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Double Ball Roulette
Introduction
Double Ball Roulette plays like regular roulette, except with two balls. I first saw the game at the 2013 Global Gaming Expo and later at the Tropicana in Las Vegas on February 18, 2014. The Tropicana uses a doublezero wheel.
Later, in November, 2016, I noticed it at an Internet casino using Felt software. Felt uses a singlezero wheel.
You might wonder about how they keep the balls from hitting each other in a physical game. The game uses compressed air to shoot the two balls out of a tube almost simultaneously. They travel at the same speed so the second ball always trails the first one.
You might also wonder if the probability of the two balls landing in the same number is about the expected 1/38, assuming they the two outcomes were completely independent. At least I wondered this and annoyed the game maker with physics questions at the gaming show for much too long about it. He assured me that an independent lab did tens of thousands of spins and the probability of the two balls landing the same number is about the expected 1/38, assuming they two outcomes were completely independent.
The betting layout is mostly the same as standard roulette. With the inside bets, the player has two chances to win, but the pays are less. On the outside bets, both balls must win, but the pays are more. In addition the player may bet that both balls will land in any one number.
Rules
General Rules
 An ordinary single or doublezero wheel is used.
 Most of the layout is the same as conventional roulette.
 Two balls are used.
 Both balls must be successful for "outside" bets to win. For example, for a bet on Red win, both balls must land in a red number.
 Either ball must be successful for "inside" bets to win. The player will win twice as much if both balls result in a successful outcome.
 For the "Double Ball Jackpot" bet to win, both balls must land in the selected number.
 A remotecontrolled button is given to a player to activate the air gun shooting the balls.
Available Bets
 Red, Black, Odd, Even, 1 to 18, 19 to 36 — Pays 3 to 1 if both balls land in the chosen 18 numbers.
 1st 12, 2nd 12, 3rd 12 — Pays 8 to 1 if both balls land in the chosen 12 numbers.
 1 red, 1 black — Pays 1 to 1 if one ball lands in a red number and the other black.
 One Number — Pays 17 to 1 if either ball lands in the chosen number, and 34 to 1 if both do.
 Two Number — Pays 8 to 1 if either ball lands in the chosen number, and 16 to 1 if both do.
 Three Number — Pays 5 to 1 if either ball lands in the chosen number, and 10 to 1 if both do.
 Four Number — Pays 3 to 1 if either ball lands in the chosen number, and 6 to 1 if both do.
 Five Number — Pays 5 to 2 if either ball lands in the chosen number, and 5 to 1 if both do.
 Six Number — Pays 2 to 1 if either ball lands in the chosen number, and 4 to 1 if both do.
 Double Ball Jackpot — Pays 1,200 to 1 if both balls land in the selected number.
Below are scans of the rack card. Click either image for a larger version.
DoubleZero Analysis
Outside Bets
The following tables show my analysis of the Outside bets on a doublezero wheel. For outside bets both balls must land in a winning number for the bet to win.
The next table shows my analysis of all bets with 18 winnings numbers, namely red, black, odd, even, low (1 to 18), and high (19 to 36).
All 18Number Outside Bets — DoubleZero Wheel
Event  Pays  Combinations  Probability  Return 

Win  3  324  0.224377  0.673130 
Loss  1  1,120  0.775623  0.775623 
Total  1,444  1.000000  0.102493 
The next table shows my analysis of all bets with 12 winnings numbers, namely first, second, and third 12, and first, second, and third columns.
All 12Number Outside Bets — DoubleZero Wheel
Event  Pays  Combinations  Probability  Return 

Win  8  144  0.099723  0.797784 
Loss  1  1,300  0.900277  0.900277 
Total  1,444  1.000000  0.102493 
The next table shows my analysis of all singlenumber bet on a doublezero wheel.
All SingleNumber Outside Bets — DoubleZero Wheel
Event  Pays  Combinations  Probability  Return 

Win  1200  1  0.000693  0.831025 
Loss  1  1,443  0.999307  0.999307 
Total  1,444  1.000000  0.168283 
The next table shows my analysis of the red/black bet on a doublezero wheel. One ball must land in red and the other in black.
Red/Black Bet — DoubleZero Wheel
Event  Pays  Combinations  Probability  Return 

Win  1  648  0.448753  0.448753 
Loss  1  796  0.551247  0.551247 
Total  1,444  1.000000  0.102493 
Inside Bets
The following tables show my analysis of the Inside bets on a doublezero wheel. For inside bets only one ball must land in a winning number for the bet to pay. If both land in a winning number, the bet pays twice as much.
The next table shows my analysis of all onenumber bets.
All 1Number Inside Bets — DoubleZero Wheel
Wins  Pays  Combinations  Probability  Return 

2  34  1  0.000693  0.023546 
1  17  74  0.051247  0.871191 
0  1  1,369  0.948061  0.948061 
Total  1,444  1.000000  0.053324 
The next table shows my analysis of all twonumber (split) bets.
All 2Number Inside Bets — DoubleZero Wheel
Wins  Pays  Combinations  Probability  Return 

2  16  4  0.002770  0.044321 
1  8  144  0.099723  0.797784 
0  1  1,296  0.897507  0.897507 
Total  1,444  1.000000  0.055402 
The next table shows my analysis of all 3number (street) bets.
All 3Number Inside Bets — DoubleZero Wheel
Wins  Pays  Combinations  Probability  Return 

2  10  9  0.006233  0.062327 
1  5  210  0.145429  0.727147 
0  1  1,225  0.848338  0.848338 
Total  1,444  1.000000  0.058864 
The next table shows my analysis of all 4number (corner) bets.
All 4Number Inside Bets — DoubleZero Wheel
Wins  Pays  Combinations  Probability  Return 

2  6  16  0.011080  0.066482 
1  3  272  0.188366  0.565097 
0  1  1,156  0.800554  0.800554 
Total  1,444  1.000000  0.168975 
The next table shows my analysis of the 5number bet (on 0,00,1,2, and 3).
5Number Inside Bet — DoubleZero Wheel
Wins  Pays  Combinations  Probability  Return 

2  5  25  0.017313  0.086565 
1  2.5  330  0.228532  0.571330 
0  1  1,089  0.754155  0.754155 
Total  1,444  1.000000  0.096260 
The next table shows my analysis of all 6number (double street) bets.
All 6Number Inside Bets — DoubleZero Wheel
Wins  Pays  Combinations  Probability  Return 

2  4  36  0.024931  0.099723 
1  2  384  0.265928  0.531856 
0  1  1,024  0.709141  0.709141 
Total  1,444  1.000000  0.077562 
Strategy
My advice in any game is to go for the bets with the highest expected return. In the case of a doublezero wheel, the best bet is the inside bets on one single number, at a house edge of 5.33%. The two and threenumber bets are not much worse at 5.54% and 5.89% respectively.
I would be remiss in my duties if I didn't say that the house edge in standard doublezero roulette is lower at 5.26%. However, this is only 0.07% lower than the singlenumber inside bet in Double Ball Roulette.
SingleZero Analysis
Here are a couple screenshots of the singlezero Double Ball Roulette game by Felt Gaming. Click on either image for a larger version.
Outside Bets
The following tables show my analysis of the Outside bets on a singlezero wheel. For outside bets both balls must land in a winning number for the bet to win.
The next table shows my analysis of all bets with 18 winnings numbers, namely red, black, odd, even, low (1 to 18), and high (19 to 36).
All 18Number Outside Bets — SingleZero Wheel
Event  Pays  Combinations  Probability  Return 

Win  3  324  0.236669  0.710007 
Loss  1  1,045  0.763331  0.763331 
Total  1,369  1.000000  0.053324 
The next table shows my analysis of all bets with 12 winnings numbers, namely first, second, and third 12, and first, second, and third columns.
All 12Number Outside Bets — SingleZero Wheel
Event  Pays  Combinations  Probability  Return 

Win  8  144  0.105186  0.841490 
Loss  1  1,225  0.894814  0.894814 
Total  1,369  1.000000  0.053324 
The next table shows my analysis of all singlenumber bet on a singlezero wheel.
All SingleNumber Outside Bets — SingleZero Wheel
Event  Pays  Combinations  Probability  Return 

Win  1200  1  0.000730  0.876552 
Loss  1  1,368  0.999270  0.999270 
Total  1,369  1.000000  0.122717 
The next table shows my analysis of the red/black bet on a singlezero wheel. One ball must land in red and the other in black.
Red/Black Bet — SingleZero Wheel
Event  Pays  Combinations  Probability  Return 

Win  1  648  0.473338  0.473338 
Loss  1  721  0.526662  0.526662 
Total  1,369  1.000000  0.053324 
Inside Bets
The following tables show my analysis of the Inside bets on a singlezero wheel. For inside bets only one ball must land in a winning number for the bet to pay. If both land in a winning number, the bet pays twice as much.
The next table shows my analysis of all onenumber bets.
All 1Number Inside Bets — SingleZero Wheel
Wins  Pays  Combinations  Probability  Return 

2  34  1  0.000730  0.024836 
1  17  72  0.052593  0.894083 
0  1  1,296  0.946676  0.946676 
Total  1,369  1.000000  0.027757 
The next table shows my analysis of all twonumber (split) bets.
All 2Number Inside Bets — SingleZero Wheel
Wins  Pays  Combinations  Probability  Return 

2  16  4  0.002922  0.046749 
1  8  140  0.102264  0.818115 
0  1  1,225  0.894814  0.894814 
Total  1,369  1.000000  0.029949 
The next table shows my analysis of all 3number (street) bets.
All 3Number Inside Bets — SingleZero Wheel
Wins  Pays  Combinations  Probability  Return 

2  6  16  0.011687  0.070124 
1  3  264  0.192841  0.578524 
0  1  1,089  0.795471  0.795471 
Total  1,369  1.000000  0.146822 
The next table shows my analysis of all 4number (corner) bets.
All 4Number Inside Bets — SingleZero Wheel
Wins  Pays  Combinations  Probability  Return 

2  6  16  0.011687  0.070124 
1  3  264  0.192841  0.578524 
0  1  1,089  0.795471  0.795471 
Total  1,369  1.000000  0.146822 
The next table shows my analysis of all 6number (single street) bets.
All 6Number Inside Bets — SingleZero Wheel
Wins  Pays  Combinations  Probability  Return 

2  4  36  0.026297  0.105186 
1  2  372  0.271731  0.543462 
0  1  961  0.701972  0.701972 
Total  1,369  1.000000  0.053324 
Strategy
As with any game of pure luck, all you can do for yourself is to make the bets with the lowest house edge. In this case it is the singlenumber inside bet, with a house edge of 2.78%. If that is too volatile for you, the doublenumber inside bet is not much higher at 2.99%
Internal Links
 Double Action Roulette — Similar game, but with one ball and two wheels.
External Links
 — Site by the makers of the game.
 — Discussion about Double Ball Roulette in my forum.
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