To play the game, you must manipulate the timeline to change key events. Every change you make may cause one or more paradoxes to appear on the timeline.
This is the timeline at the start of the game, which reflects history as we know it. It starts at 1865 with the assassination of Abraham Lincoln, and ends in 1999 with the shootings at Columbine.
The purple cards are called Linchpins. These are the cards that contain events which you can directly change. The blue cards are called Ripple Points. Every time a Linchpin is changed, one or more Ripple Points become a paradox.
Lets illustrate that a bit.
