"CONCORDIA SOLITARIA is a solo and 2-player expansion for Concordia. In CONCORDIA SOLITARIA, you compete alone or in a team of two against the tricky opponent CONTRARIUS. As the cards you play also determine the reactions of your adversary, only skillful planning leads to victory. In a two-player game, you may compete against CONTRARIUS as a cooperative team or challenge it individually. CONCORDIA SOLITARIA may be played on any of the maps and with any other expansion for CONCORDIA. Requires either the base game CONCORDIA or CONCORDIA VENUS to play."