Best Slots with Expanding Symbols
Best slots with expanding symbols use a symbol mechanic that stretches a designated icon to cover an entire reel, changing how wins are formed across multiple paylines. This article covers the expanding symbol definition, types, mechanical impact, top 10 expanding symbol slot games, and strategy tips.
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What Expanding Symbols Mean in Online Slots
Expanding symbols are a type of symbol in online slots that start at a single grid position and expand to cover an entire reel when specific conditions are met. Expanding symbol slots use this full-reel coverage to create winning combinations across every payline that crosses the expanded reel. Expanding symbol slots replace single-position wins with column-wide coverage.
The expanding symbol mechanic originated in land-based slot machines and was popularized online by Novomatic's Book of Ra in 2005. Book of Ra introduced the 5×3 grid format with 9 paylines. The return to player (RTP) rate of Book of Ra Deluxe, the enhanced version, is 95.10%.
More than 15 providers now develop expanding symbol slots, including Play'n GO, Pragmatic Play, Blueprint Gaming, and Gamomat. The total number of expanding symbol titles exceeds 200 games. The mechanic has evolved from a single expanding-symbol format to variants with multiple expanding symbols, horizontal expansion, and Megaways integration.
How Expanding Symbols Change the Underlying Slot Mechanic
A standard slot evaluates wins based on symbols occupying single grid positions. The outcome changes when an expanding symbol stretches to cover every row on its reel.
- Win formation: Converts a single-position match into a full-column match, increasing paylines completed per reel
- Grid coverage: Covers 3 positions instead of 1 on a 5×3 grid, tripling the reel's win contribution
- Payout calculation: Pays on every active payline the expanded symbol crosses
- Feature interaction: Activates most frequently during free spins, though some games trigger expansion in the base game
- Trigger frequency: Requires the symbol to form a win or appear during a specific bonus phase
- Volatility impact: Increases volatility by concentrating larger payouts into fewer events
Example: a standard spin lands 3 matching symbols across 2 paylines for a $4 payout. The same spin with an expanding symbol on reel 3 converts that reel into a full column, increasing the number of paylines from 2 to 6. The payout rises from $4 to $12 on the same $1 stake.
Types of Expanding Symbols in Online Slots
Expanding symbols appear in 4 main types across online slot games. The 4 types are full-reel expanding, partial expanding, expanding with multiplier, and bonus-exclusive expanding.
Full-Reel Expanding
Full-reel expanding symbols stretch to cover every row on the reel where they land. Full-reel expanding symbols produce the maximum possible grid coverage per activation.
- Grid behavior: Covers all 3 rows on a 5×3 grid or all 4 rows on a 5×4 grid
- Activation trigger: Activates when the symbol lands during free spins and forms part of a win
- Common games: Book of Dead by Play'n GO, Book of Ra Deluxe by Novomatic
Partial Expanding
Partial expanding symbols stretch to cover 2 of 3 rows instead of the entire reel. Partial expanding symbols produce moderate grid coverage without full-column status.
- Grid behavior: Covers 2 adjacent positions on a 3-row grid
- Activation trigger: Activates in specific positions or during base game conditions
- Common games: Rise of Egypt by Playson, Eye of the Dragon by Novomatic
Expanding with Multiplier
Expanding symbols with multipliers combine full-reel stretch with a payout modifier. Expanding symbols with multipliers amplify both coverage and value per payline hit.
- Grid behavior: Covers the full reel and applies a 2x, 3x, or higher multiplier to all wins
- Activation trigger: Activates during free spins, where the multiplier is assigned alongside expansion
- Common games: Legacy of Ra Megaways by Blueprint Gaming, Book of Tut Megaways by Pragmatic Play
Bonus-Exclusive Expanding
Bonus-exclusive expanding symbols only activate during free spins or bonus features. Bonus-exclusive expanding symbols do not stretch during the base game.
- Grid behavior: Single-position in base game; expands to full reel during bonus
- Activation trigger: Requires active free spins; a random symbol is selected at the bonus start
- Common games: Doom of Egypt by Play'n GO, Ramses Book by Gamomat
Expanding Symbols vs Stacked Symbols: Key Differences
Expanding symbols and stacked symbols both increase reel coverage through different mechanics. The primary difference is that expanding symbols grow from a single position to fill a reel, while stacked symbols arrive as a pre-formed vertical block.
| Aspect | Expanding Symbols | Stacked Symbols |
|---|---|---|
| Grid coverage | Grows from 1 position to full reel upon activation | Lands as a block of 2–5 positions |
| Activation trigger | Requires bonus phase or winning combination | Appears naturally on any qualifying spin |
| Win formation | Guaranteed full-reel coverage when triggered | Variable coverage depending on stack size |
| Volatility tendency | High; concentrated into bonus rounds | Medium to high; active in base and bonus |
| Base vs bonus frequency | Primarily bonus-exclusive | Active in both game phases |
| Common providers | Play'n GO, Novomatic, Pragmatic Play | NetEnt, Microgaming, IGT |
Expanding symbols suit players who prefer guaranteed full-reel coverage during bonus events. Stacked symbols suit players who prefer variable base game coverage.
Top 10 Best Slots with Expanding Symbols
The 10 slots below are selected for expanding symbol quality, RTP, provider reputation, and player popularity.
Book of Dead (Play'n GO)
Book of Dead is a 10-payline Egyptian adventure slot starring explorer Rich Wilde. Book of Dead uses a randomly selected expanding symbol during free spins that covers entire reels.
- Provider: Play'n GO
- RTP: 96.21%
- Volatility: High
- Grid: 5 × 3
- Max win: 5,000x stake
Book of Ra Deluxe (Novomatic)
Book of Ra Deluxe is the enhanced version of the slot that introduced expanding symbols to online gaming. Book of Ra Deluxe awards 10 free spins with a randomly chosen expanding symbol.
- Provider: Novomatic
- RTP: 95.10%
- Volatility: High
- Grid: 5 × 3
- Max win: 5,000x stake
Legacy of Dead (Play'n GO)
Legacy of Dead is an Egyptian-themed slot with a scatter collection meter that triggers the bonus after 100 scatters. Legacy of Dead awards multiple expanding icons on retrigger.
- Provider: Play'n GO
- RTP: 96.58%
- Volatility: High
- Grid: 5 × 3
- Max win: 25,000x stake
Doom of Egypt (Play'n GO)
Doom of Egypt is an Egyptian tomb-themed slot with a scarab serving as both wild and scatter. Doom of Egypt selects a random expanding symbol at the start of free spins.
- Provider: Play'n GO
- RTP: 96.21%
- Volatility: High
- Grid: 5 × 3
- Max win: 5,000x stake
Legacy of Ra Megaways (Blueprint Gaming)
Legacy of Ra Megaways is a 6-reel Megaways slot with up to 15,625 ways to win. Legacy of Ra Megaways assigns a random expanding symbol that combines with the variable reel system.
- Provider: Blueprint Gaming
- RTP: 96.01%
- Volatility: High
- Grid: 6 reels (variable rows)
- Max win: 50,000x stake
Ramses Book (Gamomat)
Ramses Book is a 10-payline Egyptian slot with a classic "Book of" structure. Ramses Book awards 10 free spins with a randomly selected expanding symbol.
- Provider: Gamomat
- RTP: 96.15%
- Volatility: High
- Grid: 5 × 3
- Max win: 6,716x stake
Book of Tut Megaways (Pragmatic Play)
Book of Tut Megaways is a 6-reel Megaways slot merging expanding symbols with up to 117,649 ways to win. Book of Tut Megaways selects an expanding symbol during free spins that stretches across variable-height reels.
- Provider: Pragmatic Play
- RTP: 96.00%
- Volatility: High
- Grid: 6 reels (variable rows)
- Max win: 10,000x stake
Sword of Shoguns (Thunderkick)
Sword of Shoguns is a 25-payline Japanese warrior-themed slot with up to 15 starting free spins. Sword of Shoguns awards additional expanding icons on retrigger.
- Provider: Thunderkick
- RTP: 96.58%
- Volatility: High
- Grid: 5 × 3
- Max win: 25,000x stake
Rise of Egypt (Playson)
Rise of Egypt is a 25-payline Egyptian-themed slot with expanding wilds during free spins. Rise of Egypt stretches wild symbols to fill entire reels during the bonus phase.
- Provider: Playson
- RTP: 95.36%
- Volatility: Medium-High
- Grid: 5 × 3
- Max win: 5,000x stake
Cat Wilde and the Eclipse of the Sun God (Play'n GO)
Cat Wilde and the Eclipse of the Sun God is a 10-payline Aztec adventure slot. Cat Wilde uses expanding symbols during free spins with a collection mechanic that adds a second expanding icon on retrigger.
- Provider: Play'n GO
- RTP: 96.20%
- Volatility: High
- Grid: 5 × 3
- Max win: 10,000x stake
Pros and Cons of Expanding Symbol Slots
Expanding symbol slots have 4 prominent advantages and 4 trade-offs compared to standard symbol mechanics.
| Aspect | Advantage | Trade-off |
|---|---|---|
| Win potential | Increases paylines completed per spin through full-reel coverage | Concentrates larger wins into less frequent bonus events |
| Visual clarity | Displays expansion visibly on the grid for transparent tracking | Adds animation sequences that extend spin resolution time |
| Trigger frequency | Activates during free spins, creating a reliable bonus structure | Requires more base game spins to encounter |
| Bankroll impact | Delivers higher average payout per activation than single-position wins | Produces longer dry stretches between activations |
Expanding symbol slots suit players who prefer high-impact bonus events and accept less frequent activations as the trade-off for full-reel coverage.
Tips for Playing Expanding Symbol Slots
- Check the RTP before playing. Expanding symbol slots range from 94% to 97% RTP. Legacy of Dead offers 96.58%, while Book of Ra Deluxe offers 95.10%.
- Start with the minimum bet to observe trigger frequency. Play 20 to 30 spins at the lowest stake to track how often the free spins bonus activates.
- Identify which symbol is selected as the expander. High-value symbols produce larger payouts per expansion. Low-value symbols expand more often but pay less.
- Compare behavior across providers. Play'n GO, Novomatic, and Blueprint Gaming use different trigger thresholds, grid sizes, and retrigger rules.
- Set a session budget before spinning. Expanding symbol slots are high volatility and require sustained base game play before the bonus triggers.
Summary
Expanding symbols are a slot symbol type that stretches a designated icon across an entire reel to form full-column wins on every crossing payline. The mechanic suits players who prefer high-volatility bonus events with concentrated payout potential. The primary risk is bankroll depletion during base game stretches between triggers. Start with Book of Dead or Legacy of Dead to experience expanding symbols at their best.
Learn More About Other Slot Symbols
FAQ
What are expanding symbols in online slots?
Expanding symbols are icons that grow from a single grid position to cover an entire reel, creating wins across all crossing paylines.
How do expanding symbols work in slot games?
A symbol is selected at the start of free spins. Each time it lands and forms a win, it stretches to fill the entire column.
What are the types of expanding symbols in slots?
The 4 types are full-reel expanding, partial expanding, expanding with multiplier, and bonus-exclusive expanding.
How do expanding symbols change the slot mechanic?
They convert single-position matches into full-column matches, increasing paylines completed per spin.
Which online slots use expanding symbols?
Prominent titles include Book of Dead by Play'n GO, Book of Ra Deluxe by Novomatic, and Legacy of Dead by Play'n GO.
What is the best slot with expanding symbols?
Legacy of Dead by Play'n GO ranks among the best for its 96.58% RTP and 25,000x maximum win.
Are expanding symbols available in free play or demo mode?
Yes, most licensed online casinos offer demo versions with virtual credits and identical mechanics.
Are expanding symbol slots high- or low-volatility?
Expanding symbol slots are mostly high volatility. The expansion concentrates wins into free spins rounds.
