Week 36 New Online Casino Games September 2025 – 32 New Releases

For the second week running, we have 32 new casino games to bring you; however, this time, they’re not just slots. There’s two games that offer something completely different. One is a multiplayer crash game involving King Kong, and the other is a quick and easy Wheel Game that lets you choose your volatility before playing.

As for the biggest slots hitting the casinos last week, some of the best are sequels such as Bill & Coin: Mummy Mischief 2, Star Clusters 2, Book of Madness 2 and Fire Toad 2. There’s also a new Coins slot from Wazden and releases from Play’n Go and Pragmatic Play that we know will hit the spot for many slot lovers.

Age Restrictions: Players must adhere to the legal gambling age in their jurisdiction. In many countries this starts at 18, but some regions require individuals to be 21 or older before they can legally gamble.

Top Five Slots & Pokies September 3 to September 8 2025

(Rated by the Casinoplusbonus EN team)

This week was even tougher than usual to whittle down. There were just too many standout launches across studios big and small. After a lively debate (and a final team vote), we finally managed to lock in our Top 5. Below you’ll find a quick review of each pick, covering their headline features, max wins, RTPs and exactly why they earned a spot in this week’s list.

As for some honourable mentions, these are a few slots that would have made the top 5 on most other weeks:

• Rise of Olympus Extreme (Play’n GO)
• Star Clusters 2 (Big Time Gaming)
• Lobster House (Pragmatic Play)

Our previous report: If you missed last week’s coverage, don’t worry as fresh slots are rolling in nonstop. Once you’ve sampled this week’s winners, circle back to the previous Week 35 New Online Casino Games September roundup for more brand-new titles to spin.

Book of Madness II Slot (Gamomat)

Book of Madness II by Gamomat is a horror-themed slot and pokie that brings the popular ‘Book of’ mechanic into a dark and eerie setting. You’ll be spinning reels filled with blood-soaked symbols, sinister characters, and the book itself, which acts as both a wild and a scatter. Every win gives you two options to gamble, plus there’s the trademark Book-themed slot free spins with expanding symbols. As for the gameplay, it is set on a 5×3 slot with 10 paylines, high-volatility gameplay, and a 96.15% RTP.

Game Features Explained

• Wild & Scatter (Book Symbol): The book does double duty as it’s both the wild and scatter. As a wild, it substitutes for all regular symbols. As a scatter, landing 3 or more books will trigger the free spins feature.

• Free Spins with Expanding Symbol: When you trigger the free spins, a random symbol is chosen to become an expanding symbol. Each time it appears during free spins, it expands to cover the reel and pays across all 10 lines, even on non-adjacent reels. This is something we are used to seeing on Book-themed slot games, and expected from Book of Madness II.

• Gamble Feature: Gamomat keeps its trademark gamble options. After any winning spin, you can choose between the card gamble, predict red or black or use the ladder gamble, where you can try to climb for higher prizes.

• Bonus Buy: The buy-in cost is a multiple of your base bet, but the RTP remains close to the standard.

We appreciate that Gamomat has retained the classic Book-style mechanics but added a darker edge. The gamble feature is a nice addition after every win, and it keeps the pace moving without waiting for the bonus to land. The free spins round feels familiar but has enough punch to keep it interesting, especially when the expanding symbol is one of the premium icons.

Book of Madness II Free Play Demo

Wolf It Up! (Inspired Gaming)

In the past, it was not often that we had an Inspired online slot reviewed, but lately, we just can’t get enough of this bustling UK brand.And this latest slot game is literally full of action.

Wolf It Up! Again brings players back into the wild with its 5×3 reels and action-packed gameplay. This slot delivers a classic yet thrilling experience, with multiple opportunities to rack up wins across the reels. The game’s features are excellent in our opinion, giving you a mix of wild symbols, multipliers and bonus rounds, and more. Literally, there seems to be something happening on the reels every couple of spins.

Games Features Explained

• Stacked Wilds: The Wild symbol in Wolf It Up! Again, substitutes for all regular symbols, except for the scatter. The Wild symbols can appear stacked on the reels during both the base game and Free Spins. This increases the chances of landing multiple winning combinations in a single spin.

• Multiplier Feature: During Free Spins, each winning spin can be boosted with multipliers of up to 3x, giving you the chance to accumulate much larger payouts. The multipliers remain in place throughout the bonus round, adding even more excitement to your gameplay.

• Free Spins: The Free Spins feature is triggered by landing 3, 4, or 5 scatter symbols anywhere on the reels, awarding you 10, 15, or 20 free spins, respectively. During the Free Spins round, the Wild symbols can trigger further wins, and extra Free Spins can be retriggered by landing more scatters.

• Extra Free Spins: During the Free Spins feature, landing more scatter symbols will award additional Free Spins, increasing your chances to win. You can trigger up to 20 additional spins, extending your bonus round even further.

• Gamble Feature: After any winning spin, you can choose to gamble your winnings for a chance to double or quadruple them. The Gamble feature is a great way to maximize your potential rewards, but remember, it’s a high-risk feature that can also result in losing your winnings if you’re not careful.

• Fortune Bet: This feature allows you to increase your bet, which increases the likelihood of triggering the Free Spins feature. While it costs more to activate, it gives you a higher chance of entering the bonus round, making it a great option for players who want to increase their odds of triggering the big payouts.

• Fortune Spins: Fortune Spins are special bonus spins that you can trigger with [specific conditions]. These spins provide additional multipliers, higher-paying symbols, or extra wilds, giving you more opportunities to win during the Free Spins round. Fortune Spins add extra layers of excitement and increase your chances of landing a big win during the bonus feature.

• Non-Progressive Jackpots: In Wolf It Up! Again, there are four non-progressive jackpots, which can be triggered through the Fortune Spins feature. These jackpots include: Grand Jackpot: Pays 1,000x your bet, Major Jackpot: Pays 50x your bet, Minor Jackpot: Pays 25x your bet, Mini Jackpot: Pays 10x your bet.

• Bonus Buy: For those eager to dive straight into the action, Bonus Buy allows you to purchase access to the Free Spins feature for 100x your stake, skipping the wait for the scatter symbols to land.

Wolf It Up! Again is perfect for players who love a bit of everything. If you’re someone who enjoys both base game features and bonus rounds, this slot keeps things exciting no matter what. The Fortune Bet and Bonus Buy features are great for those who want to increase their chances of hitting the bonus rounds quickly, while the stacked Wilds and multipliers add extra potential for big wins during the Free Spins. The Fortune Spins feature also gives you a shot at non-progressive jackpots. Whether you’re playing for the bonuses or going for those jackpot prizes, Wolf It Up! Again offers something for everyone all in one action-packed adventure.

Wolf It Up! Again Free Play Demo

King Kong Crash Climber (Inspired Gaming)

Yup! Inspired Gaming again. Two in a row! This time, not because it’s an online slot, but literally because it’s a fun, fast-paced, and action-packed multiplier game with one fantasy cult hero in my eyes – King Kong, who I still believe was the inspiration behind Donkey Kong in Nintendo games, including Mario Kart. To explain further, King Kong Crash Climber is a multiplayer crash-style game where players help King Kong climb a tower of multipliers. The goal is to climb as high as possible to maximise your potential multiplier before deciding whether to collect or continue climbing.

Game Features Explained

• Climb Progress: In King Kong Crash Climber, players select a level for King Kong to climb to, with five multiplier options to choose from. Each successful climb adds a higher multiplier to the winnings, progressing you up the tower.

The goal is to climb as high as possible without falling, with the ultimate target being the 1000x multiplier at the top of the tower. However, each level carries risk because if King Kong falls during the climb, you lose.

• Multipliers: The multipliers increase with each level King Kong climbs, giving players a chance to earn progressively larger payouts. As you climb, the multiplier value will rise from 1.2x all the way up to 1000x, with the highest value being available only at the rooftop party.

That leaves the decision up to you whether to keep climbing with the aim of landing bigger multipliers or collect your winnings before risking it on another level. Obviously, that means the higher you climb, the greater the bigger your multiplier, but also, each time you climb, you are risking a loss.

• Spin Chance: If your balance falls below the current cost to play but is still above zero, the Spin Chance feature is triggered automatically, giving you the chance to wager the remainder of your balance for a second chance to win.

The green segment on the meter offers a chance to win a game at the current bet, while the red segment means you’ll lose the remaining balance and exit the round. If you prefer not to use your remaining credit, you can exit Spin Chance by pressing the No Thanks button.

I love this game. King Kong Crash Climber offers a unique and engaging experience, where players must carefully balance risk and reward while climbing toward bigger payouts. The game’s dynamic multiplier system, combined with the Spin Chance feature, keeps things exciting and full of surprises. Whether you’re collecting winnings early or pushing for that 1000x multiplier, each decision adds to the thrill of the climb.

King Kong Crash Climber Free Play Demo

Bill & Coin 2: Mummy Mischief (Relax Gaming)

If you’re familiar with the original Bill & Coin or the Bill & Coin Dream Drop variant, this sequel retains the cash-and-dice comedy but comes with added features. Relax Gaming packs a 6×4 grid with 4,096 ways, tumbling wins, a Win Multiplier that keeps climbing within a spin, and a Bonus Pick that lets you choose Sticky Coins, Multiplier Ladder, or a Book Bonus. There’s also a Super Bonus that bolts all three together.

Game Features Explained

• Wilds & Bone Wilds: Regular Wilds and Bone Wilds substitute for everything except Bonus, Super Bonus, Coin, and Expanding symbols. Bone Wilds can trigger a Dice Roll that adds +1 to +6 to the current Win Multiplier.

• Tumbling Reel with Win Multiplier: Each set of combined symbols that wins during a tumble sequence increases the Win Multiplier. It resets at the start of a new paid spin.

• Coins & Dice: Coins come with a multiplier bet value that pays out once they drop to the bottom row, and those values are boosted by the current Win Multiplier. Dice, triggered by Bone Wilds, add a direct +1 to +6 lift to that multiplier.

• Bonus Pick: Hit 3 Bonus symbols anywhere in view to enter a pick screen and choose one of the three bonus games below. Any Bonus (or Super Bonus) trigger starts with 8 free spins. Collect five ‘Spins’ symbols during a bonus to add +5 spins.

• • Sticky Coins (Bonus Type 1): Coins become sticky and nudge down one row each spin. When they reach the bottom, they pay their x-bet value, multiplied by your current Win Multiplier.
  • Multiplier Ladder (Bonus Type 2): A sticky ladder increases on every regular win and every spin. Dice can boost the entire ladder by the dice value. Ladder steps extend past 500×.
  • Book Bonus (Bonus Type 3): Classic ‘book’ style play: Expanding symbols pay from 3-of-a-kind on separate reels and always pay 10 ways. Collecting five ‘Spins’ symbols also adds one new expanding symbol, up to three expanders active.
  • Super Bonus (Mixed Mode): Trigger by landing 3 Bonus symbols with at least one Super Bonus symbol. You get Sticky Coins + Multiplier Ladder + Book Bonus together.

• Upgrade Spins: You have three optional modes that change how the next spin plays out. Bonus Reels cost 10× your bet and strip the grid to Bonus, Super Bonus, or blank symbols for a higher entry chance. Super Dice Grind costs 5× and guarantees a Dice Bone, with the first Bonus symbol always counting as a Super Bonus. Coin Row costs 25× and guarantees a full row of Coins.
• Buy Feature: The Buy Feature can be triggered straight from the base game, giving two paid entry points. For 100× your bet, you can buy direct access to the Bonus Pick at a 96.50% RTP, while 500× your bet secures immediate entry into the Super Bonus, also running at 96.50% RTP.

Strong mechanical mix with player choice at the bonus door, a clear multiplier engine, and several paid paths to chase the mode you want. Expect swingy runs in base play; most of the real weight lives in Super Bonus or a ladder-and-coins alignment that doesn’t come every spin. If you liked the first Bill & Coin or chased the Dream Drop build, this sequel gives you a cleaner route to the same cartoon chaos, with a bigger max win, unless you are playing the Dream Drop version, of course!

Bill & Coin 2: Mummy Mischief Free Play Demo

Fortune Spin (BGaming)

BGaming’s Fortune Spin is a virtual-style wheel of fortune game show. Instead of reels, you get a vibrant spinning wheel where every round could land you a multiplier win up to 10,000x your stake. With adjustable volatility modes, disappearing empty sectors, and rapid-fire autoplay, this game gives you the reins to control risk and reward. It’s simple to play, and perfect for a break from playing slots.

Game Features Explained

• Game Modes and Volatility: One of the standout features is the ability to change volatility at will:

• • Easy Mode – Max win 25x with low-risk gameplay and a theoretical RTP of 98.05%
• • Medium Mode – Max win 100x, with balanced gameplay and a theoretical RTP of 98%
• • Hard Mode – Max win 500x, with fewer wins but higher wins and a theoretical RTP of 98.02%
• • Daredevil Mode – Max win 10,000x, with ultra-high volatility and a theoretical RTP of 98.03%

• Sectors: The wheel is divided into multiplier and empty sectors. Land on an empty one and it disappears, boosting your odds on the next spin.

• Restoration: When you finally land on a multiplier, all previously removed empty sectors are restored.

• Autospin: Customisable autoplay lets you choose the number of spins and set stop conditions (balance increases, losses, or win caps).

• Quick Spins: Lightning mode accelerates gameplay for faster action.

BGaming’s Fortune Spin is perfect for players who want something different from the usual reels. Its adjustable volatility system makes it suitable for casual players looking for steady returns as well as thrill-seekers chasing massive multipliers.

Fortune Spin Free Play Demo