The "treason" game mechanic is rare in videogames. There are few thing that more delicious than the thrill of betraying someone at the perfect moment. It is akin to seeing the perfect cherry blossom or a prancing unicorn -- a truly magical moment. Treason game mechanics are found in some tabletop games but most of them are lengthy or have player elimination.
This is where Saboteur 2 shines. Saboteur 2 has three intense 20 minute rounds with no player elimination. Three rounds means that lots of players get to play traitors. Saboteur 2 is an expansion to Saboteur, thus you need Saboteur to play Saboteur 2. Saboteur 2 fixes the game balance issues of the Saboteur(s) losing more often.