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@mighty-red-1
I’ve read all the comments in this topic and here are my conclusions:
Easy missions
Additional slot = 5 gems
2nd additional slot = 100 gems
Medium missions
Additional slot = 100 gems
2nd additional slot = 100 gems
Hard missions
Additional slot = 200 gems
2nd additional slot = 300 gems
The purchased slots are permanent.
Can anyone confirm this, or correct me?