THQ has announced a special treat for Playstation 3 gamers, with a free digital copy of Saints Row 2 being made available when you redeem your Saints Row: The Third online pass within the next 90 days.

These kinds of promotions are becoming increasingly common as game publishers look for ways to maximize the revenue on their new games by bundling titles from their older libraries.

Speaking on the Playstation Blog, Jon Miller, spokesman at THQ said “At long last, THQ and our friends at PlayStation are proud to unveil additional content for Saints Row: The Third owners on PS3. For all players that purchase Saints Row: The Third on Playstation 3 and redeem their online pass codes within the next 90 days, they will receive a digital copy of Saints Row 2 (a $19.99 value)… absolutely free!”

In the ongoing fight against the pre-owned games market, many publishers are now making online game modes available only by purchasing a brand new game, or buying an online pass from the Playstation Network and XBox Live stores. Saints Row The Third is no exception, with the co-operative functionality of the game relying on an online pass to enable it. This offer from THQ sweetens the deal somewhat though, particularly coming weeks after Electronic Arts withdrew its offer to include the downloadable title Battlefield 1943 with the PS3 version of Battlefield 3.

This offer will be available until midnight on February 13, 2012, but is only valid for customers in the United States, Canada and Mexico. There is no word from THQ as to whether this bonus content will be made available in any other regions.