The gates open wide, and three cheery adventurers step forward into Dungeonland: a stocky warrior; a thin and nimble rogue; and a big-bellied mage. Dungeonland is the titular amusement park where heroes can mindlessly slaughter hordes of ne'er-do-wells to their heart's content.

However, beyond the groups of enemies and bright facade of the park lies a devious mind that controls the waves of brutes impeding the heroes' progress. This is the dungeon master, another player who has the same job as those controlling the adventurers. Kill the other guys!