The Concordia Solitaria expansion allows Concordia to be played solo against the adversary, Contrarius. This expansion plays the same as in the base game, but it is played with special cards and dice. In Concordia Solitaria, you complete alone or in a team of two against the tricky opponent CONTARIUS. Contrarius reacts to what the players do on their turn. He can also become a third opponent in a 2-player. Concordia Solitaria may be played on any of the maps and with any other expansino for concordia. 40 to 90 minutes of game play. NOTE: This expansion requires Concordia or Concordia Venus to play.