The Saboteur 2 expansion adds new role cards (the boss, profiteers, geologists) to the base game, new action cards (steal gold, change your role), and new tunnel cards featuring doors, ladders and bridges. What's more, the gold seekers can now be divided into teams — blue vs. green — and only those on the team that finds the gold score anything — assuming that anyone finds the gold at all, of course...
 
This expansion requires the original Saboteur in order to play.