If you're playing Diablo III, you're definitely not alone. According to Activision Blizzard, the action-RPG has broken day-one PC sales records, selling more than 3.5 million copies of the game in 24 hours. And that's just the beginning.

When you include players who got the game as part of the World of Warcraft annual pass, that number jumps to 4.7 million players worldwide on the game's first day. Diablo III has sold more than 6.3 million copies in its first week.

"Regarding today's announcement, we recognize that setting a new launch record is a big achievement," said Mike Morhaime, Blizzard founder and CEO. "However, we're especially proud of the gameplay feedback we've received from players worldwide. We're pleased that Diablo III has lived up to players' high expectations, and we're looking forward to welcoming more players into Sanctuary in the days ahead."