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They can be unlocked via Special Missions!!
Dere are 3 Mission Portals which can be unlocked for 3K coins, 20K coins and 50K coins.
In order to play the Special Missions you will have to wait for either 1hr, 2hrs, 4hrs, 7hrs, 12hrs and 24hrs but you can degrade the time by using pigs!!
e.g.
In a 1hr mission you can use 60 pigs(max) which will degrade your time to 30mins.
In a 2hr mission you can use 120 pigs(max) which will degrade your time to 1hr.
In a 4hr mission you can use 267 pigs(max) which will degrade your time to 2hrs.
In a 7hr mission you can use 500 pigs(max) which will degrade your time to 3hrs 30mins.
In a 12hr mission you can use 960 pigs(max) which will degrade your time to 6hrs.
I just played a special mission in which I had to pay 3000 coins to unlock it dere were 5 mystery boxes and you get 4 keys to open it and I got 5000 coins, 3 gems and materials in the other 2 boxes which help in upgrading the Transformers.