Devil's Number by Red Tiger is a 5-reel & 4-row online slot with 30 paylines and a 96.06% RTP. Playable on all devices from €0.20 to €40 per spin, Devil's Number is a high volatility game with a max win capped at 2500x your stake.

Where to play

Check out casino bonuses on our casino index.

Design and Symbols

Red Tiger has treated us to some great design work here. The setting is a dark and spooky library with a row of books with human skulls as bookends. The floating gameboard hovers above a central aisle which bisects the library, leading down even further into the darkness. A large glowing red circle on the library floor contains the Devil's Number '666'. To the left of the gameboard is a bust of Baphomet, the image of the devil in many Tarot designs. An ominous drum led refrain loops hauntingly throughout gameplay. The comic book ‘gothic horror’ artwork is superb. I couldn't help but notice that the library scene wouldn’t look out of place in a Scooby-Doo mystery!

Low-value symbols are the standard 10-A royal card values. The high-value symbols are scrolls, spell books, boiling cauldrons, and potion bottles with skull stoppers. The highest value symbols in standard play are the potion bottles which pay 12x the total stake for 5 on a pay line. Unusually, the scatter symbol is a golden 9. Furthermore, the scatters only appear on reels 2, 3, and 4. There is no wild symbol in Devil’s Number.

Special Features


There are two random features in the base game called “Mark of the Beast” bonuses which create additional wins or chances to win once a win has landed. There is also a free spins game during which “Mark of the Beast” bonuses are also in play with slightly different functions.

Mark of the Beast Bonuses

Symbol Removal

When the Mark of the Beast randomly activates after a winning combination of lower value symbols, all symbols which form a part of that win are removed and are replaced by symbols cascading from above. This may or may not result in a further win from new combinations.

Upgrade Feature

If the Mark of the Beast burns after landing a winning combo of high-value symbols then an upgrade is applied, resulting in a bigger win. Land a winning combo of five potion bottles and the win is upgraded from 12x the stake to 22x the stake. The reason the upgrade is to a rather unusual 22.2x the stake is that the win in coins is upgraded from 360 to 666 – the Devil’s Number

Devil’s Number Free Spins

As previously noted, free spins are triggered by landing golden 9’s on reels 2, 3, and 4. The reason for the use of 9 as the scatter then becomes clear as the 9’s revolve to become three 6’s.

Three 6’s awards 12 free spins. The first win landed from any high paying symbol pays normally. Subsequent wins containing those symbols pay at an upgraded rate. After a lower value win, those symbols are removed from play for the remainder of the free spins. The cascading symbols feature comes into play after the first of any low-value symbol win during free spins.

Devil’s Number Summary

I found Devil’s Number to be a thoroughly enjoyable release from Red Tiger; a great addition to their increasingly impressive video slots library.

The game looks great, has decent-paying features, but - the 2,500x maximum win's a little low for a relatively high variance game. However, it would appear that Red Tiger was happy to trade a little of that variance to allow for better wins during standard play – and that’s no bad thing.