Yep. I'm amazed people are discussing walking it back to town when buses are available. Walk through the underpass to Sussex Uni and jump on a 25 before it comes back past the Amex and Falmer Station and fills up.
Or walk to bottom of Coldean Lane and get the 24, or walk into Moulescomb and get the 49, or go to Falmer Village stop just before Amex and get 28/29.