Impel Down is also called the Great Underwater Prison, the biggest one in the One Piece, which is located at the bottom of the sea. It is guarded firmly because a number of famous pirates are held there, and is also an important governing organization in the world.
The Impel Down is divided into 6 levels, and each is guarded by 30 guardians.
After defeating the current guardian, players then can fight the following one.
Players can enter to the next level only if all the guardians are defeated, and players cannot skip the current round or skip the current guardian to challenge.
Players can get a great deal of Beli, Random Gem Chest and Ship Parts after defeating a guardian.
Ship Parts are further classified into green quality, blue quality and purple quality. As player defeat more guardians, higher quality parts will be dropped. .
Players own 3 hearts before they challenge the Impel Down. If failed, 1 heart will be deducted. Players cannot continue to challenge once the number of the heart is 0. Players can reset for free once per day.
After resetting, players will start back at the first level and own 3 hearts again.
Players can also get extra reset chances with by spending Coupons or Diamonds.