Engines & Empires Core Rules

From the introduction:

Engines & Empires is an old-school steampunk and fantasy role-playing game. There’s quite a lot there to unpack, but since it’s fashionable these days to begin a new role-playing campaign with a “buy-in” session to make sure that the referee and all the players are on the same page, perhaps role-playing games themselves should also be more upfront about their basic assumptions.