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Here, we showcase the best online casinos to play slots, considering the following key factors: USA popularity, slot game variety, quality software providers, high RTP slot availability, crypto banking, and new player bonuses. Here is our Casino rating for December 2023:

BitStarz Casino – biggest Slot library

BitStarz is an online casino launched in 2014 that offers over 4,400 slot games to play for free in demo mode or for real money. It features slots from top software providers like Pragmatic Play, BetSoft, NetEnt, and GameArt – 150+ Gaming Studios in total

Some of the popular free slots highlighted include Rise of Samurai IV, Sheriff of Nottingham 2, Jack and the Beanstalk, and Starburst XXXtreme.

Key advantages of BitStarz Casino include:

  • Extensive jackpot network with slots linked across casinos to offer massive prizes
  • Slots with unlimited free spin modes
  • Targeted bonus buying functionality to instantly unlock bonuses
  • Daily tournaments and VIP rewards program

Other notable features covered:

  • Megaways slots with 100,000+ ways to win like Floating Dragon New Year Festival
  • High RTP slots like Secrets of Atlantis (96.1% RTP)
  • Slots with Buy Bonus feature to purchase access to bonuses upfront

BitStarz Casino slots – practice mode:

5 paylines, 5 reels, 5,000X max pay, 
Pragmatic Play

5 reels, 10 paylines, 5000X - max pay
Dragon Gaming

20 paylines, 5 reels, Volatility: Medium, Aristocrat 

20 paylines, 5 reels, 5,000X max pay,

The casino accepts both fiat currencies and cryptocurrencies like Bitcoin and Ethereum. It stands out for fast payouts, generous promotions, and good customer support via live chat. While it lacks phone support and has high bonus wagering requirements, it has won several industry awards.

Crypto Loko – best Crypto Casino

Crypto Loko is a cryptocurrency-focused online casino established in 2020. It offers over 165 provably fair games from Realtime Gaming, including slots, table games, video poker, and specialty games.

170+ slots to play

Crypto-only Casino with an amazing welcome bonus

Some of the most popular slots featured are Fortunate Buddha, Plentiful Treasure, Bubble Bubble 3, and Jackpot Saloon. Game themes range from Asian culture to holidays, myths, and more.

Key features of Crypto Loko:

  • 27 animal-themed slots like Big Cat Links and Ocean Oddities
  • 24 Asian-style slots like Mighty Drums and Zhanshi
  • Megaways slots with 100,000+ ways to win
  • 15 progressive jackpot slots with prizes over $1 million
  • Generous welcome bonus up to $25,000 plus free spins
  • Quick crypto deposits/withdrawals (15 mins) with no limits
  • Mobile compatibility and encryption security

Crypto Loko Casino slots – play in fun mode:

5 reels, 2000X - max pay
Realtime Gaming

5 paylines, 5 reels, 5,000X max pay, 
Pragmatic Play

Scatter Pays, 7 reels, 5,000X max pay, Pragmatic Play

30 paylines, 5 reels, 5,000X max pay, Playtech

While Crypto Loko itself lacks licensing, it uses encryption and partners with a proven software provider. Players’ reviews praise the site’s variety of games, bonuses, fast payouts, and smooth performance. Concerns exist around regulation and support options. But overall Crypto Loko offers a fun, potentially rewarding crypto gambling experience according to most players.

Kats Casino – Best No Deposit Bonus offer

Kats Casino is a new online casino established in 2022 that operates in the US market and is powered exclusively by RTG games. It offers over 220 slots, table games, video poker and specialty games.

Some of the most popular free demo slots featured are Naughty or Nice, Sweet 16, Ghost Ship, and Football Frenzy. There are also megaways slots like Mighty Drums and animal-themed games like Big Cat Links.

Kats Casino No Deposit Bonus:

The casino provides a $120 no deposit welcome bonus and a 4-tier match deposit bonus up to $4,000. There are also daily reload bonuses, a VIP program with 5 tiers, and promotions like 275% match plus 50 free spins during Happy Hour.

Banking options include major credit cards and Bitcoin. Payouts are processed within 4 business days on average. There is a $2,500 weekly withdrawal limit which may be low for big winners.

Kats Casino slots for fun

50 paylines, 5 reels, 50.000X max pay 
RealTime Gaming


5 reels, 50 paylines, 10 000X max win
RealTime Gaming

5 reels, 10 paylines, 50 000X max win
RealTime Gaming

5 reels, 243 ways to win, 50 000X max win

RealTime Gaming

The optimized mobile site and Android app allow playing on the go. As a very new casino, the reputation is not yet fully proven and there is no variety since all games are from one provider, RTG.

But overall Kats Casino offers generous bonuses on a solid RTG platform and seems a great choice for US players, especially those seeking to play their favorite RTG titles.

Lucky Creek Casino – best gaming software

Lucky Creek is an online casino established in 2009 and licensed in Kahnawake, Canada. It uses a Wild West theme across its 300+ games from developers like Rival, Betsoft, and Saucify.

Some popular free demo slots offered are Naughty or Nice, Take Santa’s Shop, 7 Chakras, and Lucky Ox Jackpots. There are also Book of Darkness slot, and high RTP games like Take Santa’s Shop (96.51% RTP).

Instead of a loyalty program, Lucky Creek focuses on sporadic bonus stunts like $2,000 welcome bonus, $50 no deposit free chips, 15% Monday rebates, and 35% Bitcoin match bonuses on Wednesdays.

The casino prioritizes security via SSL encryption and partners with boutique, quality game studios for a curated selection of slots, table games and specialty offerings rather than a high volume.

Play Lucky Creek Casino Slots for free

5 reels, 243 ways to win, 5000X max pay


5 reels, 10 paylines, 1056X - max pay


5 reels, 75 paylines, 360x - max pay Betsoft

5 reels, 49 paylines

While limitations exist around responsible gambling tools and withdrawal terms, Lucky Creek brings a unique gameplay experience that appeals to many casino players.

Red Dog Casino – best RTP value slots

Red Dog Casino is an online casino established in 2019, owned by Infinity Media Group LTD, and powered exclusively by RealTime Gaming (RTG). It offers around 200 games spanning slots, video poker, specialty games, and Visionary iGaming live dealers.

Here we offer the best RTG slots with the highest payout rates for players (RTP) to try for free. As Red Dog’s software vendor RTG does not publish official RTP rates, estimates from industry sources are used:

  1. Caesar’s Empire (97% RTP) – Roman theme with free spins feature and progressive jackpot
  2. Nova 7s (95.7% RTP) – Space theme with 7s symbols and 4 free spin features
  3. Plentiful Treasure (96.5% RTP) – Beach carnival theme with 243 ways to win, free spins, and progressive jackpot
  4. Sweet 16 (96.4% RTP) – Birthday theme with 16 free spins and 2,000x max payout

Popular free demo slots featured include Sweet 16, Fortunate Buddha, Mighty Drums, and Great Golden Lion. There are also Megaways slots, animal themed games like Big Cat Links, and Asian styled slots like Plentiful Treasure.

The casino provides a 280% slots welcome bonus up to $14,000 and 320% match deposit bonus when using crypto. There are also multiple reload bonuses, 15 free spins for new players, and a loyalty program.

Play Red Dog Casino Slots with no Risk:

Reels 5, Paylines 30, Maximum pay - 1,000x,
Vendor - Realtime Gaming

20 paylines, 50 000X - max pay
RealTime Gaming

5 reels, 2000X - max pay
Realtime Gaming

50 paylines, 50 000X - max pay
Realtime Gaming

As a relatively small, boutique RTG casino, game selection is limited compared to larger competitors. But Red Dog focuses on curated quality over quantity and provides generous welcome packages. It caters mainly to slots and video poker fans seeking a smooth RTG experience.

US online casinos

These casinos below are among the popular Brands in the United States based on search popularity (February 2024):

To play real money slots at these Casinos press “Play at the Casino” button, To Start playing games in fun mode choose “Play Demo Games”

How to choose the right casino – Guide

When choosing an online casino to play at, it is extremely important that you take the time to do thorough research to find a reputable and trustworthy site. This decision will directly impact the safety and enjoyment of your overall gambling experience.

Best Online Casinos to play Slots

Independent Reviews

To start, you need to explore trusted review websites, expert evaluations, and user reviews and ratings to gather unbiased information and insights about various online casino options. This will help you understand the strengths and weaknesses of each site.

Security and Licensing

Next, you should assess critical factors like security measures, licensing and regulations, fairness of games, encryption technology, and track records. This analysis will ensure your personal and financial data remains protected.

Gambling Software

Additionally, you need to evaluate game selection and software providers to guarantee you have access to diverse and high-quality casino games that appeal to your preferences.


It’s also essential you analyze bonuses, promotions, loyalty programs, and VIP perks across sites to find the best value. Reading the fine print is a must to avoid any surprises.

Banking Options

Furthermore, reviewing payment methods and withdrawal processes tied to convenience, processing times, and security gives you confidence that transactions will be smooth.

Support and mobile compatibility

Testing customer support channels helps guarantee your queries will be addressed promptly by a helpful and professional team. Finally, checking mobile compatibility and performance across devices will allow you to enjoy seamless access to my chosen games wherever I go.

Taking the time to evaluate these key aspects will help you find the online casino that suits my precise needs and aligns with my gaming priorities. The goal is a platform you can trust to deliver security, fairness, and enjoyment every time you play.

Online Casinos with Highest RTP games

We have tested numerous online casinos and compiled a list of those offering slot games with a 97% or higher return to player (RTP). The following casinos have the most slots available with this high RTP:

Return-to-player (RTP) percentage is one of the most important factors to consider when selecting an online casino game. The RTP tells you the long-term expected rate at which wagers for a game will be paid back in winnings. Games with higher RTPs provide better returns over many bets.

Online slots are the largest category of casino games by far, offering an enormous variety of themes and special features. With slots, RTP can vary dramatically across different titles. Basic classic slots tend to have RTPs in the 85-95% range. However, some online slot variants have boosted their payout percentages up to 99% or more. Many software providers now create slots with RTPs matching other top-tier games.

When playing online slots, be sure to check for “full pay” or “high RTP” in the title. Betting maximum credits per spin also tends to increase payout rates. Though lower overall compared to other games, slots provide exciting lights, sounds, jackpots, and tremendous replay value. With the right pay table and variance tolerance, savvy slots players can optimize returns through careful title selection and bankroll management.