Four rounds. Each round is a maximum of 30 seconds!
In each round, the player will come across enemies, which may include Possessed Worker, Imp, Hell Razer, Possessed Soldier or Possessed Security.
If the player can defeat all enemies in each round within the time limit, one of the five Hell Box demons is instantly eliminated without the player having to fight them.
When the four rounds are completed, it's time for the player to enter the Hell Box. How easy or tough this is depends on how many rounds were won. The more rounds won, the less number of demons the player has to face.
Regardless of how many rounds were won, there is one guarantee in the Hell Box. The Baron of Hell! This beast needs to be defeated in order to successfully win Hell Box.