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.
Borderlands 2 Slot Machine Gambling Guide - Gameranx
What can you win from the Slot Machines? You can spend money and spin the slot machine to try and win prizes. Your winnings depend on the combinations you get. Prizes can range from cash, to green (uncommon) guns, blue (rare) guns, orange (legendary) guns, Eridium and more Slot Machine Odds of winning a prize. See: Moxxi Slot Machines Odds.
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.
