The Expanse: Doors and Corners Expansion contains five (5) 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*! Want to only user the Leaders module? Awesome! Want to combine the New Tech, Resource Tokens, and Protomolecule modules? Even better!