The Expanse Boardgame: Doors and Corners expansion contains five new modules — Leaders, New Tech, Resource Tokens, Protomolecule, and Variable Setup — that add an engaging element to the strategy and gameplay as players compete for dominance in the world of The Expanse. You can use any number of modules in any combination in conjunction with the base game.

In more detail, leaders go with fleets and can add influence when they move with a fleet. New tech allows variety and surprise in what powers are available because when a tech is earned, you have three random choices for that tech. Resource tokens can be spent in several ways, including helping to pay CP costs, adding up to 4 AP to a card, moving up the initiative track, and earning bonus points for having the most at final scoring. Protomolecule adds a new scoring opportunity. Variable set-up allows fleets and influence to be placed anywhere at the start of the game.