Book of Stars is a 5 reel, 20 payline slot powered by Novomatic. Playable from 40/50p to £16-£20 per spin across all devices including laptops, smartphones and tablets, this Greek mythology themed offering is all about the Free Games feature where you can get up to 20 free spins with a special expanding symbol.

Visually, I must say Book of Stars is 1 of Novomatic’s better efforts – with an ancient Greek feel to it with astronomers in the backdrop, it looks like something out of the Da Vinci Code. Symbols on the reels including A, K, Q, J and 10 playing cards as well as gods (Helios), goddesses (Nyx) and wise owls (Owl of Athena). There’s also an adventurous adventurer which is the highest paying symbol giving you 200 times your stake for 5 across a payline.

Book of Stars comes with an Extra Bet feature – if you activate it, your stake will increase by 25% from 40p to 50p a spin at minimum levels. More importantly, it allows for a ring wild symbol to appear on reels 2 and 4 – it also substitutes for all symbols, including the scatter, meaning it can act as a scatter which will help you trigger the Free Games feature.

To trigger the feature, you need to get 3 or more scatter/ring wild symbols anywhere on the reels – this will reward you with 10 free spins. As with other popular Novomatic slots like Book of Ra Deluxe, a symbol is randomly chosen to become the special expanding symbol.

This special expanding symbol will expand to cover the reel it’s on when forming a winning combination – if you get a few on a free spin, it can lead to huge wins. 3 or more scatters/wilds during a free spin will retrigger the feature giving you an extra 10 free spins (which takes your total to 20).

Book of Stars is typical Novomatic – highly volatile. The bigger wins will come in the Free Games feature during the special expanding symbol – especially if it’s a high value one. The difference with Book of Stars is that it looks better than most Novomatic games which is a plus.