MLB 2K13's fourth annual Perfect Game Challenge officially kicks off at today at 9 AM PT, and runs through April 30. The rules are a little different this year. One player won't be walking away with a million dollars. Here's what 2K Sports has planned:

"Contestants can compete to win up to 30 $25,000 prize pools ($750,000 total), one per MLB team. Not only that, the four contestants with the top-rated perfect games thrown with any team will move on to the Perfect Game Challenge Tournament during MLB All-Star Week in New York for the $250,000 grand prize. For the second year in a row, 2K Sports’ proprietary algorithm will rank individual perfect games based on difficulty (such as the opposing team’s offensive prowess and selected pitcher’s skill) and degree of perfection (such as number of strikeouts and pitching efficiency)."

I detailed 15 reasons why this year's game may make the Perfect Game Challenge a little bit more difficult than last year. To those who are stepping up the challenge, good luck! If you have any good stories that pop up during the challenge, please send them our way.