Last updated: May 2026. Expanding-symbol behaviour documented from 12+ bonus rounds triggered across our 300-spin test set, plus replays from public big-win compilations.
The expanding-symbol feature is the part of Legacy of Dead — and the entire Book-of-Dead family — that makes the bonus round dramatic. It's not the wild substitution. It's not the gamble feature. It's the moment after the third scatter lands when the screen darkens, the parchment unfurls, and the game randomly selects one symbol from the paytable to expand across full reels for the rest of the free-spin round. That single random choice determines whether your round is a 5,000× life-changer or a 20× polite consolation. This article unpacks exactly how the expansion mechanic works, what makes it different from a sticky-wild bonus, and why getting Rich Wilde as your selected symbol is the dream outcome.
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What the expanding-symbol feature actually does
When you trigger free spins (3+ wild-scatters), before the first free spin actually fires, the game shows you a brief animation: an Egyptian hieroglyph parchment unfurls, the available paying symbols cycle past, and one symbol locks in as the selected expanding symbol for the round.
For the next 10 free spins (plus any retrigger spins), whenever that selected symbol lands on a payline in any position, it expands to fill all three rows of that entire reel. The expanded symbol is then evaluated against the 10 paylines as if it had landed on every row of that reel simultaneously.
The expansion happens before line evaluation — so a single expanding symbol landing on reel 3 effectively becomes three symbols (one on each row), each contributing to whatever paylines pass through reel 3.
The randomness of symbol selection
The selected expanding symbol is drawn at random from the paying-symbol pool when free spins are awarded. In our test set the rough distribution looked like this:
| Symbol selected | Frequency in our test | Round payout shape |
|---|---|---|
| Rich Wilde | ~12% | Highest ceiling — 100-5,000× possible |
| Pharaoh | ~13% | High ceiling — 60-2,000× possible |
| Anubis / Bastet | ~22% (combined) | Mid-tier — 30-500× typical |
| Scarab | ~13% | Mid-tier — 30-400× typical |
| Ace | ~10% | Modest — 10-100× typical |
| King | ~10% | Modest — 5-80× typical |
| Queen | ~8% | Modest — 5-80× typical |
| Jack | ~6% | Low — 3-40× typical |
| Ten | ~6% | Low — 3-40× typical |
The pattern: roughly half the bonuses select a high-pay (Wilde/Pharaoh/Anubis/Bastet/Scarab), roughly half select a low-pay (10/J/Q/K/A). The variance between rounds is the entire game. Pair this with the full paytable in the specs sheet to see how each symbol's 5-of-a-kind multiplier feeds into round potential.
The selection is not influenced by your bet size, your account history, or anything you can control. It's pure RNG, drawn fresh per bonus.
How the expansion math works
Consider a single free spin where the selected symbol is Rich Wilde:
Without expansion:
- Wilde lands on reel 3, row 2 only.
- Paylines through reel 3 row 2 evaluate normally.
- If reels 1 and 2 also show Wilde (or wilds), one or two paylines complete.
With expansion:
- Wilde lands on reel 3, row 2.
- Wilde expands to fill reel 3 entirely (rows 1, 2, and 3).
- All 10 paylines now check reel 3 — every line passing through reel 3 finds a Wilde.
- If reels 1 and 2 also contain Wilde or wilds across multiple rows, multiple paylines complete simultaneously.
The compound effect on a multi-reel landing is the source of the big wins. If Wilde lands on reels 2, 3, and 4 in the same spin, all three reels expand, and the grid effectively becomes "Wilde across columns 2-4". If the wild also lands on reel 1 or reel 5, you can clear 5-of-a-kind hits on all 10 paylines simultaneously — and the 5-of-a-kind Wilde pays 500× per line. Ten lines × 500× line bet = 5,000× total bet on that single spin.
This is the math path to max win, and it's the only one.
Expansion + wild substitution
The wild-scatter symbol (the ankh-and-book) also acts as a wild during free spins. So if the expanding symbol is Rich Wilde, and Wilde lands on reels 2 and 4, and the wild-scatter lands on reel 3 — the wild substitutes for Wilde on reel 3 (and also expands? No — only the selected expanding symbol expands, the wild-scatter still acts as a normal wild and substitutes but doesn't expand).
This is one of the subtleties that confuses new players. The wild-scatter is always a wild but it's never the expanding symbol. The expanding symbol is selected from the paying symbols (the 10 non-special tiles).
Why low-pay rounds happen so often
The expanding-symbol pool is all 10 paying symbols, drawn at random. Half of them are low-pays (10, J, Q, K, A). So roughly half your bonus rounds will be seeded with a card-rank as the expanding symbol.
This feels unfair when it happens to you four times in a row — but it's just probability. Card-rank bonus rounds typically pay 5-50× stake; you get your trigger payout and a modest bonus and move on. They're not "failed" rounds, they're "expected" rounds.
The dream rounds — Wilde-seeded with retriggers — are roughly 1 in 8 bonuses. Plan around the average shape, not the dream shape.
The retrigger mechanic
During free spins, if 3+ wild-scatters land again, you get +10 additional free spins. The same expanding symbol carries through the retrigger — so if you triggered on Wilde and retriggered three times, you'd play 40 free spins all with Wilde as the expanding symbol.
Retriggers occurred in roughly 15-17% of bonus rounds in our test set. Multi-retrigger rounds (2+ retriggers in the same bonus) occurred in roughly 3%.
A multi-retrigger Wilde-seeded round is the most common path to max-win territory. It gives the random expansions enough chances to land on multiple reels simultaneously with wild substitutions filling the gaps. The free spins trigger and strategy article covers retrigger probabilities in more detail.
The visual choreography
What makes the expansion feature genuinely thrilling is the audio-visual build:
- Symbol-selection animation: parchment unfurls, hieroglyphs cycle, the selected symbol locks in with a stinger sound.
- Each free spin: standard spin sound, but with anticipation tension when the expanding symbol lands on early reels.
- Expansion animation: the symbol glows, expands vertically with a sand-and-light effect, then locks across all three rows.
- Multi-reel expansion: the camera pulls back slightly, hieroglyphic glyphs flash across the screen.
- Big-win cascade: orchestral build, gold-coin shower, the Pharaoh's stone mask glares from the side as the win number ticks up.
This is craft. Play'n GO have stayed in the Book genre for years specifically because they nail the theatre — the moment of symbol selection alone is more emotionally engaging than most other studios' entire bonus rounds.
Expansion in the base game
The expanding-symbol mechanic only fires during free spins. In the base game, all symbols land normally — no expansion. If you see a Wilde on a base-game spin, it's just one Wilde on that position, with no special treatment.
This is why the base game can feel like a holding pattern. There's no in-game equivalent to keep you engaged between bonuses — just paylines and the occasional gamble after a winning spin.
When the expanding symbol is the wild-scatter
This is impossible by design. The wild-scatter triggers the bonus and isn't included in the expanding-symbol selection pool. The selection is from the 10 paying symbols only.
This is occasionally a player complaint ("if the wild-scatter expanded that'd be max win automatic!") and reasonable studio design — adding the wild-scatter to the pool would unbalance the math.
Comparison with sticky-wild bonuses
Other slots use sticky wilds (wilds that lock in place for multiple spins). The expanding-symbol mechanic is different:
| Mechanic | How it works | Where it's used |
|---|---|---|
| Expanding symbol (Book family) | One random symbol expands to full reel when it lands | Legacy of Dead, Book of Dead, Book of Ra |
| Sticky wild | Wilds stay in place for the rest of the round | Reel King, some Pragmatic Play titles |
| Walking wild | Wild moves across reels each spin | Jack Hammer, some NetEnt titles |
| Stacked wild | Wilds appear in vertical stacks | Many older slots |
The Book-style expansion mechanic is uniquely volatile: the round's ceiling is set the moment the symbol is selected, which creates the lottery-style anticipation that other wild mechanics don't replicate.
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Quick FAQ
Can I influence which symbol gets selected? No — pure RNG, drawn fresh per bonus.
Does the expanding symbol carry over between bonus rounds? No — each bonus round draws fresh.
Does the selected symbol change during the round? No — once selected at the start, it stays the same for all 10 spins and any retrigger extensions.
Can the wild-scatter be the expanding symbol? No — it's excluded from the selection pool.
What if a card-rank gets selected? Modest payout round. It happens. Move on.
Does the expanding symbol pay regular line wins too? Yes — it's a normal paying symbol that also expands when landed. Standard line-pay applies even before expansion logic.
Are the expansions random or determined by symbol position? The expansion is triggered whenever the selected symbol lands on a reel where a payline passes — effectively any reel position on rows 1-3 since the lines cover the full grid.
About this expanding-symbol breakdown
Bonus-round behaviour observed across 12+ rounds in our 300-spin test set, supplemented by replays from verified big-win compilations on YouTube and slot-community channels. Selection frequencies and outcome shapes are empirical from our test set; treat them as guidance, not certified math.
Gambling responsibly. The expanding-symbol selection is the lottery within the lottery. Set deposit limits before depositing. AU support: gamblinghelponline.org.au · BetStop · 18+ only.
Further Reading
Related reading in this guide: