Slots: Rules on how to play, winning tips & strategy guides


It's assumed that the first mechanical slot machine was invented by Charles Fey, in San Francisco, 1887. It included three spinning reels with five symbols. The game was simple, easy to use and gave the chance to win a great deal of money. Due to these factors, it quickly gained immense popularity in the USA.

Over the next few decades, several other types of slot machines were invented. These included different numbers of reels, to several types of symbols. They all offered thrilling excitement for a low amount of money invested.

The first electromechanical slot machine was created in 1963. Its immense popularity determined other game operators also to switch to a similar system. This set the basis for future developments in the gambling industry.

Slots at Online Casinos

Today it's also possible to play slots on the internet at so-called online casino sites. Most countries around the globe have legalized online gaming and are offering licenses to online casinos that guarantee player safety and only offer reliable services. In exchange for a license, these online casinos pay taxes to the state.

Online slot games work exactly the same as slots in land-based casinos. In fact, most slot games in land-based casinos are technically speaking online slots themselves because the slot machines employed in land-based casinos don't use mechanical parts anymore. They use a gaming software, much like slot games in an online casino.

Switching from mechanical parts to casino software allows for greater customization and the development of more features. While most traditional slot machines were only able to contain around three to five reels due to technical limitations, the number of reels and symbol combinations offered by online slot games has in theory no limits.

Casino software also allows casinos the possibility to develop cutting-edge graphics and even add distinct story-lines to their slot games. The latest trends in the online gaming world are so-called themed slot games that unfold a distinct and exiting story-line as the game progresses.

3D Video Slots

The next level in the development of online slots is 3D slots. 3D slots are technically normal video slot games only that the graphics employed in them are of the same quality as graphics used in actual video games such as RPG's and even first person shooters.

Most of the time, these games contain a story-line as well that will unfold as the game progresses. Like actual PC video games, they usually contain levels, scenarios and maps that will be unlocked after the player meets certain criteria that will clear the previous level.

Slots Winning Probabilities

The first thing to remember when playing slots either offline or online is that it's a game of pure chance and luck. There are no ways to beat the system or the casino, no matter how hard one would try. Another thing that's important to remember is that the chances for a player to lose are always much higher than the chances for that player to win.

This however does not mean that players are not possible to win large prizes. Very large prizes are paid out on a frequent basis by casinos to their players, it's that overall, over a long period of time and after many games played, there will be more losing players than winning players.

The sum total of all money lost by players and won by players is always in the favor of the casino. But again, individual players may very well win large amounts of money. This happens very frequently at every legitimate online and land-based casino.

Online Slots Progressive Jackpots

The highlights of online and land-based casino slots are the jackpots. It's every slots player's dream to hit a huge jackpot worth multiple millions of dollars. Naturally the odds of hitting such as jackpot are extremely small but at some point every single online casino jackpot will be hit.

To understand why at some point each jackpot will be hit one has to understand the way online slots jackpots are created. Slots jackpots aren't provided from the casinos own money, they are built up by players themselves. Each time a player bets on a spin on a jackpot slot machine a certain part of that bet will be added to the jackpot prize pool.

Considering this, it's not strange that a casino is willing to pay out multiple millions of dollars in jackpots. It's not its own money that's at stake, it's money that has been deposited by players themselves. And at some point each jackpot will be hit by a player. These are the rules. The casino is not allowed to keep the jackpot money to itself.

Play Slots from Your Mobile Device

Nowadays it's also possible to play slots on mobile devices such as smartphones and tablets. Modern smartphones and tables perform the same way as a normal personal computer would do: they are capable of generating high-definition graphics and run demanding software applications.

Casino games offered by traditional online casinos can also be run on modern mobile devices. In most cases an online casino will provide an app that can be downloaded and installed by players. The app will allow players to access the offered casino games from their mobile devices.

The huge advantage of mobile slots gameplay is obviously the fact that players are able to access them from virtually every location and in any situation imaginable. These days online slots aren't confined to living rooms; players have the possibility to play slots online anytime and anywhere.

Best Online Slots Sites


Euro Grand

9.9 Read review
  • Several hundred slot games available
  • Progressive slots with prizes above millions of dollars
  • Vivid animations and theme related sound effects

William Hill Casino

9.8 Read review

9.7 Read review

Winner Casino

9.5 Read review

Slots news

Michael Mills

Microgaming to Release Two New HD Slot Games in November

September 22nd

Online gambling technology and game developer Microgaming revealed that it would be launching two new HD video slot games in November this year. The new games will be called Lucky Twins and Basketball Star.

Michael Mills to Offer Casino Games Developed by Net Entertainment

April 17th

Popular gambling company revealed that it would from now on offer casino games developed by renowned Swedish game developer Net Entertainment.

Michael Mills

Norwegian Online Casino Player Wins €3 Million Slots Jackpot

March 19th

A lucky Norwegian online casino players managed last week to win a massive sum of €3,056,545 by hitting the popular slots jackpot Mega Fortune run by casino tech company Net Entertainment.

Michael Mills

Microgaming Launches Five New Online Slots Games

January 9th

Online casino technology and game developer Microgaming announced that it had launched five new online casino games that will be available at all Microgaming-powered online casinos.

Michael Mills

Net Entertainment and William Hill Sign Content Partnership Deal

June 26th, 2014

Swedish gambling content provider Net Entertainment revealed that it entered into a major partnership with UK based gambling operator William Hill regarding the provision of online casino games.

Michael Mills

Delaware Online Gambling Market Shows Signs of Growth

March 16th, 2014

Delaware online gambling regulators revealed that in February 2014 the state's legal online gambling market grew with an important 13%. Nevertheless, the state's online gambling market is still very far away from being competitive.