This is an event that came in the middle of Easter Egg Hunt 4. Its duration was 3 days, longer than both of the previous April Fools' Day Events. The Rookie machine gun gained its usual status as the most powerful weapon in the game and a new skin that makes it look like a crudely made Aristocrat's Shotgun with cardboard taped onto it.
The 2nd and 3rd tiers actually don't require anything as they fill while the player is alive. They are also a reference to the many complaints they get about the triple and multi kills tiers in events.
Fluffy made it's return although you will not progress for killing it or inflicting damage on it