Saboteur

A group of dwarf digging dwarves chop their way through the hard rock of a massive mountain. There are real prospectors, but also saboteurs, who want to hinder them.
Both groups try to reach their odel by helping each other, even though they can only guess who their buddies are. When the prospectors find the treasure, they are richly rewarded and the saboteurs receive nothing. But if the treasure is not found, the saboteurs win and the treasure diggers get nothing!
The players only announce their roles at the end of a round. Whoever has the most gold pieces after three rounds wins the game.