Premium titles shift to free-to-play for different reasons. For the two games that go freebie this week: Sharknado: The Video Game is in celebration of the Shark Week and SXPD: Extreme Pursuit Force simply changes its monetization model permanently.
Sharknado: The Video Game is the official game inspired by the SyFy series. It is an endless runner where you play as Fin on the epic mission of stop the tornado and sharks in it from destroying Manhattan single-handedly with a chainsaw. It goes free only temporarily in honor of Shark Week. Grab it before it returns to the usual price.[App Store]
SXPD: Extreme Pursuit Force is a combination of digital comics and racing elements. Initially a paid game, SXPD has changed its monetization model to free-to-play. With this change, SXPD offers the first chapter of the game for free but requires in-app purchase to unlock and get the rest of five episodes at the price of $0.99. Alongside, this game also goes universal, so that it is available on iPad and iPhone, too. [App Store]