The reward of Mysterious Stones is stone. Each opening has 2 entries: one for free and one for using 3 Crystals.
The system will randomly select 1 of 3 ships, Hurricane Hawk, Phantom Assassin, or King Pirate to start the battle. In addition, you can choose 2 types of Boosters, Power and Super, to support yourself.
This mode has 3 levels: Medium, Hard and Crazy. You need to pass the previous level before you can play the next level.
Mysterious Stones will be open every Wednesday, Thursday, and Friday.