The Best Slot Machines With Bonus Games (2025)

Online slot games have come a long way since the simple mechanical reels of the original Liberty Bell machine. Modern technology has brought full-blown adventures with exciting bonus games and special features.

These modern online slot features attract a new fan base with innovative gameplay and impressive win potential. These bonuses offer multi-layered challenges, saved game progression, and clever mechanics that make full use of modern technology. 

Today’s slots offer much more than paylines and scatter symbols; they immerse you in themes and storylines with dedicated bonus arenas, where mini-games are unlocked, and new symbols and game modifiers are introduced. 

What bonus games does 2025 have in store for slots fans? Let’s reveal the best slot machine bonus games and where to play.

Popular Slot Machine Bonus Games

Online slot bonus games come in many shapes and sizes, offering different ways to win, special symbols, jackpots, and multipliers. Here are the common ones to look out for.

Free Spins Bonus

Free spins bonus games are often triggered with scatter symbols in the base game. They generally include some type of enhanced game modifiers that can increase your chances of hitting wins with boosted values. You might encounter multipliers, wilds, expanding reels, or other bonus symbols. 

Hold and Win Respins

Usually, respins are played on modified reels and are reset with each new bonus symbol. Many respin games include fixed jackpots and cash prize symbols that lock in place and are collected and awarded at the end of the round.

Cash Collect Games

Most cash-collecting style bonus features are active in the base game. They involve cash prize symbols that are collected by special collect symbols when both land on a spin. Many leading studios, such as Playtech and Blueprint, have developed game series based on the cash collect mechanic.

Best Slot Providers For Bonus Games

When it comes to bonuses, some studios stand out for their creative mechanics that go beyond traditional slot gameplay. The following are worth keeping an eye on for innovative bonus games:

ELK Studios

Known for its creative flair and layered gameplay, ELK’s Nitropolis and Pirots series are fan favorites, offering chaotic, high-energy features with millions of ways to win in quirky formats.

Relax Gaming

Relax’s bonus games have proven so popular that they spawned their own spin-off games. See the Money Cart slots that followed the Money Train series.

Blueprint Gaming

Blueprint is the king of multi-level bonus games, layering pick-and-click features into progression-trail-based bonuses, or progressive jackpots via the Jackpot King network. Hits like The Goonies, King Kong Cash, and Fishin’ Frenzy showcase their flair for fun and exciting gameplay.

Nolimit City

Nolimit City is known for edgy themes, exclusive mechanics, and high-octane bonus rounds. Top titles, like San Quentin and Tombstone RIP, boast intense volatility and massive win potential, reaching as much as 300,000x.

Top Slot Bonus Games of 2025

So, what’s topping the bill so far in 2025? Check out the following titles to see the best bonus games of the year so far, according to popularity and our team of experts: 

• Le King: Hacksaw Gaming
• Tomb of Gold 2: Play’n GO
• Sugar Sands: Skywind
• 777 Diamond Strike: Red Tiger 
• Gem Trio: Pragmatic Play
• Iron Phoenix: Push Gaming

Online Casinos to Play Bonus Slots

Ready to explore these exciting games and experience the fun for yourself? Check out the online slots available at these popular sites:

BetMGM Casino: A favorite online casino brand, BetMGM offers a huge bank of online slots from most of the industry’s leading providers, delivering a wealth of choice to experience all types of bonus games.

BetRivers Casino: BetRivers has an impressive lobby, offering many bonus-rich titles. You can play slot tournaments against fellow players and join a multi-tiered loyalty programme to earn generous rewards. 

FanDuel Casino: FanDuel is one of the country’s leading casinos, featuring exclusive games, an up-to-date slots lobby, and plenty of opportunities to play popular promos. 

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