RoomsTonite, India&rsquos first mobile-only last-minute hotel booking app, is offering a flat discount of Rs 999 on hotel booking, in addition to the already discounted hotel rates of up to 70% available on the app. Enter the promo code RT999 to avail the offer. Valid till March 31, 2015. The app is available on all major platforms and offers finest hotel choices with rates ranging from Rs. 900 to Rs. 18,000 per night. Presently, it allows a user to book a maximum of three-nights in a hotel during a last minute hotel booking.