Does anyone know if Jackpot! challenge in Concordia is broken in any way? I'm starting a new character and I cannot get this challenge even though I got. It was around october 18 Maybe it was very. After about tries, it crossed my mind that it may not even been possible to win. Jackpot! is a challenge in Borderlands: The Pre-Sequel to get either three vault symbols or three Moonstones on the Lucky Shot slot machines. borderlands 2 slot machine trick. I'm sure it's just RNG being RNG, but I figured I'd ask. borderlands 2 borderlands: el logo del videojuego de la pre-secuela, reloj. Slot machines are interactive objects introduced in Borderlands 2. And later he got about 20 moonstones with 50 tries. Advertisement. They can drop anything from weapons to a live grenade depending on the result. Man, the slots seemed much nicer in BL2, especially with Eridium jackpots. I know it's probably the same RNG, but ever since I've started. . My friend hit moonstone jackpot in one try.