Relax Gaming
Theoretical RTP
99.00%
Slot CategoriesAuthor: Sofia LindgrenRead time: 6 minLast updated: April 17, 2026monthly refresh
Expanding Wild Slots UK: Book-of Games & Beyond by RTP
The expanding-symbol mechanic — pioneered by Book of Ra and refined across hundreds of titles — ranked by deployed RTP.
Expanding wilds are symbols that grow to fill their entire reel when they land — or in the 'Book of' mechanic, a random symbol is chosen during free spins to expand whenever enough instances appear. This mechanic creates the slot genre's most concentrated payout events: when the expanding symbol fills multiple reels simultaneously, the result is a massive multi-payline win.
Book of Dead popularised the expanding-symbol free spins format, but the mechanic extends beyond 'Book' titles to games like Jack and the Beanstalk (Walking Wilds that expand), Vikings Go Berzerk (Berzerk wilds that fill reels), and many others.
Every 'Book of' and expanding wild game from major providers uses variable-tier deployment. The expanding mechanic creates high volatility — most of the game's meaningful returns are concentrated in rare full-reel expansion events. Verifying the deployed RTP tier is critical.
SL
Written by Sofia Lindgren
Slots Comparison Editor · April 17, 2026
How the 'Book of' mechanic works
Three Book scatter symbols trigger free spins (typically 10). Before the round begins, one regular symbol is chosen at random as the 'special expanding symbol' for that round. During the free spins, whenever the chosen symbol lands enough times to be a winning combination, all instances of it expand to fill their reels and pay across all paylines.
If the high-paying symbol (often the explorer/Pharaoh in Book of Ra-style titles) is selected and expands across all five reels, the resulting payout can hit the maximum win cap. If a low-paying symbol is selected, the round produces only modest returns. The randomness of the special symbol selection drives most of the volatility.
Walking and shifting wilds
Some titles vary the format. NetEnt's Jack and the Beanstalk uses 'Walking Wilds' — wild symbols that move one reel left after each spin during free spins, persisting until they exit the grid. Narcos uses similar shifting mechanics with respin triggers. Vikings Go Berzerk uses Berzerk Wilds that grow over multiple spins.
All variations share the core principle: a wild symbol persists or expands beyond a single spin, dramatically inflating the value of the spin sequence in which it appears.
Why deployment tier matters more here
Because so much of the RTP is concentrated in the expansion event, a lower deployed tier directly reduces the size of those events — not the frequency. A 94% Book of Dead doesn't trigger free spins less often than a 96.21% Book of Dead; it just pays less when the expansion lands. That makes tier reductions especially painful.
The Book of Dead variants guide documents the major versions in circulation. Always check the in-game info panel before assuming the headline RTP is what you are receiving.
Expanding Wilds Slots ranked by RTP
Pulled live from the RTPTrack database, sorted by theoretical RTP descending. Filter by provider or volatility.
Thunderkick
Theoretical RTP
98.60%
Thunderkick
Theoretical RTP
98.50%
Booming Games
Theoretical RTP
98.27%
NextGen
Theoretical RTP
97.87%
Habanero
Theoretical RTP
97.84%
Big Time Gaming
Theoretical RTP
97.77%
Red Tiger
Theoretical RTP
97.66%
BGaming
Theoretical RTP
97.34%
BGaming
Theoretical RTP
97.34%
BGaming
Theoretical RTP
97.34%
BGaming
Theoretical RTP
97.34%
Popiplay
Theoretical RTP
97.28%
Popiplay
Theoretical RTP
97.28%
Popiplay
Theoretical RTP
97.28%
BGaming
Theoretical RTP
97.21%
BGaming
Theoretical RTP
97.21%
Print Studios
Theoretical RTP
97.20%
BGaming
Theoretical RTP
97.10%
Popiplay
Theoretical RTP
97.09%
Popiplay
Theoretical RTP
97.04%
Blueprint Gaming
Theoretical RTP
97.01%
Big Time Gaming
Theoretical RTP
97.00%
BGaming
Theoretical RTP
97.00%
BGaming
Theoretical RTP
97.00%
BGaming
Theoretical RTP
97.00%
BGaming
Theoretical RTP
97.00%
BGaming
Theoretical RTP
97.00%
Yggdrasil Gaming
Theoretical RTP
97.00%
NetEnt
Theoretical RTP
97.00%
BGaming
Theoretical RTP
96.99%
Games Global
Theoretical RTP
96.98%
Habanero
Theoretical RTP
96.91%
Play'n GO
Theoretical RTP
96.89%
BGaming
Theoretical RTP
96.89%
NetEnt
Theoretical RTP
96.88%
Yggdrasil Gaming
Theoretical RTP
96.80%
Yggdrasil Gaming
Theoretical RTP
96.80%
Popiplay
Theoretical RTP
96.80%
Habanero
Theoretical RTP
96.79%
Habanero
Theoretical RTP
96.75%
NetEnt
Theoretical RTP
96.74%
Popiplay
Theoretical RTP
96.72%
Pragmatic Play
Theoretical RTP
96.71%
Habanero
Theoretical RTP
96.71%
BGaming
Theoretical RTP
96.70%
NetEnt
Theoretical RTP
96.70%
NetEnt
Theoretical RTP
96.70%
Habanero
Theoretical RTP
96.70%
Habanero
Theoretical RTP
96.70%
Habanero
Theoretical RTP
96.70%
Habanero
Theoretical RTP
96.70%
Habanero
Theoretical RTP
96.70%
Big Time Gaming
Theoretical RTP
96.69%
NetEnt
Theoretical RTP
96.68%
Slingo Originals
Theoretical RTP
96.66%
Play'n GO
Theoretical RTP
96.65%
Relax Gaming
Theoretical RTP
96.65%
Quickspin
Theoretical RTP
96.63%
Habanero
Theoretical RTP
96.61%
Play'n GO
Theoretical RTP
96.60%
Big Time Gaming
Theoretical RTP
96.60%
NetEnt
Theoretical RTP
96.60%
Booming Games
Theoretical RTP
96.60%
Betsoft
Theoretical RTP
96.60%
Foxium
Theoretical RTP
96.60%
Play'n GO
Theoretical RTP
96.59%
Play'n GO
Theoretical RTP
96.58%
Play'n GO
Theoretical RTP
96.58%
Play'n GO
Theoretical RTP
96.58%
Play'n GO
Theoretical RTP
96.58%
Play'n GO
Theoretical RTP
96.58%
NetEnt
Theoretical RTP
96.58%
Habanero
Theoretical RTP
96.58%
Quickspin
Theoretical RTP
96.58%
Habanero
Theoretical RTP
96.57%
Pragmatic Play
Theoretical RTP
96.55%
Pragmatic Play
Theoretical RTP
96.55%
Print Studios
Theoretical RTP
96.55%
Big Time Gaming
Theoretical RTP
96.54%
Play'n GO
Theoretical RTP
96.53%
Play'n GO
Theoretical RTP
96.53%
Quickspin
Theoretical RTP
96.53%
Play'n GO
Theoretical RTP
96.51%
Play'n GO
Theoretical RTP
96.51%
Pragmatic Play
Theoretical RTP
96.51%
Print Studios
Theoretical RTP
96.51%
Quickspin
Theoretical RTP
96.51%
GameArt
Theoretical RTP
96.51%
Hacksaw Gaming
Theoretical RTP
96.50%
Play'n GO
Theoretical RTP
96.50%
Play'n GO
Theoretical RTP
96.50%
Play'n GO
Theoretical RTP
96.50%
Pragmatic Play
Theoretical RTP
96.50%
Pragmatic Play
Theoretical RTP
96.50%
Pragmatic Play
Theoretical RTP
96.50%
Pragmatic Play
Theoretical RTP
96.50%
Pragmatic Play
Theoretical RTP
96.50%
Pragmatic Play
Theoretical RTP
96.50%
Pragmatic Play
Theoretical RTP
96.50%
Pragmatic Play
Theoretical RTP
96.50%
Pragmatic Play
Theoretical RTP
96.50%
Pragmatic Play
Theoretical RTP
96.50%
Pragmatic Play
Theoretical RTP
96.50%
Pragmatic Play
Theoretical RTP
96.50%
Pragmatic Play
Theoretical RTP
96.50%
Print Studios
Theoretical RTP
96.50%
Yggdrasil Gaming
Theoretical RTP
96.50%
NetEnt
Theoretical RTP
96.50%
NetEnt
Theoretical RTP
96.50%
Pragmatic Play
Theoretical RTP
96.50%
Relax Gaming
Theoretical RTP
96.50%
Blueprint Gaming
Theoretical RTP
96.50%
Games Global
Theoretical RTP
96.50%
Play'n GO
Theoretical RTP
96.49%
Pragmatic Play
Theoretical RTP
96.49%
Pragmatic Play
Theoretical RTP
96.49%
Play'n GO
Theoretical RTP
96.48%
Pragmatic Play
Theoretical RTP
96.48%
Pragmatic Play
Theoretical RTP
96.48%
High Noon Studios
Theoretical RTP
96.48%
Pragmatic Play
Theoretical RTP
96.47%
NetEnt
Theoretical RTP
96.47%
Relax Gaming
Theoretical RTP
96.47%
Big Time Gaming
Theoretical RTP
96.46%
Pragmatic Play
Theoretical RTP
96.46%
Pragmatic Play
Theoretical RTP
96.46%
Print Studios
Theoretical RTP
96.45%
All For One Studios
Theoretical RTP
96.45%
Pragmatic Play
Theoretical RTP
96.44%
Print Studios
Theoretical RTP
96.44%
Pragmatic Play
Theoretical RTP
96.44%
Hacksaw Gaming
Theoretical RTP
96.42%
Pragmatic Play
Theoretical RTP
96.42%
NetEnt
Theoretical RTP
96.42%
Hacksaw Gaming
Theoretical RTP
96.41%
Yggdrasil Gaming
Theoretical RTP
96.40%
NetEnt
Theoretical RTP
96.40%
Games Global
Theoretical RTP
96.40%
Backseat Gaming
Theoretical RTP
96.37%
Backseat Gaming
Theoretical RTP
96.37%
Foxium
Theoretical RTP
96.37%
Play'n GO
Theoretical RTP
96.36%
Big Time Gaming
Theoretical RTP
96.36%
Hacksaw Gaming
Theoretical RTP
96.36%
Hacksaw Gaming
Theoretical RTP
96.36%
Backseat Gaming
Theoretical RTP
96.36%
Foxium
Theoretical RTP
96.36%
GameArt
Theoretical RTP
96.36%
Big Time Gaming
Theoretical RTP
96.35%
Hacksaw Gaming
Theoretical RTP
96.35%
Hacksaw Gaming
Theoretical RTP
96.35%
Relax Gaming
Theoretical RTP
96.35%
Blueprint Gaming
Theoretical RTP
96.35%
Triple Edge Studios
Theoretical RTP
96.35%
Play'n GO
Theoretical RTP
96.34%
Booming Games
Theoretical RTP
96.33%
Betsoft
Theoretical RTP
96.33%
Hacksaw Gaming
Theoretical RTP
96.32%
Foxhound Games
Theoretical RTP
96.32%
Blueprint Gaming
Theoretical RTP
96.32%
Play'n GO
Theoretical RTP
96.31%
Play'n GO
Theoretical RTP
96.31%
Hacksaw Gaming
Theoretical RTP
96.31%
Ace Roll
Theoretical RTP
96.31%
iSoftBet
Theoretical RTP
96.31%
Blueprint Gaming
Theoretical RTP
96.31%
Triple Edge Studios
Theoretical RTP
96.31%
Triple Edge Studios
Theoretical RTP
96.31%
Yggdrasil
Theoretical RTP
96.30%
Play'n GO
Theoretical RTP
96.30%
Hacksaw Gaming
Theoretical RTP
96.30%
Yggdrasil Gaming
Theoretical RTP
96.30%
NetEnt
Theoretical RTP
96.30%
NetEnt
Theoretical RTP
96.30%
Relax Gaming
Theoretical RTP
96.30%
Popiplay
Theoretical RTP
96.30%
Blueprint Gaming
Theoretical RTP
96.30%
Play'n GO
Theoretical RTP
96.29%
Play'n GO
Theoretical RTP
96.29%
Play'n GO
Theoretical RTP
96.29%
Hacksaw Gaming
Theoretical RTP
96.29%
Hacksaw Gaming
Theoretical RTP
96.29%
Trusty Gaming
Theoretical RTP
96.29%
Habanero
Theoretical RTP
96.29%
Quickspin
Theoretical RTP
96.29%
GameArt
Theoretical RTP
96.29%
GameArt
Theoretical RTP
96.29%
NetEnt
Theoretical RTP
96.28%
Play'n GO
Theoretical RTP
96.28%
Play'n GO
Theoretical RTP
96.28%
Play'n GO
Theoretical RTP
96.28%
Play'n GO
Theoretical RTP
96.28%
Hacksaw Gaming
Theoretical RTP
96.28%
Backseat Gaming
Theoretical RTP
96.28%
Backseat Gaming
Theoretical RTP
96.28%
Red Tiger
Theoretical RTP
96.28%
Play'n GO
Theoretical RTP
96.27%
Pragmatic Play
Theoretical RTP
96.27%
NetEnt
Theoretical RTP
96.27%
All For One Studios
Theoretical RTP
96.27%
Hacksaw Gaming
Theoretical RTP
96.26%
Print Studios
Theoretical RTP
96.26%
NetEnt
Theoretical RTP
96.26%
Play'n GO
Theoretical RTP
96.25%
Play'n GO
Theoretical RTP
96.25%
Play'n GO
Theoretical RTP
96.25%
Play'n GO
Theoretical RTP
96.25%
Hacksaw Gaming
Theoretical RTP
96.24%
Play'n GO
Theoretical RTP
96.24%
Play'n GO
Theoretical RTP
96.24%
Bullshark Games
Theoretical RTP
96.24%
Hacksaw Gaming
Theoretical RTP
96.23%
Hacksaw Gaming
Theoretical RTP
96.23%
NetEnt
Theoretical RTP
96.23%
Betsoft
Theoretical RTP
96.23%
Play'n GO
Theoretical RTP
96.22%
Hacksaw Gaming
Theoretical RTP
96.22%
Hacksaw Gaming
Theoretical RTP
96.22%
Quickspin
Theoretical RTP
96.22%
Play'n GO
Theoretical RTP
96.21%
Play'n GO
Theoretical RTP
96.21%
Play'n GO
Theoretical RTP
96.21%
Play'n GO
Theoretical RTP
96.21%
Play'n GO
Theoretical RTP
96.21%
Play'n GO
Theoretical RTP
96.21%
Play'n GO
Theoretical RTP
96.21%
Trusty Gaming
Theoretical RTP
96.21%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Hacksaw Gaming
Theoretical RTP
96.20%
Play'n GO
Theoretical RTP
96.20%
Yggdrasil Gaming
Theoretical RTP
96.20%
Yggdrasil Gaming
Theoretical RTP
96.20%
Yggdrasil Gaming
Theoretical RTP
96.20%
Yggdrasil Gaming
Theoretical RTP
96.20%
Yggdrasil Gaming
Theoretical RTP
96.20%
NetEnt
Theoretical RTP
96.20%
NetEnt
Theoretical RTP
96.20%
Red Tiger
Theoretical RTP
96.20%
Red Tiger
Theoretical RTP
96.20%
Red Tiger
Theoretical RTP
96.20%
Iron Dog Studio
Theoretical RTP
96.20%
Neon Valley Studios
Theoretical RTP
96.20%
All For One Studios
Theoretical RTP
96.20%
Quickspin
Theoretical RTP
96.19%
Games Global
Theoretical RTP
96.19%
Triple Edge Studios
Theoretical RTP
96.19%
GameArt
Theoretical RTP
96.19%
Play'n GO
Theoretical RTP
96.18%
Play'n GO
Theoretical RTP
96.18%
NetEnt
Theoretical RTP
96.18%
Red Tiger
Theoretical RTP
96.18%
Red Tiger
Theoretical RTP
96.18%
Backseat Gaming
Theoretical RTP
96.18%
Quickspin
Theoretical RTP
96.18%
Slingshot Studios
Theoretical RTP
96.18%
Gamomat
Theoretical RTP
96.16%
Gamomat
Theoretical RTP
96.16%
NetEnt
Theoretical RTP
96.16%
Bullshark Games
Theoretical RTP
96.16%
Gamomat
Theoretical RTP
96.16%
Quickspin
Theoretical RTP
96.16%
Gamomat
Theoretical RTP
96.15%
Gamomat
Theoretical RTP
96.15%
Gamomat
Theoretical RTP
96.15%
Gamomat
Theoretical RTP
96.15%
Gamomat
Theoretical RTP
96.15%
Gamomat
Theoretical RTP
96.15%
Gamomat
Theoretical RTP
96.15%
Gamomat
Theoretical RTP
96.15%
Gamomat
Theoretical RTP
96.15%
Gamomat
Theoretical RTP
96.15%
Gamomat
Theoretical RTP
96.15%
Gamomat
Theoretical RTP
96.15%
Gamomat
Theoretical RTP
96.15%
Quickspin
Theoretical RTP
96.15%
GameArt
Theoretical RTP
96.15%
Just For The Win
Theoretical RTP
96.15%
Gamomat
Theoretical RTP
96.14%
Gamomat
Theoretical RTP
96.14%
Gamomat
Theoretical RTP
96.14%
Gamomat
Theoretical RTP
96.14%
Gamomat
Theoretical RTP
96.14%
Gamomat
Theoretical RTP
96.14%
Gamomat
Theoretical RTP
96.14%
Hacksaw Gaming
Theoretical RTP
96.13%
Pragmatic Play
Theoretical RTP
96.13%
BGaming
Theoretical RTP
96.13%
BGaming
Theoretical RTP
96.13%
BGaming
Theoretical RTP
96.13%
Gamomat
Theoretical RTP
96.13%
Gamomat
Theoretical RTP
96.13%
Gamomat
Theoretical RTP
96.13%
Gamomat
Theoretical RTP
96.13%
Wazdan
Theoretical RTP
96.13%
Gamomat
Theoretical RTP
96.12%
Gamomat
Theoretical RTP
96.12%
Red Tiger
Theoretical RTP
96.12%
Red Tiger
Theoretical RTP
96.12%
Gamomat
Theoretical RTP
96.12%
Foxium
Theoretical RTP
96.12%
GameArt
Theoretical RTP
96.12%
Gamomat
Theoretical RTP
96.11%
Gamomat
Theoretical RTP
96.11%
Gamomat
Theoretical RTP
96.11%
Red Tiger
Theoretical RTP
96.11%
Red Tiger
Theoretical RTP
96.11%
Gamomat
Theoretical RTP
96.11%
Gamomat
Theoretical RTP
96.11%
Gamomat
Theoretical RTP
96.11%
Gamomat
Theoretical RTP
96.11%
Gamomat
Theoretical RTP
96.11%
Gamomat
Theoretical RTP
96.11%
Relax Gaming
Theoretical RTP
96.11%
Quickspin
Theoretical RTP
96.11%
Yggdrasil Gaming
Theoretical RTP
96.10%
Yggdrasil Gaming
Theoretical RTP
96.10%
Thunderkick
Theoretical RTP
96.10%
Thunderkick
Theoretical RTP
96.10%
Gamomat
Theoretical RTP
96.10%
Gamomat
Theoretical RTP
96.10%
Gamomat
Theoretical RTP
96.10%
Gamomat
Theoretical RTP
96.10%
Gamomat
Theoretical RTP
96.10%
Gamomat
Theoretical RTP
96.10%
Gamomat
Theoretical RTP
96.10%
ELK Studios
Theoretical RTP
96.10%
NetEnt
Theoretical RTP
96.10%
Red Tiger
Theoretical RTP
96.10%
Red Tiger
Theoretical RTP
96.10%
Red Tiger
Theoretical RTP
96.10%
Red Tiger
Theoretical RTP
96.10%
Red Tiger
Theoretical RTP
96.10%
Gamomat
Theoretical RTP
96.10%
Gamomat
Theoretical RTP
96.10%
Gamomat
Theoretical RTP
96.10%
Gamomat
Theoretical RTP
96.10%
Relax Gaming
Theoretical RTP
96.10%
Relax Gaming
Theoretical RTP
96.10%
Quickspin
Theoretical RTP
96.10%
Blueprint Gaming
Theoretical RTP
96.10%
Just For The Win
Theoretical RTP
96.10%
NetEnt
Theoretical RTP
96.09%
Quickspin
Theoretical RTP
96.09%
NetEnt
Theoretical RTP
96.08%
Pragmatic Play
Theoretical RTP
96.08%
Gamomat
Theoretical RTP
96.08%
NetEnt
Theoretical RTP
96.08%
Quickspin
Theoretical RTP
96.08%
Betsoft
Theoretical RTP
96.08%
Pragmatic Play
Theoretical RTP
96.07%
Pragmatic Play
Theoretical RTP
96.07%
BGaming
Theoretical RTP
96.07%
Quickspin
Theoretical RTP
96.07%
Endorphina
Theoretical RTP
96.07%
Endorphina
Theoretical RTP
96.07%
Endorphina
Theoretical RTP
96.07%
Endorphina
Theoretical RTP
96.07%
Gamomat
Theoretical RTP
96.06%
NetEnt
Theoretical RTP
96.06%
NetEnt
Theoretical RTP
96.06%
Red Tiger
Theoretical RTP
96.06%
Quickspin
Theoretical RTP
96.06%
Endorphina
Theoretical RTP
96.06%
Endorphina
Theoretical RTP
96.06%
Endorphina
Theoretical RTP
96.06%
Pragmatic Play
Theoretical RTP
96.05%
Gamomat
Theoretical RTP
96.05%
Gamomat
Theoretical RTP
96.05%
Gamomat
Theoretical RTP
96.05%
Gamomat
Theoretical RTP
96.05%
Gamomat
Theoretical RTP
96.05%
Gamomat
Theoretical RTP
96.05%
NetEnt
Theoretical RTP
96.05%
Endorphina
Theoretical RTP
96.05%
Endorphina
Theoretical RTP
96.05%
Endorphina
Theoretical RTP
96.05%
Endorphina
Theoretical RTP
96.05%
Endorphina
Theoretical RTP
96.05%
Endorphina
Theoretical RTP
96.05%
Endorphina
Theoretical RTP
96.05%
Endorphina
Theoretical RTP
96.05%
Endorphina
Theoretical RTP
96.05%
Endorphina
Theoretical RTP
96.05%
NetEnt
Theoretical RTP
96.04%
Popiplay
Theoretical RTP
96.04%
Endorphina
Theoretical RTP
96.04%
Endorphina
Theoretical RTP
96.04%
Endorphina
Theoretical RTP
96.04%
Endorphina
Theoretical RTP
96.04%
Endorphina
Theoretical RTP
96.04%
Endorphina
Theoretical RTP
96.04%
Endorphina
Theoretical RTP
96.04%
Endorphina
Theoretical RTP
96.04%
Endorphina
Theoretical RTP
96.04%
Endorphina
Theoretical RTP
96.04%
Endorphina
Theoretical RTP
96.04%
Endorphina
Theoretical RTP
96.04%
Endorphina
Theoretical RTP
96.04%
GameArt
Theoretical RTP
96.04%
PearFiction Studios
Theoretical RTP
96.04%
NetEnt
Theoretical RTP
96.03%
NetEnt
Theoretical RTP
96.03%
Red Tiger
Theoretical RTP
96.03%
Red Tiger
Theoretical RTP
96.03%
Endorphina
Theoretical RTP
96.03%
Endorphina
Theoretical RTP
96.03%
Endorphina
Theoretical RTP
96.03%
Endorphina
Theoretical RTP
96.03%
Blueprint Gaming
Theoretical RTP
96.03%
GameArt
Theoretical RTP
96.03%
Gamomat
Theoretical RTP
96.02%
Gamomat
Theoretical RTP
96.02%
Gamomat
Theoretical RTP
96.02%
Gamomat
Theoretical RTP
96.02%
NetEnt
Theoretical RTP
96.02%
Red Tiger
Theoretical RTP
96.02%
Endorphina
Theoretical RTP
96.02%
Endorphina
Theoretical RTP
96.02%
Endorphina
Theoretical RTP
96.02%
Just For The Win
Theoretical RTP
96.02%
Red Tiger
Theoretical RTP
96.01%
Endorphina
Theoretical RTP
96.01%
Endorphina
Theoretical RTP
96.01%
Endorphina
Theoretical RTP
96.01%
Endorphina
Theoretical RTP
96.01%
Endorphina
Theoretical RTP
96.01%
Endorphina
Theoretical RTP
96.01%
Blueprint Gaming
Theoretical RTP
96.01%
GameArt
Theoretical RTP
96.01%
Play'n GO
Theoretical RTP
96.00%
Pragmatic Play
Theoretical RTP
96.00%
BGaming
Theoretical RTP
96.00%
BGaming
Theoretical RTP
96.00%
Yggdrasil Gaming
Theoretical RTP
96.00%
Thunderkick
Theoretical RTP
96.00%
Gamomat
Theoretical RTP
96.00%
NetEnt
Theoretical RTP
96.00%
NetEnt
Theoretical RTP
96.00%
NetEnt
Theoretical RTP
96.00%
NetEnt
Theoretical RTP
96.00%
NetEnt
Theoretical RTP
96.00%
Gamomat
Theoretical RTP
96.00%
Gamomat
Theoretical RTP
96.00%
Quickspin
Theoretical RTP
96.00%
Quickspin
Theoretical RTP
96.00%
Quickspin
Theoretical RTP
96.00%
Quickspin
Theoretical RTP
96.00%
iSoftBet
Theoretical RTP
96.00%
iSoftBet
Theoretical RTP
96.00%
Endorphina
Theoretical RTP
96.00%
Endorphina
Theoretical RTP
96.00%
Betsoft
Theoretical RTP
96.00%
Four Leaf Gaming
Theoretical RTP
96.00%
GameArt
Theoretical RTP
96.00%
GameArt
Theoretical RTP
96.00%
Iron Dog Studio
Theoretical RTP
96.00%
Iron Dog Studio
Theoretical RTP
96.00%
Iron Dog Studio
Theoretical RTP
96.00%
ReelPlay
Theoretical RTP
96.00%
PearFiction Studios
Theoretical RTP
96.00%
Betsoft
Theoretical RTP
95.96%
BGaming
Theoretical RTP
95.90%
Booming Games
Theoretical RTP
95.90%
Booming Games
Theoretical RTP
95.90%
Booming Games
Theoretical RTP
95.90%
Booming Games
Theoretical RTP
95.89%
Red Tiger
Theoretical RTP
95.80%
Booming Games
Theoretical RTP
95.80%
Booming Games
Theoretical RTP
95.80%
Red Tiger
Theoretical RTP
95.78%
Red Tiger
Theoretical RTP
95.77%
Red Tiger
Theoretical RTP
95.76%
Red Tiger
Theoretical RTP
95.75%
Red Tiger
Theoretical RTP
95.75%
Red Tiger
Theoretical RTP
95.75%
Red Tiger
Theoretical RTP
95.75%
Relax Gaming
Theoretical RTP
95.75%
Red Tiger
Theoretical RTP
95.74%
Red Tiger
Theoretical RTP
95.74%
Red Tiger
Theoretical RTP
95.74%
Red Tiger
Theoretical RTP
95.74%
Red Tiger
Theoretical RTP
95.74%
Red Tiger
Theoretical RTP
95.73%
Red Tiger
Theoretical RTP
95.73%
Red Tiger
Theoretical RTP
95.73%
Red Tiger
Theoretical RTP
95.73%
Blueprint Gaming
Theoretical RTP
95.73%
Red Tiger
Theoretical RTP
95.72%
Red Tiger
Theoretical RTP
95.72%
Red Tiger
Theoretical RTP
95.72%
Red Tiger
Theoretical RTP
95.72%
Red Tiger
Theoretical RTP
95.72%
Red Tiger
Theoretical RTP
95.72%
Red Tiger
Theoretical RTP
95.70%
Red Tiger
Theoretical RTP
95.70%
Red Tiger
Theoretical RTP
95.70%
Red Tiger
Theoretical RTP
95.70%
Red Tiger
Theoretical RTP
95.70%
Red Tiger
Theoretical RTP
95.70%
Booming Games
Theoretical RTP
95.70%
Red Tiger
Theoretical RTP
95.69%
Red Tiger
Theoretical RTP
95.69%
Red Tiger
Theoretical RTP
95.69%
Red Tiger
Theoretical RTP
95.68%
Booming Games
Theoretical RTP
95.68%
Red Tiger
Theoretical RTP
95.67%
Red Tiger
Theoretical RTP
95.66%
Red Tiger
Theoretical RTP
95.66%
Red Tiger
Theoretical RTP
95.66%
Red Tiger
Theoretical RTP
95.66%
Red Tiger
Theoretical RTP
95.60%
Blueprint Gaming
Theoretical RTP
95.53%
Relax Gaming
Theoretical RTP
95.51%
BGaming
Theoretical RTP
95.50%
Booming Games
Theoretical RTP
95.50%
Booming Games
Theoretical RTP
95.50%
Booming Games
Theoretical RTP
95.50%
Booming Games
Theoretical RTP
95.50%
Blueprint Gaming
Theoretical RTP
95.49%
Blueprint Gaming
Theoretical RTP
95.49%
Booming Games
Theoretical RTP
95.40%
Booming Games
Theoretical RTP
95.40%
Booming Games
Theoretical RTP
95.40%
Thunderkick
Theoretical RTP
95.36%
Red Tiger
Theoretical RTP
95.30%
Betsoft
Theoretical RTP
95.29%
Iron Dog Studio
Theoretical RTP
95.25%
Booming Games
Theoretical RTP
95.23%
Thunderkick
Theoretical RTP
95.21%
Red Tiger
Theoretical RTP
95.20%
Eyecon
Theoretical RTP
95.20%
Booming Games
Theoretical RTP
95.16%
Red Tiger
Theoretical RTP
95.10%
ELK Studios
Theoretical RTP
95.00%
Red Tiger
Theoretical RTP
95.00%
Blueprint Gaming
Theoretical RTP
95.00%
G.Games
Theoretical RTP
95.00%
Blueprint Gaming
Theoretical RTP
94.95%
BGaming
Theoretical RTP
94.94%
Hacksaw Gaming
Theoretical RTP
94.31%
All For One Studios
Theoretical RTP
94.24%
All For One Studios
Theoretical RTP
94.20%
Iron Dog Studio
Theoretical RTP
94.18%
Iron Dog Studio
Theoretical RTP
94.18%
Iron Dog Studio
Theoretical RTP
94.18%
Thunderkick
Theoretical RTP
94.17%
Foxium
Theoretical RTP
94.15%
Triple Edge Studios
Theoretical RTP
94.01%
Yggdrasil Gaming
Theoretical RTP
94.00%
ELK Studios
Theoretical RTP
94.00%
ELK Studios
Theoretical RTP
94.00%
ELK Studios
Theoretical RTP
94.00%
ELK Studios
Theoretical RTP
94.00%
ELK Studios
Theoretical RTP
94.00%
ELK Studios
Theoretical RTP
94.00%
Games Global
Theoretical RTP
94.00%
GameArt
Theoretical RTP
94.00%
Habanero
Theoretical RTP
93.96%
All For One Studios
Theoretical RTP
93.50%
Blueprint Gaming
Theoretical RTP
93.20%
iSoftBet
Theoretical RTP
92.50%
Play'n GO
Theoretical RTP
92.01%
Pragmatic Play
Theoretical RTP
91.93%
Frequently asked questions
What is the 'Book of' mechanic?
During free spins, a random symbol is chosen to expand and fill its reel when enough instances land. Named after Book of Ra, the original.
Which expanding wild slot has the best RTP?
Legacy of Dead at 96.58% theoretical. But all 'Book of' titles use variable deployment — verify at your casino.
Are expanding wilds the same as walking wilds?
Related but different. Expanding wilds grow vertically to fill a reel on a single spin. Walking wilds persist across multiple spins, moving one reel each spin until they exit the grid.