<human>:  How many levels of the game ‘Dungeons & Dragons’ are there?
<bot>: There are three main levels: First, Second, and Third. Each level has several sub-levels, such as First-level dungeon, First-level wilderness, and First-level city. The number of levels is usually determined by the player, but there are some general guidelines. The first level is usually the size of a small town, the second level is usually a large city, and the third level is usually a small country.