On Mars
How many players does each chapter support, and which can be played solo?
Chapter 1, The Invasion, is one against all for 3 to 5 players, or 2 using two boards in an open formation. Chapters 2 (Outbreak) and 3 (Power Shortage) are co-op for 2 to 4 players and can be played solo by running two hands. Chapter 4 (Monolith) is solo. There is no semi-cooperative mode.