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