Even a cheaply constructed game is a must buy (e. g. Supremacy: Four Paths to Power by matrixgames) if it has a hotseat multiplayer option. Hotseat is easy to implement with turn based strategy. MOO2 is a good example. I would ask that if a multiplayer expansion is developed for GalCiv II, please consider adding a hotseat multiplayer option. If an excelent game comes along with a hotseat option - how can a game be more then a must buy?