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