How do I activate 1999 mode in Bioshock Infinite? By Horde 0 1.84K viewsJuly 22, 2013bioshock infinite Horde57 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 You must be logged in to answer questions or comment Register or LoginCan you help other gamers by anwering questions? Read all the latest additions.