A time jump has gone bad. Now there are two copies of you: You, and your evil twin from a parallel dimension! Eliminate your evil twin before he or she eliminates you. In Duplexity, you travel through time and space and manipulate the timestream to erase all trace of your opponent. Sacrificing time-clones of yourself, although not desirable, may be necessary.
The board has eight physical locations. Each physical location has five temporal locations: the far future, near future, present, recent past, and distant past. There are two more temporal locations: the unknown future and the permanent past. Each turn is divided into phases. Early in the turn, the players get to move and alter the state of the board. Later in the turn, time moves from the future toward the past. This means that anything in a:
- distant past version of a physical location moves into the permanent past and off the board
- recent past version of a physical location moves into the distant past version of the same location
- present version of a physical location ***copies itself*** into the recent past version of the same location
- near future version of a physical location moves into the present version of the same location
- far future version of a physical location moves into the near future version of the same location
The layout of the board, combined with the mechanics for the progression of time are the critical elements for representing time travel in the game.