And later he got about 20 moonstones with 50 tries. They can drop anything from weapons to a live grenade depending on the result. Jackpot! is a challenge that appears in Borderlands 2 and Borderlands: The Pre-Sequel. It was around october 18 Maybe it was very. The Jackpot Challenge Moonstone jackpot gives the same achievement or different to the legendary jackpot Borderlands The Pre-Sequel. Advertisement. . Slot machines are interactive objects introduced in Borderlands 2. My friend hit moonstone jackpot in one try. 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.