Slots have moved far beyond the basic three-reel games that populated online casinos in the 1990s. Today’s online slots feature exciting bonus rounds that can deliver large payouts. These bonuses are games within games that may include multipliers, expanding wild symbols, and more. The following guide discusses the best slots with bonus rounds, along with where to find them and how bonuses work.
Top casinos with with free bonus games
Best free slots with bonus and free spins
Slots with bonus rounds are a hugely popular attraction at US online casinos. Before playing for real money, though, you might want to try out their demo versions first. Visit our dedicated free online slots page to play free slot games with bonus rounds no download no registration required.
In the meantime, we’ve reviewed numerous classic and new slot machines searching for those that offer the most entertaining bonus rounds. Here’s our selection of the top online slots with the best bonus features:
1. Big Bonus slot
What better way to start this list than with a title that is synonymous with our main subject? From Inspired Gaming, Big Bonus is a six-reel, 50-payline slot that revolves around colorful fruits. It doesn’t have any features during the main game. True to its name, though, Big Bonus offers an action-packed bonus round. Its maximum payout is worth 12,500x your bet.
Big Bonus slot bonus round
You trigger the bonus by getting three-plus scatter symbols anywhere on the reels. This feature begins with you selecting one of the triggering scatters to reveal a multiplier value. The multiplier, which can be worth 20x, 25x, 30x, 50x or 100x, applies to free spins payouts.
Free spins begin after this pick ’em round and continue until you win more than the multiplier value. If you uncover a 30x multiplier, for example, then the ending payout must be worth 30x your stake. Free spins also offer wild symbols that lock into place (aka sticky wilds) for the entire bonus. Overall, we find that Big Bonus offers an interesting set of free spins. The concept of the free games guaranteeing more than your multiplier value is intriguing.
2. Banana Splits slot
From High 5 Games, Banana Splits is a three-by-three slot with cluster payouts. Eighteen-symbol clusters are possible because up to two symbols can land in each position. The maximum you can win is 277x your stake. Despite the small max payout, Banana Splits is still fun thanks to its colorful graphics and stellar animations.
Banana Splits bonus round
You unlock the bonus by landing five-plus scatter symbols anywhere on the grid. You’ll receive seven or 10 free spins for five or six scatters, respectively. The bonus offers enhanced payouts and a sticky wild symbol. You can score the game’s top prize in this round thanks to the larger wins.
Again, we’re disappointed that the bonus only pays up to 277x your stake. We still had fun playing this High 5 Games slot, though, thanks to the sticky wilds and overall atmosphere.
3. Monopoly 250k
Many Monopoly slot titles exist throughout the gambling world. However, SG Digital’s Monopoly 250k is distinct because it offers many bonuses and a top payout of $250,000. You can win the $250K prize on any spin within the base game. Bonus rounds include Community Chest, Electric Company, Go to Jail, Railroad and Big Wheel. The latter is the focus of this section due to its prizes.
Monopoly 250k bonus round
The Big Wheel bonus requires you to land three Big Wheel bonus symbols on the grid. These symbols can only land in the center, top-left and bottom-right positions, which doesn’t happen often on this SG Digital slot game. The wheel features various spaces that relate to the Monopoly game board. You can win properties worth up to 4,000x the line stake, along with any of the other four bonuses.
This bonus round is genuinely fun to play and offers worthwhile prizes. Our only complaint is that triggering it requires lots of luck and doesn’t happen often.
4. Amazing Ripley’s Believe It or Not slot
A Spin Games title, Amazing Ripley’s Believe It or Not takes you out for an evening in Vegas. This five-reel, 27-payline game offers four jackpots — Bronze, Silver, Gold and Diamond. You can win these prizes through four separate wheel bonuses. These bonuses, which represent respective jackpots, connect with other bonuses, including trivia and free spins.
Amazing Ripley’s Believe It or Not bonus round
You trigger one, two or three Mystery Picks by landing three, four or five Mystery Pick symbols on the reels. Each pick represents a bonus, and your selections can reveal instant prizes, free spins, trivia and a wheel bonus. The trivia round is particularly interesting because it lets you answer questions for instant payouts. The wheel bonuses offer different prizes, including jackpots. You can win the largest jackpot through the diamond wheel.
We feel that “amazing” accurately describes the bonuses available in Amazing Ripley’s Believe It or Not. Aspects like the Mystery Picks and the trivia round add fun elements.
5. Chilli Mama’s slot
Chilli Mama’s is available at the following sweepstakes casinos – LuckyLand Slots and Chumba Casino. It differs from all other games on this list, which are available at real money online casinos. A five-reel, 50-payline slot, Chilli Mama’s doesn’t offer many features, but it does have colorful graphics and a festive Tex-Mex atmosphere.
Chilli Mama’s bonus round
The bonus round triggers when you land three scatter symbols anywhere on the reels. It offers 10 free spins with premium symbols in reels one to four and a guaranteed wild symbol in reel five. The wild symbol is stacked, meaning it covers all three positions in the fifth reel.
Chilli Mama’s may not offer the most features, but its bonus game is certainly entertaining. The guaranteed stacked wild helps bolster payouts throughout free spins.
6. Family Guy slot
An IGT slot, Family Guy is based on the hit animated TV series. It does a good job of embodying “Family Guy” with soundbites and cutscenes. This five-reel, 30-payline slot offers features based on characters like Brian, Lois, Peter and Stewie. It offers a potential maximum jackpot of $192,000 (based on the max bet).
Family Guy bonus round
Besides the character features, Family Guy offers three bonus rounds — Drunken Clam, Chicken Fight and Lois’ Hot Spins. Drunken Clam sees you pick characters and beer taps to reveal prizes. Chicken Fight involves selecting prize options after Peter and a giant chicken fight. Lois’ Hot Spins provides 10 free spins and a heart collection system that awards more wild symbols.
7. Holy Diver Megaways slot
Holy Diver is a six-reel slot from Big Time Gaming that offers up to 586,971 ways to win. The theme is based on a Dio song of the same name. Holy Diver includes a small screen at the bottom, which shows the hero opening treasure chests as you play. The chests contain modifiers, such as wild symbols and expanding wilds. You can win up to 23,306x your stake in this game.
Holy Diver bonus round
In addition to modifiers, chests can also contain gems that fill your shield (located on the screen’s left side). You’ll unlock free spins upon filling the Shield of Fortune with four gems. You can either accept the free spins or level up for more maximum ways. The three stages are Level 1 (117,649 ways), Level 2 (396,900) and Level 3 (586,971).
Overall, we love Holy Diver’s role-playing feel and level-up concept. The level-up element lets you either seek short-term satisfaction or wait for extra ways and the potential for a larger bonus.
8. Bier Haus slot
Bier Haus is a five-reel, 40-payline slot from WMS Gaming. It takes you inside a German beerhouse. This game doesn’t have many features, but it does offer stellar symbol graphics and a nice atmosphere. Bier Haus’ maximum payout is just $1,200 on a $4 max wager.
Bier Haus bonus round
You trigger free spins by getting five-plus scattered wild symbols on adjacent reels, beginning with reel one. Triggering wilds become sticky and replace whatever symbols are beneath them. The extra wilds definitely help with regard to claiming bigger payouts.
Bier Haus is an older online slot that doesn’t have much win potential. However, its bonus round is solid and provides enough extras to stand out.
9. Da Vinci Diamonds slot
An IGT slot, Da Vinci Diamonds has an interesting combination theme involving diamonds and Leonardo da Vinci’s artworks. This five-reel, 20-payline slot has tumbling reels, where winning symbols disappear and allow for more chances to win. You can win up to 5,000x your stake if everything goes right.
Da Vinci Diamonds bonus round
Bonus symbols can land on reels two and three of this IGT slot. You’ll trigger free spins by getting three-plus bonus icons on one of these two reels. You receive two to four free spins for three bonus symbols, four to 10 spins for four and eight to 15 spins for five. During this bonus, artwork symbols act as scatters and can deliver payouts from anywhere on the board.
The latter aspect is what sets Da Vinci Diamonds’ bonus apart from others. The artwork symbol scatter prizes provide a solid boost to your winnings.
10. Lobstermania 2 slot
Yet another IGT game, Lobstermania 2 continues the adventures of Lucky Larry — a skilled lobster fisherman. It’s a five-reel, 40-payline slot that can deliver prizes of up to $222,000 on a max wager. Lobstermania has turned into a three-game series in large part due to its multiple bonuses. You get to choose from one of two bonus rounds when the opportunity becomes available.
Lobstermania 2 bonus round
You trigger the Lobstermania 2 bonus picker by landing three game logos in reels one, two and three. You’ll visit a new screen where you pick one of two bonuses. The buoy bonus lets you dive for lobsters (prizes) in Australia, Brazil or Maine. If instead you select free spins, you’ll get five free games and a “rich” reels feature.
Lobstermania 2 does a great job with the bonus rounds. It gives you the choice between two bonuses — both of which are distinct and entertaining.
How bonus games and free spins works
Bonus rounds give you a “free” chance to win prizes. We use quotes because the return-to-player rate already factors in potential bonuses. Nevertheless, these minigames provide a chance to win money without risking your bankroll.
Of course, you need to first trigger a bonus before playing it. One slot can differ from the next regarding how you unlock the bonus game. Additionally, each bonus round can work differently from the next. Some may offer free spins, while others take you to a pick ’em screen (similar to Lobstermania).
Here’s a brief example of how a bonus round might work for a slot:
- Three scatter symbols land on the reels and trigger the bonus.
- This particular bonus game provides 10 free spins with expanding wilds and win multipliers.
- The win multipliers can go as high as 100x and apply to each spin’s total payout.
- You play the free spins and win 120x your bet.
- The 120x payout goes directly into your bankroll after the bonus is finished.
How to trigger the bonus games online
As we mentioned, each slot can have its own triggering method for bonuses. The most common way involves three scatter symbols landing anywhere on the reels. You may receive an enhanced bonus for additional triggering scatters. Here are some other ways:
- Scatter symbols in specific reels/positions: For example, a game might require you to land scatter symbols in reels one and five simultaneously.
- Collect symbols: Certain real money slot games have a symbol collection mechanism. Once you collect enough symbols, you’ll trigger a bonus or minor feature (expanding wilds, say).
- Random: Some games automatically deliver a bonus round randomly. For instance, an online slot might trigger the bonus on one out of every 200 spins on average.
- Feature buy: More and more slot developers are letting players buy the bonus round. You might, for example, be able to purchase the feature for 100x the stake. The bonus will then automatically trigger on the following spin.
To learn more about how slot machines work and the easiest slots to bonus, be sure to visit our How to Win at Slots page.
Most popular bonus games available on slot machines
The gambling world offers several types of common slots bonus rounds. These bonuses include everything from pick ’em rounds to spinning wheels.
- Free spins: You get a certain number of free spins and use them to attempt to generate winnings. Some free spins come with modifiers, including extra wild symbols and win multipliers.
- Hold and spin: This bonus typically begins with three spins. You spin the reels, and certain symbols stick to them. A hold-and-spin bonus continues until you run out of spins or fill the grid with symbols.
- Pick ’em: A pick ’em round involves choosing different symbols or objects to reveal prizes. It can offer instant payouts, multipliers or free spins.
- Second screen: You visit a second screen to play a minigame. The Amazing Ripley’s Believe It or Not Trivia game is an example of a second-screen bonus.
- Wheel: You spin a wheel to win a prize. Prize options could be a payout, free spins, a multiplier or something else.
What makes a game’s bonus round good?
A quality slots bonus game will offer several aspects:
- Big win potential
- Fun qualities
Slots bonuses don’t have to deliver life-changing money to be entertaining. They should, however, offer big enough wins to get you excited (say, 5,000x the stake or better).
Modifiers, which are common in free spins, can include expanding wilds, spreading wilds, tumbling reels, and win multipliers. They increase the excitement and potential prize for any bonus game.
Finally, the best bonuses have distinct aspects that differ from the pack. Lobstermania 2’s buoy bonus is a nice example of this point. It sees Lucky Larry dive for lobsters and prizes in Australia, Brazil, or Maine. No other online slot can match the feel of this bonus.