You'll build your dungeon, a room at a time, from 24 heavy, double-sided tiles. Each shows a different room . . . some are good for certain characters, some are bad. Populate it with monster standies and let your munchkins run amok!
Cooperate with the whole group, adventure with a partner, or strike out on your own. You don't know what's behind a door until you open it . . . then another room is added to the dungeon. Battle monsters for power and treasure, or send them after your friends. Reach Level 10, and then get out alive if you can . . .