How do I activate 1999 mode in Bioshock Infinite? 275 viewsJuly 22, 2013bioshock infinite Horde39 March 28, 2013 0 Comments I read about this before release. How do I unlock it? 1 AnswerActiveVotedNewestOldest 0 Anonymous Posted March 28, 2013 0 Comments You need to be on the menu then press:Up, Up, Down, Down, Left, Right, Left, Right, Esc, Enter Login with: Register or LoginCan you help other gamers by anwering questions? Read all the latest additions.