The "Mole Man Expeditions" monthly side quest is the best monthly side quest thus far.
Whoever in the Kabam team thought of this month's monthly side quest should either get a raise, promoted or both.
The difficulty is scaled to consider enough difficulty without being overly difficult, the rewards are proportionate to the time spent and energy used. The timing and duration for completion and exploration stretch long enough to justify the wait for the next stage's opening. Everything about this month's side quest justifies even not having an extra store to buy additional stuff.
This is how monthly side event quests should be. This is an excellent template for future monthly side quests.
Kudos and great job, Kabam.