There are parts of this level that aren't required to complete in order to reach the exit elevator.
This level have most of its treasure boxes behind Energy Doors. You need to pay energy to enter these areas. The level can be completed without the need to pay.
Gallery
Map of Meteor Mile II.
One of the energy doors in this level.
The entrance to the danger room.
The area inside the danger room.
The rewards after defeating all the monsters of the danger room.
One of the Mecha Turret you can pay for inside the danger room.
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