Game developers have become incredibly creative when it comes to adapting the game of roulette, and bonus rounds are a popular option for a company who want their next title to be a little different from the rest.
Especially popular with themed versions of roulette, bonus rounds are a triggerable extra game that plays out once certain conditions have been met in the base roulette game. Most often this simply means you bet on an added ‘bonus’ space on the wheel and the ball lands on it.
The bonus round itself can then be pretty much anything the developer wants it to be, from a mini slot to a pick me game and anything in-between, but it will often include a number of bet multipliers or total winnings multipliers to determine the eventual prize. Saying that, the bonus round could alternatively include a fixed prize or even be the way a jackpot is won, there really are no rules here.
The basic idea though, is that the bonus game won’t trigger often, but when it does it can offer much higher payouts than a regular winning roulette bet.
The game randomly selects between 1 and 15 'special numbers' as the wheel spins, and if you have a straight up single number bet on one of those numbers you stand a chance of entering the bonus round.
This bonus round will trigger if the ball lands on a special number and you also have a straight up bet on it.
When this happens, you will need to spin a multiplier reel that will reveal a multiplier amount between 10x and 500x, and that amount will then stand as your minimum win for the bonus round. However, it is perfectly plausible that you could win more than that amount.
The game will randomly place bets for you before the wheel spins, and will add more chips for each new spins. The wheel will keep spinning and further chips will be added until you equal your minimum multiplier amount or surpass it.
At this point the bonus round ends, you collect your winnings, and base game resumes.
An RNG will select between 1 and 10 Millionaire numbers before each spin, and each one will be given a symbol that either grants a multiplier, or trigger a bonus round called the Millionaire game.
Only inside bets on the numbers qualify for this bonus game.
Once the game begins, it is a case of guessing which of the four answer tiles, A, B, C, or D is hiding the biggest multiplier.
This continues for 5, 8 or 10 rounds depending on how you got access to the bonus round, but as the game goes on, multipliers begin to be replaced with red crosses, and if you pick a letter that is hiding one of these, your bonus game is over.
Multipliers are added together after each round, so players will always win something from the Millionaire game, but to get the biggest multiplier you need to guess well and stay in the game until the final round.
There's a lot going on in this game as it not only has an extra space on the wheel and a bonus game, but it is branded and also has two randomly activated jackpots attached.
The wheel has an extra slot to allow for the bonus round bet, and in order to access the bonus round the player must place a bet on this extra bonus slot and the ball must land on it. If the ball lands on the bonus space but there is no bet on it then the bonus round will not be played.
The bonus round itself requires the player to turn around hexagons to reveal either a cash prize of between 1x and 5x your bonus stake, or a terminator head which will boost your total bonus winnings by 1x for each head revealed.
Based on American roulette, this game introduces yet another extra slot onto the wheel that is 1.5 times the size of all the others, making it more likely to hit.
This is the bonus slot, and if you bet on it and the ball lands there, not only is there a payout, but a bonus spin is triggered, utilising a second wheel and allowing two numbers to win at the same time.
Through various combinations there is the possibility to win up to 1200x your bet here, and the game includes a few extra bet types too that you won't be used to seeing.
The betting board for Big 500x Roulette has an extra space to bet on, and a corresponding extra space on the wheel.
If you have bet on this extra bonus space and the ball lands on it, the bonus round begins and you are given a 500x multiplier to try and get through 3 rounds of the bonus game.
At each stage, you must choose how to split your multiplier across different drop zones. Once your decision is made the RNG will show which drop zone goes forward to the next stage, and whatever portion of the multiplier you have placed there is saved. Amounts in other drop zones are lost.
Whatever you have left at the end is your winning multiplier amount.
There is an extra space to bet on in World Cup Roulette, and an additional extra space on the wheel that matches up with it.
If the ball lands on this extra space then the bonus round begins - provided you have bet on it of course - and you have to retain as much of a 500x multiplier as possible.
The bonus round is in the form of a penalty shootout, and you have to place multiplier amounts around the goal across three rounds. At each stage the keeper will take some of your multiplier amounts as he 'saves' the penalty, but anything you are left with at the end is your to keep.
This means your bonus multiplier can be anything from 0x to 500x depending on how you choose to play the game.
There are actually two bonus rounds you can trigger in this game, but you must place chips on the bonus bet space on the board to qualify for either of them.
There is a glowing outer ring that will spin in time with the regular wheel and it has 2 symbols on it; a phone and a mystery box. If either of these symbols line up with the winning number on the roulette wheel, then the corresponding bonus round is triggered.
The first is similar to the game show and you must open boxes to reveal values and accept or decline offers from the banker. The maximum potential win here is 150x.
The second is another box picking game, but the 3 boxes available will hold a small, medium, or high multiplier amount. If you aren't happy with what you get you can select 'No Deal' and try again, but you only get 3 chances. The maximum potential win here is 101x.
Players choose up to 12 'golden' numbers before each spin, and if they place an inside bet on these numbers and the ball lands on one of them, then the bonus round begins. This is in place of a regular payout.
The bonus game consists of an outer wheel, and an inner wheel.
The outer wheel gives the opportunity to either add extra pointers to the inner wheel or boost the multipliers on the inner wheel by 2x. It can also give you no extra benefits, so there is a 2 in 3 chance of increasing your lot.
The inner wheel shows various multiplier amounts that can be won, but the wheel can also end up being triggered to respin, in which case the multipliers will be added together to increase your winning amount. The very least you can win is 6x.
As well as the bonus round, this game also has jackpots and a very strong theme - Superman.
To play for the bonus round though, you must first select up to 12 special numbers. If the ball lands on one of them and you have bet on it, then you won't get a payout but the bonus round will begin instead.
You will have to pick Superman symbols to turn around and they will each reveal either a multiplier or a symbol, but you only have a limited number of picks. The multiplier is applied to your stake, but the symbol resets the count and also boosts the multiplier amounts that are remaining.
The most you can win here is 725x, but the least is just 5x.
The bonus round in Monopoly Roulette is actually it's own stand alone game, but in order to trigger it the ball must land on a red number. This means the bonus round triggers frequently.
Players place bets on both the roulette wheel and the Monopoly bonus game before each spin of the wheel, and bets on the Monopoly game remain active for 4 spins before they are lost, so you either need to trigger the bonus game or spin four blacks in a row to lose those bets. There is just a 7% chance that bonus bets will be lost before the bonus game triggers.
In the bonus game, you get 3 rolls of the dice, and if Mr Monopoly lands on properties you had a bet on then you win the corresponding multiplier amount. Passing go resets the 3 spins.
The round can end prematurely by getting a tax bill or going to jail, and the properties are worth between 1.7x and 28x when you land on them.
As well as having the titular progressive jackpot attached, Frankie Dettori's Jackpot Roulette also contains a bonus round accessed by betting on a special extra symbol on the wheel and betting board.
If the ball lands in this extra space but you have not bet on it then you will miss out on the bonus round.
During the round, you will have to choose from 20 places on a racetrack. They will either reveal a cash prize multiplier between 1x and 5x your stake, or a trophy symbol which multiplies your total winnings by between 1x and 7x, creating a maximum win potential of 280x.
The other thing that happens when you reveal a trophy symbol is that a short clip of one of Frankie Dettori's famous wins will play which is quite fun.
This game can be played live or as an RNG version, and both have a progressive jackpot attached as well as a bonus round.
To trigger the bonus round you must place a winning bet on the Age of the Gods space on the betting board, which has a corresponding extra slot on the wheel.
If this happens then you will go through to the bonus round in which you spin a mini slot 3 times. The slot contains 8 different God symbols worth between 5x and 100x, and you need to line up 3 matching symbols to bag the multiplier attached to them.
At least one of your three reel spins will be a winner but you could also win all three, but the symbols you get are totally random, so the minimum payout would be 5x and the maximum would be 300x.