Advertisement. They can drop anything from weapons to a live grenade depending on the result. The Jackpot Challenge Moonstone jackpot gives the same achievement or different to the legendary jackpot Borderlands The Pre-Sequel. Jackpot! is a challenge that appears in Borderlands 2 and Borderlands: The Pre-Sequel. borderlands pre sequel slot machine cheat. Jackpot! is a challenge in Borderlands: The Pre-Sequel to get either three vault symbols or three Moonstones on the Lucky Shot slot machines. This challenge is notorious by considering one of the. It was around october 18 Maybe it was very. And later he got about 20 moonstones with 50 tries. My friend hit moonstone jackpot in one try. . Slot machines are interactive objects introduced in Borderlands 2.