Adventure calls...but you don't have four hours or the desire to set up hundreds of pieces. You want action now! One Deck Dungeon lets you jump right in, bash down doors, roll dice, and squash baddies with style. By using each of the cards in four different ways (as an encounter, XP, a skill/potion, or a stat-boosting item), all the experience of dungeon delving has been fit into a compact package.
You can venture in alone, or bring a friend. The dragon doesn't care, he's happy to eat both of you! And don't even think about trying to spare him, that's the wrong game entirely. One Deck Dungeon is a 1-2 player cooperative game. With two sets, you can play with 4 players. A game typically takes 30-45 minutes, but it could be a little shorter if you get eaten early or a little longer if you're learning or taking your time.
Check out their kickstarter page for Pnp Files and to fund this amazing game.