Kobo has created an augmented reality game to promote eReading. The game is called The Descent and is inspired by Dante’s Inferno, Dan Brown‘s upcoming book Inferno and the works of the self-published author J.F. Penn, which are themed around Dante’s Inferno and the nine circles of hell.

The promotion encourages readers to download and read two free eBooks by Penn  – Sins of Temptation and Sins of Violence (both of which are Kobo exclusives)– in order to look for clues to crack the code of the online game.  The author’s third book in the series, Sins of Treachery, comes out in September. The first player to arrive at the final step of the gave will be awarded $5,000 and an eReader signed by Dan Brown. The promotion runs through May 14th, when Brown’s new book hits bookshelves.

Today’s Free eBook of the Day is The Da Vinci Code by Dan Brown. Doubleday is giving away digital copies of the bestseller to celebrate the 10th anniversary of the book. The eBook includes the prologue and the first chapter of Brown’s upcoming novel Inferno.

In case you need a refresher, here is more about the bestseller from the book’s description:

While in Paris, Harvard symbologist Robert Langdon is awakened by a phone call in the dead of the night. The elderly curator of the Louvre has been murdered inside the museum, his body covered in baffling symbols. As Langdon and gifted French cryptologist Sophie Neveu sort through the bizarre riddles, they are stunned to discover a trail of clues hidden in the works of Leonardo da Vinci—clues visible for all to see and yet ingeniously disguised by the painter.

Follow these links to download the free eBook: Amazon, Barnes & Noble, Google, Sony Reader, Apple iBookstore and Kobo. The download is free until March 24th.

For more free eBooks, check out our Free eBook of the Day archive.

Facebook revealed its new Graph Search tool today. It will only be available in English at the launch and is currently in beta testing mode.

The social search will let you find people who like the same things as you and search for particular themes or times among your friends. For instance, you could find out how many of your friends are excited about Dan Brown‘s new book. Check it out:

Graph Search and web search are very different. Web search is designed to take a set of keywords (for example: “hip hop”) and provide the best possible results that match those keywords. With Graph Search you combine phrases (for example: “my friends in New York who like Jay-Z”) to get that set of people, places, photos or other content that’s been shared on Facebook. We believe they have very different uses. Another big difference from web search is that every piece of content on Facebook has its own audience, and most content isn’t public. We’ve built Graph Search from the start with privacy in mind, and it respects the privacy and audience of each piece of content on Facebook. It makes finding new things much easier, but you can only see what you could already view elsewhere on Facebook.

Did you get an iPad or Kobo for Christmas and need something to read? Borders is running a sale on eBooks and has 200 popular titles for only $5 each.

Titles include Stieg Larsson’s The Girl With The Dragon Tattoo, Dan Brown’s The Da Vinci Code and Fear And Loathing In Las Vegas: A Savage Journey To The Heart Of The American Dream by Hunter S. Thompson.

To see a complete list of $5 eBooks, follow this link. The sale runs through January 2nd.