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This is one of Astra's most popular games in the entire UK market.

And for those of you that didn't know, Astra is a sub brand to Novomatic. The Rainbow King is hosted by their online division Greentube.

It's pretty similar to Barcrest's Rainbow Riches, an immensly popular slot in the UK.

Where to play Rainbow King slots

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Why so many rainbow slots? one might wonder.

Well, the rainbow takes a special place in many myths and religions all over the worlds. During antiquity, it was often considered as a bridge between our world and the worlds of the Gods. Some countries - like Ireland - had traditions that associated the rainbow with riches. On the green isle one thought that the leprechaun hides a pot full of gold at the and of the rainbow. A similar myth exists in some African cultures, where the treasure is gem stones instead of gold.

Legends like these are powerful, and Novomatic know how to make best use of it. A rainbow will virtually always bring positive feelings to most persons, and the prospect of finding gold at the end of the rainbow doesn't exactly mismatch with the reasons we start spinning the reels on slot machines in the first hand.

In this slot, you will meet a King of Rainbow. He rules the castle that is always below the rainbow, and he owns countless of treasures. A part of these riches can become yours, should the fortune smile on you when you play the no deposit Rainbow King slots.

General description

The Rainbow King is an online video slot with 5 reels, 20 paylines, and 3 rows. It is packed with a wide range of gaming functions, and while playing Rainbow King slots, you can stake anywhere from 2 to 500 credits per payline. It means that the maximum bet per spin is 10 000 credits.

There are several different bonus rounds and special symbols with advanced options. What we don't see is the gambling feature that is so common for Novomatic slots (think: Book of Ra, Faust and Lucky Lady's Charm, for instance).

You win by lining up symbols from left to right, as always. No fancy 243-ways win like in Game of Thrones slots, or exotic reel designs like in Dazzle Me.

5000x the bet per line is your potential max winnings. But unfortunately we haven't been able to find any theoretical RTP for the no deposit Rainbow King video slot. It's always good to know the RTP before you start playing, that way you know how much the machine will pay back to players and how much the casino will keep.


You will find standard symbols among Rainbow King's lower value icons, the classical 10, J, Q, K and A.

But there are not many standard icons among the higher value symbols. Here you will find a pot of gold, the wild, a Rainbow King, a golden crown and the Rainbow King's castle.

The wilds will help you form combinations, as always, and replace all other symbols except bonus related ones.

Bonus games

There are three different bonus games in Rainbow King – each is triggered by getting at least three of the same bonus symbol on the reels. Since there are three bonus modes, there are also three bonus symbols:

  • The Rainbow King Symbol
  • The Castle Symbol
  • The Crown Symbol

There are no chances of landing an impressive jackpot in this game, none whatsoever. 500 coins is the maximum you can win. But Rainbow King more than compensates for this shortcoming by having the 3 different bonus modes.

The first one is the Rainbow King Bonus Feature. This one is triggered whenever you land 3 or more King symbols on the reels. When that happens you have to push the Spin button, which will allow you to move around the board by throwing a dice, much like in any board game. Each square you stop on have a different prize. You get to play until you land on a "Take the Money" square. 

The second one is the Cash Castle Bonus Feature. By getting 3 or more castle symboles you will trigger this bonus game. It is a classic "Pick Me" feature where you choose one castle. The prizes varies between 2x and 500x your bet.

The third is the King Cash Bonus Feature. If you manage to get 3 crown symbols on reels 2, 3 and 4, you will get to another "Pick me" feature. In this case, you will select 1 out of 12 crowns to reveal your prize. This is a more lucrative bonus mode than the Cash Castle Feature, and you will win anywhere between 50x and 500x your bet.

Jackpots and payouts

Don't expect to be able to buy a new yacht or a Lamborghini by winning on Rainbow King slots. There is no progressive jackpot available. The maximal win is 500x your bet. Much like most UK faced slot machines with a maximal win of 500x, Rainbow King have a theoretical RTP of 95%.

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Astra and Greentube have translations to many languages of the interface, so you just have to choose the right casino if you want to play on another language than English.

It's a very neat interface where everything is so intuitive that there's not even any point in explaining how to use it. Just try the game and you will get it from the moment it starts.

This slot is available in flash mode, which means that you don't have to download it. Instead, it can be played in any Flash enabled browser.


The Novomatic Company sure knows how to produce great video slots. No deposit Rainbow King slots is interesting primarily for its varied bonus features. The cute graphics and a multi-language interface is are also on the plus side.

One downside is the payoffs. You can not get millions in cash, no matter which symbols you combine. But on the other hand, you can expect to get a winning in almost every spin, so there's a lot of action waiting for you.

With a theoretical RTP of 95% and a maximum win of up to £250,000 this is a decent slot. We found the features quite hard to trigger, but once we did, the rewards were definitely worth the waiting period.

Being a land-based classic, veteran casino players will surely recognize this game and get a nostalgia trip just by hearing the sounds. And if you come to like Rainbow King, we can strongly recommend other Novomatic slots, Book of Ra in particular.

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