Book Of Clovers Slot Review
A round green door sits in a moonlit hillside, a pale path winds across the grass, and the starry sky does most of the lighting. Book Of Clovers is Spinomenal‘s Irish-luck take on the book formula, and its paytable is steeper than the gentle artwork suggests: one symbol towers over everything else, and the whole game is angled at reaching it.
It’s a familiar machine under the paint, and a roomy one. The game runs on a 5×4 grid with 10 paylines at 95.9% RTP, with a paytable that tops out at 5,000x for five Leprechauns. Players after more of the same green can try Book Of Irish Treasures or 1 Reel Shamrock from the same studio.
Base Game and Symbols
All symbols pay left to right from the leftmost reel, across the 10 fixed lines. There’s nothing unusual in how wins form: match three or more on a line, starting from reel one, and the paytable does the rest. Only the highest combination on each line counts.
The symbol set splits neatly into three tiers. The Leprechaun leads the paytable and is the only symbol that pays for a pair, with the Woman close behind and two lucky-charm symbols in the middle. The royals fill out the bottom.
- Leprechaun: 10, 100, 1,000 and 5,000 for two, three, four and five
- Woman: 5, 40, 400 and 2,000
- Pot of Gold / Horseshoe: 5, 30, 100 and 750
- A / K: three pays 5, rising to 40 and then 150 at four and five
- Q / J / 10: starts at 5 for three and climbs to 25, then 100
Those values are multiples of the line bet, so the top of the ladder is where the game’s real potential sits. A full line of Leprechauns is worth 5,000x the line bet, and it’s the prize every free spins round is quietly aiming at.
Between the premiums and the royals sits a sizeable gap. Five Leprechauns pay twenty-five times what five Pot of Golds manage, which is why the wheel choice at the start of the bonus matters as much as it does. The royals, meanwhile, are close enough to each other in value that landing any of them as the expanding symbol produces a broadly similar round.
The Book symbol does double duty as wild and scatter, counting as any symbol and paying scattered prizes on top of line wins. Three or more of it anywhere on the slot is also the route into the free spins round.
Scatter Wild and Free Spins
The Book doesn’t just trigger the feature, it pays for the privilege. Scatter prizes land in addition to any regular line wins on the same spin, so a book-heavy spin can pay twice over.
- 3 scattered Books: 2x the bet plus 10 free spins
- 4 scattered Books: 25x the bet plus the same 10
- 5 scattered Books: 250x the bet, again with 10
Every trigger awards the same 10 spins; the count of Books only changes the scatter payout. The bet per line carries over from the spin that triggered the round, so nothing is reconfigured mid-game.
The round opens with a wheel of every symbol except the Book itself. One spin of that wheel picks the expanding symbol for the whole round, which is the moment the feature is decided: land the Leprechaun on the wheel and the round has a very different ceiling to the royals.
From there it’s a straightforward loop. Each of the 10 spins resolves normally first, line wins and all, and then the expanding symbol is checked. The round ends when the spins run out unless the Books show up again.
Landing three or more Books again during the round re-triggers a further 10 free spins, with the same expanding symbol carrying over. The retrigger is where the long rounds come from, and a lucky sequence of them can keep a single bonus going well past its starting length.
The Expanding Symbol
After each free spin’s result is determined, the wheel-chosen symbol expands to fill its reels and form new paylines on top of the existing ones. The expansion only happens when it will produce a win, so it never pads a dead spin.
Two details make this version of the mechanic generous. Expanded wins are paid at full symbol value on every active line, regardless of whether the symbols sit next to each other on the reels. Those wins are then tallied separately from the original spin result, so one spin can pay its line win and then pay again on the expansion.
In practice that means a board with three or four of the chosen symbol scattered across the reels can return several wins at once, each paid at full paytable value. Combined with a retrigger, it’s the mechanic that does almost all of this game’s earning.
Bonus Buy
A buy button sits in the interface for jumping straight into the round where the feature is available. Pricing isn’t fixed here, so check the figure shown at your casino before committing.
Buying in skips the base game entirely and starts the wheel pick immediately, so the purchase buys the same round a natural trigger would give, scatter payout excepted. Where the feature is offered, the option is a straightforward shortcut rather than an enhanced version of the bonus.
Our Honest Verdict
Overall Rating: 7/10
Most of your time here is spent in the quiet meadow: steady line wins, the occasional scatter payout from the Books, and a lot of waiting for the door in the hillside to open. That round is the reason to be here at all, and it’s a good one.
The expansion paying across every line without needing consecutive symbols, and then stacking on top of the original result, is what makes a good round feel genuinely big rather than merely decent. The weakness is how narrow the path to those rounds is: the base game offers nothing beyond the Books, and a wheel pick that lands on the royals flattens the whole bonus.
This suits players who like the book formula done cleanly on ten lines, and it’s the roomier of Spinomenal’s two clover books – the Reloaded follow-up, covered here in 2026, cut both the lines and the return. Anyone wanting a second feature or a busier base game won’t find it behind this door, but what’s there is solid gold.
Book Of Clovers FAQs
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How do you trigger free spins in Book Of Clovers?
Land three or more scattered Book symbols anywhere on the slot. That awards 10 free spins plus a scatter prize of 2x, 25x or 250x the bet for three, four or five Books respectively, paid on top of any line wins. -
How does the expanding symbol work?
Before the free spins round begins, a wheel of all symbols except the Book determines the expanding symbol. After each spin’s result, that symbol expands to form new paylines, but only when the expansion creates a win. It pays across all active lines and the winning symbols don’t need to be consecutive. -
Can free spins retrigger in Book Of Clovers?
Yes. Landing three or more scattered Book symbols during the round awards an additional 10 free spins on top of whatever spins remain. -
What does the Book symbol do in Book Of Clovers?
It’s both the wild and the scatter. As a wild it counts as any symbol to complete line wins, and as a scatter three or more of it anywhere pays 2x, 25x or 250x the bet while also triggering the free spins round. -
Can you buy the bonus on Book Of Clovers?
A buy button is present in the game’s interface where the feature is offered, letting you purchase direct entry into the free spins round. Availability and pricing depend on the casino and jurisdiction. -
What is the RTP of Book Of Clovers?
The RTP is 95.9%. -
How many paylines does Book Of Clovers have?
The game has 10 fixed paylines, all paying left to right from the leftmost reel. -
What is the grid size of Book Of Clovers?
It’s a 5×4 grid: five reels and four rows, with symbols paying across the 10 fixed lines.
