Book Of Helios

Book Of Helios Slot Review

Two cracked stone horses rear at the edges of the screen, red eyes glowing, while a helmeted giant glares over the reels and a golden sunburst burns through the arch behind him. Betsoft have built a temple worth guarding, and the game inside it argues for something most Book slots don’t bother with: a wild that keeps working after the bonus opens, expanding into multiplier reels instead of standing aside for the chosen symbol. Book Of Helios runs on a 5×3 grid with 10 fixed paylines, a 95.58% RTP and high volatility.

It’s a formula the studio knows well, sitting in their catalogue alongside Golden Dragon Inferno, Thunder Clash and Rise Of Triton. What separates this one from the standard Book pack is what the books do once the bonus is running.

Symbols and Paytable

Wins pay left to right across the 10 fixed lines, with only the highest combination on each line counting and coinciding wins on different lines added together. Payouts scale with the chosen bet. The Book itself does double duty: it’s the wild, substituting for any other symbol, and it’s also the scatter that unlocks the bonus, though it carries no payout of its own.

The higher symbols pay from just two on a line; the royals need three. All values below are multiples of the total bet:

• Helios medallion: 2x for two, 5x for three, 10x for four, 20x for five
• Woman archer: 1x for two, 3x for three, 8x for four, 15x for five
• Crossbow: 0.5x for two, 2x for three, 5x for four, 10x for five
• Whip: 0.5x for two, 2x for three, 5x for four, 10x for five
• A: 1x for three, 3x for four, 8x for five
• K: 0.5x for three, 2x for four, 6x for five
• Q: 0.5x for three, 2x for four, 6x for five
• J: 0.2x for three, 1x for four, 5x for five
• 10: 0.2x for three, 1x for four, 5x for five

Those multiples are of the total bet, not the line bet, which is worth pausing on. With 10 lines in play, a five-symbol combination returns the listed multiple of the whole stake rather than a tenth of it, so the figures above are exactly what each combination puts back relative to what’s wagered.

The split matters more than it looks. Because the medallion, archer, crossbow and whip all pay from two appearances, any of them can become a dangerous special symbol in the bonus round, where two reels of the chosen symbol are enough to trigger the expansions. A royal as the pick needs three reels instead.

Free Spins and Expanding Symbols

Landing three Book symbols on reels 2, 3 and 4 awards 10 free spins. There’s no instant scatter payout; the books exist purely to open the feature. Free spins play at the bet of the triggering spin.

Before the round begins, one paying symbol is chosen at random to become the special expanding symbol. After regular wins are paid, if the chosen symbol appears on enough reels to form a win by its own paytable, every instance expands to cover its full reel. Expanded symbols pay like the regular symbol, but on non-adjacent positions and across all lines played.

The books join in. Any Book symbols on the reels at the same time also expand to fill their reel, and each expanded Book reveals a win multiplier of 1x, 2x, 3x, 4x or 5x, applied per expanded reel rather than per symbol. The expanded books substitute for the special expanding symbol, multipliers included.

The essentials of the round, in order:

• Trigger: three Book scatters on reels 2, 3 and 4
• Award: 10 free spins, played at the triggering bet
• One paying symbol is randomly selected as the special expanding symbol
• Expanded symbols pay on non-adjacent positions and all lines played
• Expanded Book wilds reveal a 1x to 5x multiplier each and substitute for the expanding symbol
• Retrigger: not available, the round always runs for exactly 10 spins

That stacking is where the round’s potential lives. When expanded wild reels and expanded symbol reels share the grid, any win formed from that combination takes every revealed multiplier into account, and the multipliers multiply rather than add. Three expanded wild reels all showing 5x multiply any win from that combination by 125x.

Two edge rules complete the picture. If only wild reels expand and no special symbol reels appear, a possible win of the special expanding symbol across the 10 paylines still counts. Where a Book and the special symbol share a reel, the Book takes priority for expansion. There’s no maximum win figure for this one, so the ceiling is simply whatever the expansions and multipliers can assemble.

One restriction shapes every session: additional free spins cannot be earned during free spins mode. 10 spins is the lot, so a round lives or dies on what lands within them.

Buy Feature

For players who’d rather not wait, the Buy Feature skips straight to the round. A dedicated button on the base game screen opens the purchase panel. What it buys and what it costs:

• What it buys: 10 free spins, identical to a naturally triggered round
• Cost: 32.75 at the game’s 0.50 base bet

The bought round plays out exactly as if it had been triggered, random expanding symbol and all. The value of any given purchase rests entirely on which symbol gets picked and whether the books land together, and 10 spins without a retrigger leaves no room for a slow start to recover.

Our Honest Verdict

Overall Rating: 7.1/10

You spend most of a session in Helios’s temple waiting for the books to arrive, and the temple is good enough company that the wait rarely stings. Stone horses with glowing eyes, a sun god leaning over the frame: the artwork does real work here, and it’s the reason to pick this over any other Book slot on the shelf.

The bonus is the sharpest version of the formula this studio has shipped, because the expanding wild multipliers give a round genuine stacking potential instead of one flat expansion. The weakness sits right beside it: 10 spins and no retrigger means a round that starts badly has no way back, and the base game between rounds is thin.

This one suits Book-slot players who want the familiar engine with a bigger upside, and it will lose anyone who needs a base game with more going on. When the sun finally breaks through that arch, it’s worth having been in the room.

Book Of Helios FAQs

• What is the RTP of Book Of Helios?

  Book Of Helios runs at an RTP of 95.58%, paired with high volatility.
• Is Book Of Helios high volatility?

  Yes, it’s a high volatility slot, so wins tend to be less frequent but potentially larger when they land.
• How many paylines does Book Of Helios have?

  It’s a 5-reel, 3-row slot with 10 fixed paylines, paying left to right.
• Can you buy the bonus on Book Of Helios?

  Yes. The Buy Feature costs 32.75 at the game’s 0.50 base bet and buys straight into the free spins round with 10 spins.
• What does the Book symbol do in Book Of Helios?

  The Book is both the wild and the scatter. As a wild it substitutes for any other symbol, and three of them on reels 2, 3 and 4 trigger the free spins. During free spins, Book symbols expand to cover their reel and reveal a 1x to 5x win multiplier.
• How does the special expanding symbol work?

  Before free spins begin, one paying symbol is chosen at random. If it appears on two or more reels (or three or more, depending on its paytable) and can form a win, each instance expands to cover its entire reel, paying on non-adjacent positions and on all lines played.
• Can free spins be retriggered in Book Of Helios?

  No. Additional free spins cannot be earned during free spins mode, so the round always runs for exactly 10 spins.
• When is Book Of Helios released?

  Book Of Helios’s release date is 16 June 2022.