Online Slot Machines

Playing slot games is easy. All you need is a winning combination of symbols by spinning the reels. A winning combination on an active payline will pay you a win. The paytable or information of the slot game will tell you more about which is a winning symbol – some symbols are of course much more valuable than others. The first slot machine had three reels and only one payline. Three matching symbols on the payline (in the middle) brought a win.

Over time, slots have evolved to offer more paylines, more reels, free spins, auto-play features and bonus rounds. Online slots then continued to change – but for the better. 

Slot Types

There are many different types of slots that you can play at land-based casinos and online casinos. New slots keep appearing (on a weekly basis) and you should know what these slots are and which ones you like the most. Slots are very easy to play, but we aim to show you the different types of slot machines – from the classic slot machines to the modern and popular slots that are being developed nowadays.

5-reel slot

5-reel slots are just like 3-reel slots but have five reels (hence the name). These games can be harder to win than the 3-reel versions, but the potential wins are much higher. Most 5-reel slot machines also have jokers (the wild symbols) that help you create winning combinations.

Video slots

These types of slot machines are very common in online casinos these days and they are among the most popular games. These games come in a huge variety of themes and images. There is no limit in their variety. Most video slots have five reels, but there are also some with up to nine reels. The number of paylines varies, there can be up to 60 paylines, which means more winning chances. However, you have to keep in mind that it also costs more money (or coins) to play all paylines. If a video slot has 30 paylines and the coin size is 50c, you would be playing with €15 per spin. We recommend you to play with lower stakes so you can play longer.

Bonus slots

Bonus slot machines are video slots with a bonus game or feature. This is usually activated when you get 3 or more special symbols (usually bonus) on certain reels (varies from game to game). If you want to see how you trigger a bonus round, you can check that out in the slot game’s paytable. Most bonus rounds give you free spins round. The free spins usually play themselves through and then pay you your winnings at the end. We recommend you to play Jurassic Park slot because it has different bonus rounds. Also, you may like legendary Immortal Romance slot.

Progressive Jackpot Slots

The progressive jackpot slots are basically slot machines linked to a jackpot. These can be 3-reel slots, 5-reel slots, video slots, etc. and they can have bonus rounds. The jackpots on these games accumulate over time. A small part of the stakes in the game goes into the jackpot. This jackpot will then continue to grow until one lucky player hits the winning combination needed to hit that jackpot. Some jackpots are worth millions because the game is so popular. The largest online jackpot ever won was 11.7 million euros. This was won by a Norwegian player playing Mega Fortune. You can find this game at Mr Green Online Casino , for example. In order to win these huge jackpots you almost always have to play the maximum bet. If you bet half the bet you can win half the jackpot (etc.) or the odds are lower with a small bet. Normally you need five matching symbols (without the wild symbol) which is usually quite difficult to achieve. But it is generally possible.

Fruit Machines

The Fruit Machines (also often called Fruities) are a British type of slot machines . They are called Fruit Machines because the symbols are mostly fruits like cherries and melons. The slot machines are usually found in pubs, but there are plenty online as well. These fruit machines often have hold and nudge features. You might have two of the same symbols and one different. You can then hold the two symbols and spin the third one more time. With a bit of luck you get the third matching symbol and win. The nudge allows you to move the symbol up or down a line, bringing it into the payline. We recommend the Fruit Shop slot. This one is Fruity themed and extremely entertaining.

Slot Machine Terms

The classic slot machine has three reels and one payline (the line in the middle). Landing three of a kind symbols wins, with different symbols also having different prize money. Slot machines have evolved over time, offering more variations and features. The following describes all terms and expressions used in slot machines.


RTP stands for “Return to Player” and means the theoretical payout percentage of a slot in the course of its operation. For example, the Coywolf cash slot has an RTP of 96.40%. This means that for a bet of €100 you can expect a payout of €96.40 on average. The RTP value is usually between 92% and 98% and is always only an approximation in the long term, not per round.


A spin, also known as a spin, is a game round. The name goes back to the early days of slot machines when the reels were spun mechanically using a lever. This marked the beginning of a game round.


The reels are the columns or areas of the slot machine where the symbols appear. When you play the slot game (usually when you click spin) these reels will spin. Classic slot machines use three reels and modern video slots usually use five reels.


The symbols are the images that you can see on the fields of the reels. Classic slots have three symbols per reel and you can see classic symbols like cherries, sevens and melons. Newer video slots can have anything as symbols, the possibilities are endless. Most of the time, however, the theme of the slot is included in the image symbols.


This is the number of lines in a slot game. For example, you will see slots called 25 payline slots, which means they have 25 paylines. Most slots allow you to see how many paylines you can bet on. The more paylines you activate in the slot, the better your chances of winning – but it will also cost you more coins (or more money).

Scatter Symbol

Scatter symbols can be found in newer video slots and they can either multiply your win or they can trigger other features.

Wild Symbol

The wild symbols are the wild symbols of the game. This means they substitute for other symbols to create the best possible winning combination. So if you have two matching symbols and one wild symbol, the wild will act as the third matching symbol, forming a 3 symbol winning combination.

Free Spins

Most slot games also have free spins. These are usually in a bonus round and are a free bonus for the player. Some slots have more free spins than others and the value of these free spins varies from slot to slot. 


Not every slot machine has multipliers. For example, in bonus rounds players can win free spins with a multiplier. For example, if in online slot you can get a multiplier of up to 30x your winnings will be multiplied by 30 if you get a winning combination.


Some slot machines also have a progressive jackpot. When players play the slots, part of their bet goes towards the jackpot, which then steadily grows. A specific combination is required to win this jackpot. The amounts of these jackpots can vary between a few thousand and several million euros.

Progressive Jackpot

The jackpot is the maximum win, top win or simply the biggest possible win on a slot game.

This is Casino Monster list of most popular online casino slot games. Games are sorted in no particular order.