Feature drop = instant free spins! Online slots to buy bonus round!

Feature drop = instant free spins! Online slots to buy bonus round!

Sometimes it just takes an eternity to enter free spin feature while playing casino slots. Find out about games where you can buy a bonus round – Feature Drop! Awesome addition to casino games introduced by Big Time Gaming and accepted by many software developers. 

The concept is very simple. Choose one of the games with feature drop and use it. It will transfer you to the bonus round of a particular game at the cost of some coins. We find this feature very useful, especially for people with limited play time. For all of you that are in a constant hurry or lack a bit of patience, we underlined some of our favorite slots with ‘buy free spins’ option.

Is it worth it?

Probably not. What you get is a pricey option, nicely presented but with low chance to win. Based on our experience, it will take several purchases in a row until you actually get something back from these bonus rounds. Giving the fact that they are not cheap, you better not spam them in real money play. Then again if you can afford to buy many bonus rounds in a row at the cost of 44x your stake and more, go for it.

Here below you can see our list of ‘Feature drop’ casino games. To make it more simple because many of them are ‘Megaways’ which means that these types of slots don’t have an equal number of paylines every subsequent spin, we calculated the price of bonus feature on €1 overall bet.  One thing is constant here; you will win fast or lose your money even faster. Test them yourself for free on our site by clicking on the slot images.

Dragon Kings – BetSoft

With Chinese theme and 4 in game jackpots, Dragon Kings come with the cheapest feature drop on our list with a good reason. You will need €44 on a €1 bet to enter 30 free spins. It will give you a lot of very low wins, while bigger gains come with extreme volatility.

Machina Megaways – Kalamba Gaming

This one uses a modern futuristic theme and offers you 4 different types of instant free spins. 18 of them are the most expensive and cost around €337,1 on €1 overall stake. This is a very expensive feature because the symbol value is low. We like the design and that is the main reason why is Machina Megaways on our list.

Book of Gods – Big Time Gaming

You will need €80 on €1 bet to instantly enter free spins part of the game. It is somewhat high for medium-high variance slot but you should keep one thing in mind. There is a chance to regain free spins with up to 4 special expanding symbols. It can be worth every cent you invest in.

Legacy of Ra – BluePrint Gaming

At the cost of €100 on a €1 bet, you enter Ancient Egyptian Tombs in a search for invaluable treasures. It looks very promising and tempting. This is one of our favorite slot games when you play it normal way. The problem with instant free spins so-called ‘Ra bonus’ is that you get low value symbols as cloning sign almost every time.

Extra Chilli – Big Time Gaming

Extra Chilli is one of the most if not the most played Megaways slot games from BTG. It offers a very reasonable ‘Feature drop’ option for €50 on a €1 overall stake. It also gives you the option to gamble on the number of free spins. Gamble option is very risky because you can lose them all if you fail.

Book of Cleopatra – Stake Logic

This slot uses the classic ‘Book’ pattern as a slot with a special expanding symbol. We all know how it goes when you play extremely volatile games. That’s why you must pay €160 on €1 bet to enter Cleopatra’s chambers. This is a slot to claim ‘trigger feature’ in real money adventures. Sometimes it pays off big time.

Sweet Bonanza – Pragmatic Play

And the winner is? Well, the reason why is a personal experience. We had by far the best results while buying instant bonus free spin feature with Sweet Bonanza. You need €100 investment to enter the bonus round on a €1 stake. Giving the fact there is 100x multiplier symbol in this slot… well you get the point. The game has medium-high variance.

Starburst (NetEnt) or Crystal Sun (Play’n Go), the question is now?

Starburst (NetEnt) or Crystal Sun (Play’n Go), the question is now?

A comparison between Starburst by NetEnt and Crystal Sun by Play’n Go, 2 very similar slots with space thematics and respin feature. Which one is better?

Every now and then we are witnessing attempts to borrow some of the main game features to create something new, possibly improved version of an existing product. Lately, we were very curious about the new casino slot release by Play’n Go. Crystal Sun is a game that has a very similar core design to Starburst with several additional features. Both games use deep space theme and nice 3d design. It is up to personal preference which one looks nicer.

We tested both games throughout in order to summarize our experience and present it to any potential player that wants to try them out. So which one is better in real money play?

RTP: 96 %

VARIANCE: Medium – Low



RTP: 96.15 %




Different Playstyles

As you can see above the text there is a nice chunk of the difference between these games. For more experienced players the conclusion will ring the bell immediately. For those who are yet to obtain practice in slot machines, here are our thoughts on the subject.

Starburst and Crystal Sun are both playable slots for real money. What differentiates them is the playstyle. Although NetEnt and Play’n Go slot games both have respin feature, similar theme and sounds, your approach to them should be very different. So here is what we mean:


This is one of the most played slots in the world and if you came here you probably have played it. There is a good reason why is this slot machine almost exclusively represented as a Free Spins bonus offer at so many online casinos. That is because you can not win while playing this game on low bets per spin. Feel free to test it out on our website for free. Starburst is designed to be played on very high bets for short periods of time. And whenever you manage to triple or quadruple your money, just stop and move on. The game is simply not made for minimum bets because even if you do hit big wins, they are not that big to make you content with the session.

Crystal Sun:

This one, on the other hand, is made for long sessions with an overall stake as high as your bankroll allows you to spin. But you must play a lot of spins before you hit 4 000x your stake with multipliers. So approach to the game as with any other high variance slot machine. And that is where we find the biggest problem with Crystal Sun. It is much more entertaining to play some of the ‘special expanding symbol’ slots with similar RTP and volatility but with bonus rounds.


Starburst is a fast-paced game that will make you feel like on a rollercoaster. Our advice is to stop as soon as you reach heights. Crystal Sun is a slow-paced game that will constantly dry out your balance before you hit the huge win in one respin mode. Both of them will be played a lot in the future but for different reasons.

Some of the popular NetEnt and Play’n Go casinos

Here below you can claim welcome bonus packages at some of the most known online casinos that offer you to play Starburst and Crystal Sun slot machines. A simple click on the image will take you directly to the casino lobby.

Playamo Casino

Take Welcome Bonus

100% up to 100€

Mr. Green Casino

Take Welcome Bonus

100% up to 100€

A collection of the best slot games with Book as Scatter symbol!

A collection of the best slot games with Book as Scatter symbol!

All them top slot machines that use Book as Wild or Scatter symbol and take you to the special feature with expanding or cloning signs on the reels.

All the wisdom is already written and stored on the shelves in the libraries. Well, almost all of it. Some of the knowledge is yet to be revealed. You guessed it right. Three or more Book symbols won while playing casino slot machines will open up new corridors where one can gain nice amounts of knowledge. Measured in coins.

The best part is in the words once spoken by Stephen King: ‘Books are a uniquely portable magic.’ You can play these games on your Desktop, Tablet and Mobile devices whenever or wherever you want for free on our site or for real money in the reputable casinos. 

So this is our top list:

Book of Sun – Booongo studios

Ancient Egypt is well known as a civilization that worshiped the Sun. In this game designed by Booonogo Studios, you are aiming for 3 or more Scatter Signs to enter bonus feature with 12 free spins that can be regained an unlimited number of times. Golden Pharaoh Statue is that symbol that brings 500 x your stake during the basic game and 5 000 your overall bet during free spins.

Book of Adventure – Stake Logic

Stake Logic’s adventure uses a well known pattern that proved to deliver time and time again. In this game, you aim for 3 or more Book symbols that take you to the 10 free spins with randomly given cloning symbol. If you see a Tomb Raider with a hat in a slot game, you know he is the one who brings 5 000 x your stake during bonus feature in just one spin.

Book of Gold – Playson

Playson software makers took famous gameplay and revamped it a little bit by lowering variance of the game. Book of Gold Double Chance is the only medium volatility slot on our list. You win more often but the wins are lower compared to other Book slots. Golden Pharaoh is the most rewarding sign in this search for gold alongside the Nile river.

Book of Ra Deluxe – Novomatic

The first upgrade of an unparallel Novoline slot machine that introduced 10 winning lines in a game with special expanding symbol during free spins feature. The most played slot of all times with an incredible big win of 250 000 € in a single spin when playing on a 50€ bet. This is where the story began more than a decade ago and many followed the model with their own twist with the unique gameplay.

Book of Oz – Microgaming

Not only that Triple Edge Studios changed the Theme and moved from Pharaoh’s world to Emerald City fantasy, but they also enhanced game features in their Book of Oz game. In this slot, you are able to manually spin individual reel after a regular spin in case there is a chance to win third Book Scatter or a big payline win. The wizard with the green hat is the most valuable symbol.

Book of Dead – Play’n Go

On our way back to Egyptian mysteries and hidden treasures it is hard not to mention Play’n Go slot game with Rich Wild as Egyptologist. One of the most played and represented games in the world is also the best Book of Ra alternative by all means. Not only that you get a similar feeling while you play Book of Dead but your chances to win are actually higher. The reason why is 96,4% RTP (return to player). More than 1% compared to Novoline’s online game.

Book of Gods – Big Time Gaming

This slot game hit the big time! Nicely designed fantasy Gods from Ancient times with 3 remarkable key features makes you engaged all the time when you play it. There is symbol cloning during regular play when randomly selected sign expands to the rest of the reels. At least 3 or more Book Scatters will transfer you to the 10 free spins feature that can be retriggered. If you manage to do that you will be awarded one more special expanding symbol. It can go up to 4 times until all Gods are represented. The third and most appealing feature is ‘Feature Drop‘. What you do here is buy free spins feature for the price of 80x your overall stake. Cool thing if you wanna speed things up a bit.

Book of Cleopatra – Stake Logic

Beautifully designed game with Cleopatra as the main symbol with the addition of great Oriental sounds that will make you fall into the story 100%. Just don’t get overwhelmed by ‘buy bonus round’ feature to many times in a row. Instant free spins cost an 80x overall stake.

Book of Ra Magic – Novomatic and Novoline.

From the moment when Greentube launched this game online, it became our favorite slot game. Novoline increased the volatility of this sequel but the RTP is still equal to the Deluxe version, just a little bit above 95%. The biggest change is in the free spins. Every time you regain 3 Book symbols during free spins you are given 1 more special expanding (cloning) sign. You can win up to 9 cloning symbols on your lucky day. This moment comes with a very high variance but when you actually start to stack cloning signs you witness unmatched excitement in Book of Ra Magic game compared to any other Book slot machine.