UPDATE: The game's developer doublesix has been in touch to point out that Who Wants to be a Millionaire: Special Editions is not currently available on PlayStation Network.
It was "mistakenly" released to Sony's store last month before quickly being pulled. A proper release is due later this year on both PSN and XBLA, with a firm date due soon and pricing TBA.
ORIGINAL STORY: Random crossover alert. Digital quiz show tie-in Who Wants to be a Millionaire: Special Editions gets a South Park DLC pack later this year, publisher Deep Silver has announced.
The add-on will include hundreds of questions based on the caustic cartoon series, five player avatars designed by the South Park team and Phone-A-Friend help courtesy of key characters from the show. There's four-way multiplayer and online leaderboards too.
Who Wants To Be A Millionaire: Special Editions is currently available on PlayStation Network, with an Xbox Live Arcade launch planned for later in the year to co-incide with the arrival of the South Park DLC.
Deep Silver hasn't confirmed a price for the South Park pack as of yet.