Papa Sangre: binaural video game with no video

"You're in Papa Sangre's palace. His palace is in an afterlife that takes the form of a malevolent, unpredictable carnival: imagine a Mexican graveyard on the Day of the Dead -- with the lights off. You're the piñata for a host of partying monsters. They probably look a lot worse than they sound. You should count yourself lucky it's too dark to see them." Also: "Requires minimum iPhone 3GS / iPhone 4 / iPad / 4th generation iPod touch ... does not currently support original iPhone or iPhone 3G", and you need to use headphones.