Attacking a Mega Crab stage does not cost gold. Instead, there’s a set amount of attacks you may use to defeat him. Each time you attack, your remaining attacks will be reduced by one.
When the Mega Crab appears in game, every player starts with 3 out of max 8 attacks.
Each player gains one new attack per 2,5 hours. This regeneration starts as soon as the event does, if you are online at that point or not.
Due to this, it is possible that:
Example – Player A goes online as soon as the Mega Crab appears, has 3/8 attacks but player B who goes online 2,5 hours after the Mega Crab appears has 4/8 attacks.
This is to ensure that everybody has the same chances.
You’re not required to to be online exactly when the event starts in order to compete in the leaderboards.
Attacks on Mega Crab stages leave persistent damage.
Fact Check:
Starting attack pool: 3
Maximum attack storage: 8
Attack regeneration: 1 per 2,5 hours
Clearing a stage gives one free attack