Advent

Colossal Cave Adventure (also known as ADVENT, Colossal Cave, or Adventure) (Crowther, 1976; Crowther & Woods, 1977), an iPhone version of the first text adventure computer game.

Rewrote game to implement 1000-point version by David Malmberg.  Also, added Game Center support!  In addition to leader boards, you can now invite other players and give them a virtual tour to help them should they get stuck.