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But how will you get there? And how will you return?  Also included are a half-dozen key NPCs, twenty-odd time travel devices, basic procedures for dealing with paradoxes and time travel, a few time-based monsters, and some world-shattering ways of ending the adventure. Survive strange chronologic horrors, solve paradoxical mysteries, and save the station from its own recursive fate—and do it all without accidentally fragging yourself out of both space and time. As you move present to past to future, the station changes, and so each of the rooms has three separate keys.