Dark Queen's Mansion is the fifth stage from Battletoads (Arcade).
The last pure beat 'em up level of the game, this stage is a pretty straightforward left to right affair, where hordes of enemies come at the players from everywhere. Every now and then the player will find nuclear boxes and asphalt sticks to help fend off the opposition.
Twice in the level the players will come out to corridors in the background, from where gigantic iron balls will roll out which must be carefully dodged. At first they come one at a time but they'll soon come in pairs, forcing the player to rush to the corners or between the balls to avoid them.