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The game has been described by the developer as a "video game with no video" — its environment is rendered exclusively in sound via binaural audio, processed on-the-fly using The Papa Engine, a proprietary audio engine.
The game was released originally in December 2010, with a fully re-written version released in April 2013 based on an entirely new engine. The sequel, Papa Sangre II, was released on Halloween 2013.
The developer had intended to use VoiceOver, an accessibility function on Apple’s iPhone, to help with user interface for those who need to play the game using that function. VoiceOver wasn't flexible enough to work at the same time as the sound engine, so after discussion with user testers the developer had to create a separate user interface for VoiceOver users, which encouraged them to turn VoiceOver on and off. The development team includes Paul Bennun, Ben Cave, Adam Hoyle of Do Tank Studios, Peter Law, Margaret Robertson, Nick Ryan and Tassos Stevens of Coney with llustration by Sofiski. The team had also created its own 3d audio engine. Papa Sangre was inspired by Sangre Y Patatas. Somethin’ Else thought of pricing the game at £1.99, but Apple encouraged the team to raise the price. At launch, Papa Sangre was priced at £3.99.
Papa Sangre is a thriller/horror game based only on binaural audio. Headphones are required to play. The player moves using foot buttons displayed on screen for each individual step and turns using a built in accelerometer or swiping across the wheel on the top-half of the screen. If the player taps each button too fast, the character will fall. While traveling through the world, various sound effects are heard to guide the player. Using binaural audio, the player can determine which direction or how far or close objects are. There are a total of 25 levels to complete as the player tries to survive. The player must collect musical notes and reach the exit to proceed.
Reviews for Papa Sangre are mixed with both negative and positive response. Many negative responses were from pricing and file size. Papa Sangre received an award for ‘Most Innovative Game’ at Mobile Gaming Awards in March, 2011. A sequel for Papa Sangre is currently being developed as of April 14, 2011, along with The Nightjar, another iOS device game featuring the same binaural audio concept.