Whether you're a die-hard hoops head, a casual or someone who's never watched a college basketball game, there's a decent chance you've been invited to fill out a bracket. Here's what you need to know.

Their proven projection model has simulated every game in the tournament 10,000 times. It has absolutely crushed its March Madness picks recently, beating over 91 percent of all CBS Sports brackets in four of the past six tournaments.