What: Footsteps of the Raj – Mumbai Heritage Tour by AudioCompass.in, download the iOS app here, USD 1.99.

Why: The guys behind the Taj Mahal Official Tour app have designed their first one for Bombay - Footsteps of the Raj – Mumbai Heritage Tour. It features forty short narratives about historic sites like Horniman Circle, Asiatic Library, Kala Ghoda and the Gateway of India, related by two fictional characters: a city native and an Englishman from the British Raj. Walk around, and play and pause at will. The app also comes with marked maps and photographs.

When: You want to play guide and seek.