Rainbow King Slot Machine

Novomatic presents a multi-coloured royalty that consists of a generous king through Rainbow King slots.

Rainbow King Slots is a 5-reel, 20 payline, online video slot game, powered by Greentube. The low variance casino game has an RTP of 95% and a Cartoon theme. Bonus features, such as Rainbow King Wilds, Cash Castle Scatters and the King Cash Bonus, could help you win up to a maximum of 12,500 coins!

Dive in to find out more through this Rainbow King Slot Review!

Best Rainbow King Slot Sites

Play the game at the best casino sites. From our research, we have created a list of the Rainbow King Slot Sites and casino sites in September 2023:

  • MrQ

    MrQ Logo

    First deposit only. Min deposit & spend £10. Max 30 spins on Big Bass Splash at 10p per spin. Spins credited upon spend of £10.

    Full T&C's Apply

  • Wizard Slots

    Wizard Slots Logo
    500 FREE SPINS

    New Players Only, Min Deposit £10, £8 Max Win Per 10 Spins, Max Bonus Conversion Equal To Lifetime Deposits (Up To £250), 65X Wagering Requirements.

    Full T&C's Apply

  • PlayOJO Casino

    Play Ojo Logo

    First deposit only. 50 Free Spins on Book of Dead slot. Free Spin valued at £0.10. OJO’s Rewards and Game Play policy applies.

    Full T&C's Apply

  • Unibet Slots

    Unibet Slots Logo
    DEPOSIT £10 GET £40

    18+ begambleaware.org. New Customers only. Minimum Deposit £10 and Get £40 in Casino Bonus Funds. Debit card only. Up to 50x wagering, game contributions vary, max. stake applies, new customers must opt in and claim offer within 24 hours and use within 30 days.

    Full T&C's Apply

  • Playzee

    Playzee Logo
    100% UP TO £300 BONUS + 100 ZEE SPINS

    18+. New players only. Min Deposit £20 Max Bonus Bet £5 Winnings from spins capped at £50 100 Zee Spins valid on Starburst (first 10 credited immediately upon first deposit; rest credited at 07:00 GMT at 10/day). Spins must be used by 23:59 GMT of the day on which they are credited to player account, any unused shall be removed. Bonus funds must be used within 30 days. Bonus funds are separate to Cash funds, and subject to 35x wagering (bonus + cash). Full terms apply. BeGambleAware.org.

    Full T&C's Apply

  • Slots Magic

    Slots Magic Logo
    UP TO £50 + 50 FREE SPINS

    First Deposit Only. Min. deposit: £10, max. Bonus £50. Game: Rich Wilde and the Book of Dead, Spin Value: £0.10, Max Extra Spins:50. WR of 30x Deposit + Bonus amount and 60x Extra Spin winnings amount (only Slots count) within 30 days. Max bet is 10% (min £0.10) of the extra spin winnings and bonus amount or £5 (lowest amount applies). Extra Spins must be used before deposited funds. Bonus Policy Applies.

    Full T&C's Apply

  • Pots of Luck

    Pots of Luck Logo
    UP TO £200

    New players only. Wagering occurs from real balance first. 50X wagering the bonus. Contribution may vary per game. Available on selected games only. The wagering requirement is calculated on bonus bets only. Bonus valid 30 days from receipt. Max conversion: 3 times the bonus amount. Withdrawal requests voids all active/pending bonuses. Excluded Skrill deposits.

    Full T&C's Apply

  • Slotzo

    Slotzo Logo
    UP TO £150 + 50 EXTRA SPINS

    18+. New Players Only. Min. deposit £20. UK players. Max. bonus 1st deposit £50 and 2nd deposit £100. Max wins from spins £100. 35x wagering applies, within 21 days. 20 spins on 1st deposit and 30 spins on 2nd deposit. Spins available on specific games. Spins expire after 24 hours.

    Full T&C's Apply

About Rainbow King Slots

Rainbow King is a video slot game from Novomatic with a theme inspired by the multi-coloured arc made by the dispersion of light in water droplets.

Rainbow King comes with five reels, three rows, and 20 paylines.

It has many impressive bonus features such as the Rainbow King feature, King Cash feature, and the Cash Castle feature.

The Rainbow King slot takes players to the kingdom of colours.

A magnificent rainbow can also be seen adorning the upper part of the game screen.

There are five vertical reels in the Rainbow King slot, displaying three symbols each.

The symbols include the card symbols designed with royal colours.

Colourful gems and sparkling crowns can also be seen filling the reels.

Slot Info

Rainbow King SlotsAttributes

Casino Game:

Rainbow King Slot Game


20 winning combinations


5 reel slots


Greentube Slots Provider

Minimum Bet:


Max Bet:



Low Variance Slots



Slot Theme: 

Cartoon Royalty

Bonus Features:

Rainbow King Wild, Cash Castle Scatter, King Cash Bonus, Autoplay Feature

Max Win:

12,500 Coins

Free Spins:


Release Date:

14th December 2011

How to Play Rainbow King Slots Online

  1. To play Rainbow King online, players must first set the number of lines to be played by clicking on the Lines button.
  2. Modify the number of coins on each line by clicking on the Bet/Line buttons.
  3. Click on the Start button to get the reels spinning.

For more details regarding the game, players can click on the More Info button.

Players can enjoy playing Rainbow King on their computer since this slot is compatible with Mac, Windows, and Linux.

The Rainbow King slot is fully optimized for mobile play on iPhones, iPads, Android phones, and tablets.

Interactive Features

The Rainbow King slot offers special features, including the following:

  • The Rainbow King Wild

This special symbol can replace other symbols in the game apart from the Rainbow King, the Castle, and the Crown icons to help players form more winning combinations.

  • The Rainbow King

This special feature can be triggered by landing at least three Rainbow King symbols.

By clicking on the Spin button, the player will then be moved around the feature board, and a die will be thrown.

Each square that the player lands will correspond to different prizes.

  • The Cash Castle

This is another special feature in the game which can be activated by landing at least three Castle symbols.

During this round, the player gets to choose a castle to reveal a prize.

  • The King Cash Feature

This round can be triggered by getting at least three Crown symbols on the second, third and fourth reels.

During this round, the player gets to select one of the twelve Crowns to reveal a prize.

  • The Rainbow King Autoplay

Players can utilize the Rainbow King slot game’s Autoplay feature to turn the reels without interruption.

What Symbol Triggers the Rainbow King Slot Bonus Free Spins?

Landing the Rainbow King square will take the player to a small slot game which he can play when his character lands on the Take the Money square.

The Free Spins will then play out.

The Rainbow King bonus feature will end when a symbol other than a seven appears.

Payline and Stakes

The Rainbow King slot offers 20 adjustable paylines.

The coin size ranges from 0.01 to 20.00.

The betting range is from 0.20 to 100 coins per spin.

The Rainbow King slot game also boasts a maximum possible payout worth a whopping 250,000 coins by waging the maximum bet on all bet lines.

Rainbow King Slot Game Software

Novomatic has the goal of providing top performing game content and an industry-leading range of proven video slot classics along with new highlights and internationally famous player favourites.

What is the Rainbow King Slot’s RTP?

The Return to Player for Rainbow King is 95%.

This payout percentage for the Rainbow King slot means that there is a theoretical return of 95 coins for a 100-coin wager.

Slot Volatility

The Rainbow King video slot game has a low variance.

This slot variance means that this slot game pays out frequently.


All in all, the expertly drawn graphics and fun animations of Rainbow King along with the helpful bonus features mentioned above make this game highly recommended to slots players.

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James has almost a decade of experience in the iGaming Industry. Winning several awards including "UK Casino Affiliate of the Year" he uses his experience to research the UK market to source the best bingo welcome bonuses, highest casino slots real money payouts and free spins sign up offers.