Casino.org is the go-to place for the best free slot machines and games. Here you'll find hundreds of fantastic free online slots with no download or registration needed. Our free slot games with bonus features are both Flash and HTML5 powered. So can be played on both desktop and mobile devices. All of our slots online are free to play and you can play instantly in your web browser with no deposit and no download required. Although none of our slots are real money slots. Many free online slots with bonus rounds give you a realistic feeling of exploring another world. Each spin opens up new horizons, new temptations, and new opportunities. We invite you to play free slot games with bonus rounds no download no registration.

Here you can see and play all our free slot games with bonus features, no download or no money required. Basically, any slot games with bonus features, meaning any types of bonus symbols or feature is listed on this page.

Play 30+ FREE 3-reel and 5-reel slots: Mountain Fox, Treasures of Egypt, Flaming Crates, Prosperous Fortune, Magic Wheel, Fruit Smoothie, Party Bonus, Video Poker and more! FREE Online Slot Machines! Win at least 500 credits and press the sweepstakes button to enter.

This selection of our free games online offer a wide range of different bonus games. Each makes a real difference to the games. From the simple pick an item type games commonly found in Las Vegas casinos too much more sophisticated and entertaining games. Some of the bonus games are mini-games in their own right! Some of our online slots even have skill-based bonus rounds where the player may have to use speed or accuracy to win more credits.

Free Slot Games With Bonus Features For Mobiles & Desktops

Desktop Only Slots

Our free slot games with bonus features are both Flash and HTML5 powered. So can be played on both desktop and mobile devices. All of our slots online are free to play and you can play instantly in your web browser with no deposit and no download required. Although none of our slots are real money slots, you can win real money playing our slot machines. Data charges may apply if playing on your mobile over mobile data. Therefore, it is best to make sure you are playing on a free wifi connection.

In our games, you will find a great selection of bonus features. Some of them are completely unique, to our knowledge they have never been used in an online casinos slot game. Others are the same as the features you would find in popular slots games in a casino.

Free Spins Bonus

This bonus feature is in many free casinos slots games. Both in our own games and in the slots you will find in casinos. It is pretty much what it says it is. You get a number of free spins awarded to you.
Normally to active free spins mode you have to get a specified symbol to land on the reels a certain number of times. The number of times the symbol displays on the screen at the same time normally dictates how many free spins you're awarded. For example in our Football Fever Slot, 3 stopwatch symbols or more wins you free spins. 3 wins you 3 free spins, 4 wins you 5 free spins and 5 wins you 8 free spins.
When the free spins mode is activated there is normally nothing for the player to do. They just sit back and watch as the free spins are automatically played for them.
In some free spins modes, wins can be multiplied and sometimes more free spins can be won inside the free spins mode. This is known as retriggering free spins. There are many slight variations of the free spins modes.

Pick An Item Bonus

Pick an item bonus rounds are also pretty common in our free slot games with bonus features. They are also pretty common in slots machines in casinos. You're shown a selection of images to pick from.
Depending on the game, you get to pick one or more of the items. Each item has a prize hidden in or behind them, clicking the item makes the prize credit amount to appear.
Each time you activate the pick an item round. The prizes behind each item change so they are not the same each time. Depending on the game, the items may stay in the same position or switch locations.
Many of our games have a pick an item round. Including Monopoly Slots, Girls Best Friend Slot, Cleopatra Slots, and Pirates Slots to name just a few.

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Gamble 50/50 Bonus

Another common type of bonus. The gamble round or 50/50 feature has a few variations. You can also find this bonus round in our free slot games with bonus features. The aim is to gamble the credits won by the spin that activated the bonus game. You can either keep your winnings or gamble them all for a 50/50 chance of doubling them.
In our 50/50 gamble games. There is a card face down, you have to select if it's a black or red card. You can also select which suite you think the card is. If you select correctly you double your winnings and get the chance to guess again on another card. If you guess incorrectly you lose all your winnings and return to the reels.
We have several games that feature this type of bonus feature that gets activated after every winning spin. Some of the games that have this are Flash Cash, Halloween Party, and Summer Spins

Shooting Bonus Round

Although this type of bonus round is pretty common on our site. They are not so common if at all on slots games in casinos.
We have several different types of shooting bonus games. Each requiring slightly different skill levels. Some are shooting type of games where you have to throw or shoot something at an object. Others are where you just have to click on moving items.
One of the highest skill level shooting bonus games is our Archery game in Summer Games Slot. You have to aim, judge the power of the shot. Taking into account the wind speed to try and hit the center of the target. Like reel Archery, the closer to the target you get the higher your winning credits.
Our snowball fight bonus game is unique to our Snowball slot. Once activated you get to take part in a snowball fight. You're represented by a little person with a red top, your opponents wear blue tops. You move your little person around on the screen and click on them to prepare to throw a snowball. When you let go you throw a snowball at the opponent. There are many rounds in the bonus game, each round getting progressively harder.

Racing Bonus

A race game is where you bet on the winner of a race. Like horse racing or greyhound racing. This is another unique feature that is common on our site. However, not so common in slots games at casinos. At casinos, these types of games tend to be betting games in their own right. They don't tend to be part of a slot as a bonus round.
In our Summer Games Slot, you bet on a swimmer by selecting which country you think will win the race. The position your selected swimmer finishes in determines the amount you win.
In Santa's Super Slots you bet on which toy you think will win the race. You get to place different bet amounts on different toys. When the race ends the positions that the toys come and the amount that you have bet determines the amount you win.

Fireworks Bonus

This is another game that is unique to Free Slots 4U. Our fireworks round features in Fireworks slot and New Year Party slot.
We have two versions of the Fireworks game. One version is based on the river Thames in London. While the other lets, you pick from London, New York, Paris, and Sydney. Each location features iconic landmarks as the backdrop to your fireworks display.
In the fireworks round, you get to build a fireworks display. By buying fireworks with credits from a fireworks fund. You place each firework on a timeline at the bottom of the game. When you're happy with the positioning of the rockets, simply hit Start Show. Then sit back and watch your very own fireworks display. The more fans you please with your fireworks display, the more credits you win.

Photograph the Reels

The Photograph the Reels or Shoot the Reels bonus game is pretty unique and fun type of bonus game. In this bonus game, the reels will spin up and down randomly both fast and slow. The aim is to click on a specific image as it whizzes past on the reels. The more you manage to click the more points you earn in the bonus round. This game is very much so a skill based game. It relies heavily on a keen eye and quick reaction time.
As you can see from the screenshot to the left you can play this game on our Slots of Vegas Slot. However, it is also featured in our Crazy Vegas slot. Even though all our games that have this type of bonus game each feature the word 'Vegas' in their names. This is just a coincidence. Although, we have not been to Vegas to check we are pretty sure the chances of finding this type of bonus game in Vegas is pretty slim.

Stop Flashing Light

This bonus game is similar to ones found in fruit machines. In the form of a Cash Ladder and Bonus Trail or Bonus Board. The stop the flashing light type bonus game is pretty much what it sounds like. There is a set of images that are darkened out and flash bright one at a time randomly. As they are flashing you have to click on a stop button to stop them on the correct image. Some bonus games such as the one pictured to the left show you which image you need to stop the light on. In other games, each position has a different bonus amount. Where the image you stop the light on dictates the bonus amount you win.

Our Slots of Vegas Slot slot have the type of bonus game shown in the image. Our fruit machines games have the type where the image you stop on shows the bonus you win.

Bingo Bonus

Bingo is very popular, although we don't know of any slots games at casinos that have a bingo round. So we made one! Casinos do have bingo games but they are not part of a free slot machine.
The Bingo Bonus is what it says it is. You get to play Bingo in a bonus round. This round can be found in our Bingo Slot. When playing the speed bingo round you can manually daub numbers on your bingo card, or you can select auto-daub. Look out for three bingo bonus symbols on the reels as this activates the feature in the game.
Tip: Selecting manual mode will have higher prize amounts, plus, we think, its more fun!

Video Poker Bonus

There are many video poker games in casinos. But again to our knowledge, none feature as a bonus round in a slots game.
Two of our slots, Casino Slots Slot and also Video Poker Slot feature video poker feature.
Video poker slot includes Deuces Wild Multi-Hand and Jacks or Better.
Casino Slots features Aces Faces video poker as one of its many bonus features. All the poker games are games from our Free Video Poker 4U sister site.

Roulette Bonus

Like video poker, roulette is another game that tends to be a game in its own right. So in true FreeSlots4U style, we have made it a bonus game in our slots machines.
Our Roulette Slot and Casino Slots Slot. Roulette slot features three versions of Roulette, French Roulette, American Roulette, and European Roulette. Casino Slots Slot features European Roulette.
All the Roulette games are from our sister site Roulette 4U where you can play more Roulette games.

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Blackjack Bonus

Blackjack Bonus rounds can be found in our Blackjack Slot and also our Casino Slots Slot.
The Blackjack games are from our sites site Free Blackjack 4U. where you can play more Blackjack games. Spanish Blackjack is featured in casino slots slot.
Our Blackjack Slots game features Hi Streak Blackjack, Blackjack Switch, and European Blackjack.

Spin The Wheel Bonus

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This game is very much like the Wheel of Fortune. Simply spin the wheel and watch to see where it lands to show what you've won. Our Royal Vegas Slot features this type of game.
We are continually coming up with new bonus game ideas. If you have an idea for a bonus game that you would like us to create in one of our games. Simply let us know (using our Contact Us page) and we will see what we can do!

The evolution of slot machines traces back to 1891 when Pitt and Sittman invented the poker machine made up of 5 drums and 50 cards. In 1895, Charles Fey created the first slot machine known as the Liberty Bell. The Liberty Bell slot machine featured a lever, 3 reels, and automatic payouts. The 19th century has been marked by remarkable transformations through the introduction of video slots.

Today, there is a wide range of slot machines available in the gambling market. These slot machines can be generally categorized into downloadable and instant-play slots. Downloadable free slots offer great graphics and smooth gameplay. No download casino slots are online slots which do not require players to download them to play. They rely on browser plugins hence the name “instant-play” online slots. No download slot machines are based on a Random Number Generator (RNG) system, which produces millions of possible results per second. RNG picks a single result where the slot game lands on.

How to Play Free Slot Machines

Free no download slots have their license information on the footer section of their web pages. Players need to check an online slot volatility index before they start to play slots for fun with no download or for real money. Most free online slots by RTG provider at Red Dog Casino offer a high return to player (RTP) rates to create a better gaming environment. Control buttons and special symbols are key features when gamblers play free slots without downloading.

Control Buttons

Control buttons are key features in any free slot without download. A player has to understand them before starting the game. Some of the common control buttons include:

  • Spin Button – This is the ignition key to the reels. When a player presses it, the reels will start spinning.
  • Stop Button – This control button stops spinning reels and gives the final combination of symbols on the slot machine reels. By pressing the “Stop” button, a player can win huge results.
  • Gamble Button - This control buttons offer a player a chance of increasing their winnings by placing them as a wager for the next round.
  • Bet Arrows – Players can adjust the coin size using these control buttons on free casino games online to play without downloading. Mostly, it is a combination of “+” and “-” signs.
  • Bet Per Line - For casinos that do not have fixed paylines, it is possible to adjust the number of active paylines per spin. The more line a player picks, the more chances of winning they secure.
  • Autoplay Button – This button allows a player to set the number of times the reels can spin automatically without interruption. In most free online slots with bonuses no download, you will find a preset number of rounds that you can pick from.
  • Turbo Button – Just like in motorsports, the turbo button is all about speed. This control button allows a player to spin the reels a bit faster than usual.
  • Sound Control Button – Players have different playing environment preferences; this button helps you decide whether to listen to the game soundtracks or play in a silent environment.

Special Symbols

Besides the common and basic game controls, a player must understand the special symbols in free casino games with no download needed. Special symbols enhance the gaming experience by giving players more wins and bonus round features. When two or more special symbols appear anywhere on the reels, they trigger a bonus round or scatter wins.

The wild symbols in a free online slot substitute all other symbols except the scatter symbols to form a winning combo on an active payline. It might double or triple the wins in some online slots. There are several types of wild symbols:

  • Stacked Wilds – They pill on each other to fill the reel and rewards heavily when they appear. They appear during the base game and bonus rounds.
  • Sticky Wilds – They may appear in the same positions for several spins to reward consecutive wins.
  • Expanding Wilds – They appear stretched by forming a bigger symbol which fills a whole reel and helps a player get better rewards.
  • Shifting Wilds – They are sticking between spins but keep changing their positions from the first reel up to the last reel and disappear.
  • Transferring Wilds – When they appear on the reels they replicate themselves on the adjacent reels to increase player payouts.

For example, in Dream Run slot by RTG at Red Dog Casino, 3 or more scatter Green Traffic light symbols activate the Dream Run Racing Feature. This feature takes the player into a bonus racing event where the player is only prompted to pick a car to start a race. The position of the player’s picked car determines the wins and whether they qualify for the next round. Each bonus round has different multipliers. Special symbols are behind the rapid growth of most casino games in recent years.

Types of Slot Machines

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The recent decades have recorded a massive evolution of slots from the classic 3 reel machines to the current 3D machines. Slot machine providers have embraced new technology in their sound and graphic effects as well as the general game theme. The need for a better gaming experience has driven all these changes. All these transformations have been marked by different types of slot machines. Below, you will have insights into the most common types of slot machines:

  • Classic Slot Machines

The Classic Slot machines mark one of the oldest types of slot machines in the casino industry. It features 3 reels and simple gameplay. They offer high chances of winning mega jackpots. This is the reason behind their popularity and recognition by veteran casino players. Examples of classic slot machines include Red Classic, Original Blue, and White Classic slots. Today, some of the classic slots have been improved to run on 3 or 5 reels.

  • Single-Coin Machines

Single-Coin machines are very rare today in the casino market. They have been substituted by newer slots that offer multiple coins per spin, just like wild symbols replaces other symbols in gameplay. Software developers focus more on improving the gaming environment, which has been a key determinant in the casino market. However, some casino establishments still offer Single-Coin slot machines to folks who are risk-averse.

  • Buy-Your-Pay Machines

Buy-Your-Pay slot machines are the innovation behind the Bet per Line option in the casino today. This type of slot machine allows a player to choose the number of winning combinations by the coins they insert. A single coin might only offer three bars as the online winning combination, even if more combos are available. The more the coins inserted, the more the winning combinations. Most Buy-Your-Pay Machines accept between one and five coins per spin.

  • Video Slot Machines

Video Slot machines are creations of the 19th century and later-day slot machines in the casino market. They feature 5 reels with more symbols and adjustable or fixed paylines, which create more winning combinations. They come with digital reels and spin control button to replace the old lever designs. Besides, video slot machines offer better graphics and sound effects in comparison to classic slot machines. These slot machines marked the introduction of first progressive jackpots and bonus rounds. Although video slots made a big impact on land-based casinos, they also played a major role in the prominence of casino sites online.

  • Progressive Slot Machines

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Progressive slot machines can be defined as slot machines with a jackpot that increases with every spin. They offer huge jackpots that are awarded randomly or during bonus rounds, or through a combination of matching combinations. The progressive jackpots take a small percentage of every bet and add it to the total jackpot amount until it is won. Progressive slot machines can be further subdivided into:

  • Stand-Alone Progressive slots – They are independent and offer small wins.
  • In-House Progressive slots – They are linked to other slots in the same casino and offer better winnings.
  • Wide-Area Progressive slots – This type of progressive slots are interlinked with other slots, and it offers the highest jackpots.

At Red Dog Casino players can find several progressive slot games that are combined in the game lobby into a separate category with the same name.

Types of Slot Features

A player should look for a free online slot with excellent features that pay well. Some of the slot features that you will come across as you play free online casino games for fun with no download include:

  1. Paylines – These are winning combinations that reward players. A classic slot machine has 1 to 3 paylines with video slots having up to 1024 paylines. Normally, paylines reward from the leftmost reel to the right one for any 2 or more symbols. However, multi-way slots reward in all directions.
  2. Free Spins - Players can trigger free spins by landing 3 or more scatter symbols anywhere on the reels during a base game. The number of free spins varies from one slot to another. In most cases, the number of free spins is specified in the pay tables. More reels or special symbols might be added during bonus rounds.
  3. Cascading Reels – Whenever symbols form a matching combo, they explode and move down to create a space for new symbols that drop into place and allow the player to earn more matching combos. The cascading feature continues until no more winning combos appear on the reels.

Tips for Smart Slot Play

When playing free online casino games for fun no download at Red Dog Casino, players might find this guide helpful. They will be able to know how to set a loss limit and avoid unnecessary risks. Whether a newbie, semi-pro, or veteran player, every player must develop a strategy before playing any slot game. Here are some great tips for smart slot play:

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  1. Bet the Maximum

Betting the Maximum might look a bit risky, but it is a recommended strategy. Most online slots allow players to adjust the number of active paylines per game, which in turn reduces or increases the chance to land the winning combinations. Besides, some special features such as progressive jackpots and bonus rounds are only activated if all the paylines are active. Always keep all the paylines active and enjoy more rewards than with adjusted paylines.

  1. Play Large Coin Sizes

In most free slots with no download, the return to player rates depend on the coin size or bet amount per spin. Playing for higher denominations increases the chances of landing a great winning combo. Also, high denominations have bet payouts when multipliers are applied to a winning combination.

  1. Play Demo Version

It is advisable to play a demo version of any new free online slot before betting real money. This prepares the player for any special features or symbols in advance. Also, the demo version allows a player to develop a strategy on how to stake during a base game.

  1. Avoid Tight and Complicated slots

Popular online slots have simple gameplay and better odds. It is good to avoid any new complicated online slots which are likely to offer lower odds. Some new complicated online slots might have attractive bonuses, progressive jackpots, or multipliers, but it is good to avoid them. Tight slots are frustrating and have very low returns to player rates.

Top RTG Slots to Play

RealTime Gaming (RTG) software is one of the largest gaming software providers in the casino market. It offers high-quality sound and graphics. It has more than 200 free online slots today. The top RTG slots to play at Red Dog Casino include:

  1. Megasaur
  2. Spirit of the Inca
  3. Aztec’s Millions
  4. Cleopatra’s Gold
  5. Ceasar’s Empire
  6. Cash Bandits
  7. Bubble Bubble II
  8. Fire Dragon
  9. Aladdin’s Wishes

FAQ

What are the special symbols in free casino games with no download required?

In most free online slots, wild and scatter are special symbols that trigger bonus games and great wins.

How do you differentiate legit and fake free online slots at Red Dog Casino?

License and regulatory information is normally available for players to inspect for all legit free online slots. Most game providers place it on the footer section of a casino site. Red Dog Casino obtained a license from Curaçao Gambling Authority. Moreover, all slots at Red Dog Casino are powered by RealTime Gaming, the most trustworthy gaming software provider on the market.

Why is RTG a preferred brand among free online slot players?

RealTime Gaming offers quality graphics and easy-to-navigate user interfaces for the players to enjoy a relaxed gaming environment. Since 1998, RTG has been offerings slots with a high RTP rate.

Where can I play RTG games?

Many casino sites offer RTG free online slots, but we recommend Red Dog Casino since it is secure and has a wide range of online slots.