Is a challenge to get either three triple Eridium bars or three Vault symbols on the Lucky Shot slot machines. The Lucky Shot slot machines are located in Moxxi's bar in Sanctuary. Completing this challenge is purely down to random chance and will likely take many spins of the slots. The cost per spin depends on story-line progression. Importantly, only the triple Eridium bars symbol.

Slot machines are found in Moxxi's Den in Sanctuary, The Holy Spirits just outside Outlook, and in an abandoned house with two vendors outside in The Dust. By using them, cash will be taken from you and the three reels will spin. This cost scales upwards as the player progresses the main quest. Depending on what they stop on, you may be rewarded.

Slot cost is determined by the formula: 1.12^L * 48, where L is the items level, you may be rolling for items below or above your actual character level.

Lining up 3 of a kind gives you special rewards:

• 7 — gives you a customization item.
  
• Bandit Head — drops a grenade that deals massive damage in a large area, so get out of there fast! The machine will play a sound clip of someone saying 'Boom time!' and the grenade will beep much like a Suicide Psycho's grenade does.
  

• Single Eridium Bar — will give you 4 Eridium.
  
• Stack of 2 Eridium Bars — will give you 8 Eridium.
  
• Stack of 3 Eridium Bars — will give you 12 Eridium and complete the 'Jackpot!' challenge.
  
• Borderlands Logo — will give you an orange weapon of your level and complete the 'Jackpot!' challenge.
  
• Markus Head — will give you a purple weapon of your level.
  
• Leg — will give you a blue weapon of your level.
  
• Cherry — will give you a green weapon of your level.
  
• Bell — will give you a large amount of cash.
  

Other combinations containing the same symbol in the first two positions will give either a white weapon of your level (if the third symbol is a bandit head) or cash (if the third symbol is a bell or the first two are bells and the third anything other than a bandit head).

If there are no matches at all, or if symbols other than the first two match (i.e. A-B-A or B-A-A) a three note sound will play and no reward will be received.

The slot machine is a new addition to Borderlands 2, and it allows you to spend all of your hard earned cash for the chance to win fantastic prizes.

The amount of money it costs to tug the one-armed bandit varies depending on your character’s level—as do the weapon rewards.

Borderlands 2 Slot Machine Cheat

Eridium, character skins and cash are dispensed through the front tray, while weapons are acquired through the side tray on the left.

You can find two slot machines in Mad Moxxi’s bar for double the fun. You’ll also come across them in the wilderness, occasionally hoisted by a rare enemy called the One Armed Bandit.

A handy tip: Play the slots with a group of other players to multiply your cash and Eridium rewards.

Another handy tip: While your friends are doing their shopping in Sanctuary, just head on to Moxxi’s bar and gamble while you wait. Money has little use apart from buying ammunition and rare items from stores and you’ll always find more cash to buy ammo should you ever run out.

The odds may always be in the house's favor, but it's not like you've anything else to do with your money.

Slot Machine Rewards

Three Psycho Masks : A live grenade. This “reward” is the only one that’ll hurt you by doing more than taking away your money. Be sure to avoid the explosion.

Three Single Eridium : One stack of Eridium (4 pieces)

Three Double Eridium : Two stacks of Eridium (8 pieces)

Three Triple Eridium : Three stacks of Eridium (12 pieces)

More Borderlands 2 Slot Machine Levels Videos

Three Sevens : An uncommon rarity character skin from a weapons manufacturer.

See Full List On Borderlands.fandom.com

Three Bells : More money for you to gamble with!

Three Cherries : Uncommon (Green) weapon

Three Moxxi Symbols : Rare (Blue) weapon

Three Marcus Symbols : Epic (Purple) weapon

Tiny Tina's Lootsplosion Slot Machine - Borderlands Wiki ...

Three Vault Symbols : Legendary (Orange) weapon

A pair of symbols with a bell: A small amount of cash.

A pair of symbols with a non-matching symbol: Common (White) weapon