MysteryBox Event
Start every day 02:00 PM & 09:00 PM by server time

first you need to collect 100 MysteryKey

Then You have 4 portal its open one by one

then go to the Portal and give the box that 100 Key then wait 5 Minute

then when you open that all 4 box you will invite the SuperMysteryBox
in the last portal in the middle of the map that open after 15 minutes and giving diamondBox

diamond box can give you any of this rewards