The Expanse: Doors and Corners Expansion contains five new modules that add an engaging element to the strategy and game play as players compete for dominance in the world of The Expanse. On top of that, you can use any number of modules in any combination in conjunction with the base game! New Tech allows variety and surprise in what powers are available. When a tech is earned you have a three random choices for that tech. Variable Setup allows fleets and influence to be placed anywhere at the start of the game.