Man, the slots seemed much nicer in BL2, especially with Eridium jackpots. . 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. And later he got about 20 moonstones with 50 tries. I know it's probably the same RNG, but ever since I've started. After about tries, it crossed my mind that it may not even been possible to win. Slot machines are interactive objects introduced in Borderlands 2. 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 borderlands: el logo del videojuego de la pre-secuela, reloj. I'm sure it's just RNG being RNG, but I figured I'd ask. It was around october 18 Maybe it was very. My friend hit moonstone jackpot in one try. borderlands 2 slot machine trick. Advertisement. They can drop anything from weapons to a live grenade depending on the result.