Online slots are fun for many reasons: the thrill of waiting for the slots reels to stop spinning, the interaction between player and machine, and (on modern video bonus titles) the video game-style play. The slots machine itself is exciting, with lights flashing, animations and video clips, and sound effects alerting you to a win. Yes, the majority of slots machine gamblers are dropping credits in hopes of winning a big slots jackpot, but gambling is designed to be entertaining.

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Free slots for fun, which don’t require any real-cash wagers and don’t pay out any winnings, have been around since the early days of home computers and video game consoles. That’s more proof that, yes, some online slots players really do enjoy spinning the reels, even when there’s no money or casino bonus on the line. Besides casinos slot games, real-money websites host free-play versions of their slots gaming software in order to show potential customers what their games are like and advertise their lineup of free slots and slot machine titles. Who wouldn’t want to play free slots for fun? Free 3-reel slots, 5-reel slots (for example, Simslots, which has both options), whatever you want. You wouldn’t find this slots option in Las Vegas, that is for sure.

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Why Play Online Slot Games for Free?

If you want the entertainment of online slots gaming without risking real money and playing free slots for fun, you’re in luck. As is the case with any type of online game of chance or skill, learning how to play a certain slot machine (and learning the machine’s bonus games, payout table, and other features) doesn’t mean you have to play for real money at an online gaming casino account. For example, a slots site like Slotomania has plenty of free slots machines, where you can figure out the bonus structures, different types of bonuses(such as a free spins bonus) and more.

Another reason to try out free online slots is the convenience factor – almost all free-to-play versions are built on a platform like Flash, meaning you don’t have to download any software to play slots. The ability to get in a few rounds of free slots for fun on your laptop without even downloading a file makes this type of gaming very convenient.

Playing online slot machines are fun, too; a slots gambler may be interested in finding free slots for fun just to pass the time. Internet betting sites that host free slot games usually also host instant-play versions of other casino games, so if you get a little bored with pulling the slots lever and watching the reels turn, you can try your hand at these free casino games for fun: blackjack, video slots, video poker, regular poker, scratch cards, or craps. However, you can’t play progressive jackpots (which are sort of similar to sweepstakes and sweepstakes rules, with the exception of being able to play slots machines for free), such as Mega Moolah, for free. Those casino games are to play for real money.

Online Slots & Computer Compatibility

These no-cost versions of Internet-based betting are compatible with many different computers, operating systems, and devices. The reason they’re so easy to match with any type of computer, be it a Mac, a PC, a tablet, a smartphone app, etc. – the lack of a download means the game’s designers don’t have to produce a different version for every different type of machine. Whether you run a Mac or a PC, instant and cost free slot machine games at online casinos are available to match. Even a slow Internet connection isn’t a big deal – these types of free casino games for fun are built on a platform simple enough that you don’t need the fastest and best hardware on the market.

This is especially true if you are trying to play free slots games with bonus rounds no download on mobile devices. In this day and age, not having to download an online casino is a huge incentive for people to start playing free slot machines. You can simply play through your internet browser, and you will be playing for free in no time, going through all the casino slots you want.

Free-Play Game Variety

The variety of free slots for fun you find at these sites is usually the same as you’d find if you did deposit a bankroll, though some sites limit their library of free to play titles, saving the full lineup of games for their paying customers. Why even host free-to-play games? Gamblers looking for a home for their online slot play usually want to check out that site’s software before they commit, and free games are the easiest way for them to do that.

The world’s best pay-to-play casino sites rotate the available free-to-play slots titles in and out to keep the lineup fresh. If a potential customer sees that one site has a larger pool of slots titles to pick from than another, he’s more likely to eventually deposit money to an account with that site, so he can play slots for real money and join the winners list.

When someone is new to online slots machines wants to practice on a variety of different online titles, or hopes to eventually play these games for real money, testing the waters and learning how different titles work, via playing free slots for fun, is a smart move. Very few online slots machines involve an element of skill or any real gambling strategy, but playing free casino slots no download is a fun diversion and can be a training aid for those who’ve never tried a specific type of slot before and are interested in learning it without spending real cash.

Spending an hour or two at a Web-based gaming site playing online slots for a dime or a quarter per spin is relatively cheap entertainment, especially if you find slots with a respectable payback percentage – but totally free slots for fun have all the entertainment value of pay-to-play titles without any deposit or financial investment at all.

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We all know that slot machines are usually the most profitable part of the casino floor. More space is dedicated to slot machine gaming than any other category of casino game, from Las Vegas to tribal casinos to Monte Carlo. The same can be said for online games. Which is why our slot guide covers both live and online slot machines.

At BestOnlineCasinos.com you will find everything from IGT and Bally slot machines to free online games and 3D slots. Our slots guide includes reviews to some of the most popular Vegas games as well as online games. We even offer 50+ games which you can play on our site for free.

If you prefer mobile, no problem! We have you covered with our mobile slots guide. This section outlines where you can play for free as well real money. The mobile section includes a dedicated page for each device, comparison reviews and more.

Though the world of slot machines is vast, it doesn’t take long to figure out how they work and how to play them. If you have any questions, feel free to send us an email or read our FAQ slot page which answers 120+ questions about slots.

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Did you know, most Vegas slot games are now available for mobile play? Our mobile guide provides information for Android, Blackberry, iPad, iPhone and Windows devices. This includes which casinos offer a mobile app for your device as well as where you can play mobile slot games for real money or free.

Part 1 - Slot Machine Odds, Wins & Payouts

Part 1 of our slot machine FAQ answers questions on slot odds, betting systems, payouts, winning and more.

Part 2 - Slot Clubs, Payback % & Hit Frequency

Part 2 of our guide covers some of the more technical questions like payback rates, hit frequency, probabilities.

Part 3 - Progressives, Jackpots & High Limit

Part 3 answers questions for high limit play, progressive jackpot odds, slot methods, tipping and more.

Part 4 - Video Slots, Games & Vegas Revenue

Part 4 covers slot revenue in Vegas, playing online slots, video slots, the RNG, weighted slots and more.

Slot Machine Software & Developers

Slot software has more variety than any other casino game online. Some casinos offer Vegas slots while others include 3D animation, spectacular graphics or cater strictly to bonus games. Our site offers software pages for all of the major brands including Bally, IGT, RTG, Betsoft, Microgaming and more. Below are the top five software platforms powering online casinos. Each page includes a list of the top five sites in addition to a complete overview of the various games on offer. You can view the most popular five software developers below or see our complete list here.

Slot machines are usually the most profitable part of the casino floor. More space is dedicated to slot machine gaming than any other category of casino game, from Las Vegas to tribal casinos to Monte Carlo. Though the world of slot machines is vast, it doesn’t take long to figure out how they work and how to play them.

Types of Slot Machines

There are a few different categories of slot machines, though a modern slot player only really needs to understand straight slots, video slots, progressive slots, and Buy a Pay slot machines.

Straight slots – These are traditional slot machine games. They don’t provide bonuses, and they pay out according to a standard pay table. Straight slots are the easiest slot machines to play. They’re excellent for beginners. If you’re just becoming familiar with the basics of slot gambling, stick with the straight slots. If you get bored or you want more action, consider moving on to video slots.

Video slots – “Video slots” are the fancier slot machines on the floor. These machines usually have larger screens to display movie-quality video and animation. These slots tend to be loud, flashy, and are usually placed in a conspicuous part of the casino floor to attract attention. Video slots tend to have licensed themes, like from movies or TV shows, and some of them are just loaded with bonus games and other features.

Progressive slots – “Progressive slots” are linked to other machines in the casino or even other slot machines at casinos around the country. The top jackpot for these machines is linked to other slots. A tiny percentage of every bet is added to a progressive jackpot total. Spin the right combination on your machine and the entire progressive jackpot is yours. Progressive slot machines tend to offer a worse payout percentage than machines that aren’t linked progressively, so it’s a bit of a risk to switch to a progressive machine and chase the jackpot.

Buy a Pay slots – Buy a Pay slots games have more than just one payout table that you can wager on, and you choose how many tables to bet per pull. Betting an extra payout table costs an extra wager for each one. Yes, it ends up costing more money to bet on Buy a Pay slots, but your chances of winning are better, too. Because different combinations pay out different amounts on each activated payout table, the number of potentially lucrative combinations goes up.

How Do Slot Machines Work?

Gone are the old electro-mechanical slot machines with static displays and heavy frames. These days, everything inside of a modern slot machine is controlled by a random number generator, a fancy device that spits out numbers all day. For example, when you pull the lever or push the spin button or in any way trigger the reels to start spinning, that random number generator comes up with a random number to assign to your spin, and that is how it is determined if you win or lose.

If you understand that today’s slot machines have a brain that runs on random numbers, you can avoid falling for inaccurate slot machine strategy advice. Anything you read online or hear from a friend that suggests that slot machines can be beaten is bunk. Each spin of the reels of a slot machine is unique from the one before it and has nothing to do with the one after it.

Tips for Playing Slot Machines

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So now that you know slot machine outcomes are based on a random chance, do you feel like there’s no way to beat them? Don’t feel that way. Lots of people win lots of money playing the slot machines at their nearby casino or online gaming site. The trick is to keep your gaming within responsible limits and have fun.