It’s early afternoon on Friday, Jan. 16. On the third floor of MIT’s Building 34, three classrooms are buzzing with excitement. This is the assigned home base for Team PuzzFeed, whose members are clustered at round tables, refreshing their laptop screens impatiently. They’re waiting for 1:17 p.m. — the slated start time for the 2015 MIT Mystery Hunt. “It’s up!” someone shouts, and the team cheers as the first puzzles load online. Sarah Schwartz ’15 reports.