Dunkin' Donuts is offering a free medium, hot coffee Tuesday only at two Tempe locations to 6,500 ASU students. No purchase is necessary. This offer is valid until 2 p.m. Tuesday at the Mill Avenue and Fifth Street location and until 6 p.m. at the University and Priest drive location. The students received a text message for the offer, and have to show the message to redeem it. To receive daily deals like this text ASU to 74455.