Have you ever wanted to not only time travel in a game, but have time travel built into the game rules? This is exactly that chance, with no clear scenario outlines baked in (because Continuum has lots of options--not just all of time to play with, but how you're protecting it).

Of course, there are a few givens: you're basically a time cop, tasked with making sure history doesn't break; you're new to this whole time travel business and can't travel far on your own for now; and in terms of material wealth, you're fabulously rich. The Continuum is nice like that.

Warning: Continuum is a system which has lots of unique terminology, and does its level best to make a relatively-comprehensive system of time travel without explaining the physics behind it, but can get rather brain-bending in the process.