to the first ever 16-seed (UMBC) defeating a 1-seed (Virginia).

The first play-in games of the 2019 NCAA Tournament will kick off tonight, starting with 16-seeds Fairleigh Dickinson vs Prairie View A&M at 6:40pm ET, followed by 11-seeds Temple vs Belmont at 9:10pm ET.