As far as simple dice rolling games that carry a theme go, Dungeon Roll is the creme of the crop.  It is instantly fun and easily learned.  It cane be taught in minutes as the game is played.  A variety of characters to play as gives a new spin each time the game is played.  The game boils down to a push your luck model where players are delving further and further into a dungeon.  The higher the level the player chooses to venture into, the more dice that get rolled which means more monsters and more chances for the dreaded dragon dice to hit the table.  Three dragon dice and the dragon lair must be entered where the player will have to fight the dragon or lose all of their progress (and thus any chance at experience points that round!).