In poker, there’s a simple adage—your opponent’s either bluffing or he’s not.

Poker aficionados who think they know how to read their opponents’ faces and body language will now have the chance to put their ability to the test. PokerStars has launched its Truth or Bluff challenge, which offers up to $30,000 for those that think they have the right stuff.

In order to compete, players have to watch a video posted on Twitter and determine if Dutch poker pro Fatima Moreira de Melo is being honest in a face-off against her tough opponent, Daniel “Kid Poker” Negreanu. If she is, the player would send a Twitter response of ‘truth;’ otherwise, tweeting a quick ‘bluff’ is all that’s necessary. The tweet should be accompanied with the hashtag #PlatinumPass and the user’s screen name.

There are no limits on how many times players can make a run at the game, and participation is free. The first video is already up and can be found here. There will be new challenges posted by PokerStars on Twitter every week, and answers must be submitted before the Thursday of that week. A test video is available on PokerStars’ Facebook page, and pits Negreanu against Liv Boeree.