300SPINS™HARDCORE81 Super Expand
NetGame
81 Super Expand is a ancient civilizations-themed slot by NetGame.
The slot is built on changeable reels with 40 paylines and offers a theoretical maximum win of x2,000.
It also comes with special features such as Hold and Respin and Fixed Jackpot, adding locked-symbol bonus tension and extra jackpot targets alongside regular wins.
Verdict
HARDCOREPlayer Fit Spectrum
Hardcore
CasualBalancedHardcore
Hit rate was below the review-session average.
Top 10% win payout share was below the review-session average.
This session combined different play tendencies in win frequency and payout composition.
About 300SPINS™
Every 300SPINS™ review starts with hands-on play: we manually play each slot, record the results and analyze the session data ourselves. Every test follows the same protocol: 300 paid spins in one continuous session, a fixed base bet, and no bonus buys or optional bet enhancements. Naturally triggered free spins and bonus rounds are included in the results. This consistent setup lets us compare win frequency, payout multipliers and feature activity across games. The analysis describes the recorded session, rather than the game’s complete long-term payout behavior.
Session Results
Session Results
86.67%
Below avg.Avg. (97.15%)Above avg.
We compare this session’s total payout as a percentage of total bets with the review-session average. Regardless of whether the result is above or below average, its distance from the average provides a clue to the game’s tendencies.
This session showed a small deviation. This may suggest a tendency for session results to cluster around the average.
About Session Results
This interpretation is based on one 300-spin observation compared with review sessions recorded using the same method. Three hundred spins cannot establish a game’s overall tendencies or theoretical probabilities. The displayed percentage is total payout divided by total bets, not net profit.
Specifications
Characteristic
HARDCORE
User Rating
No ratings
Free Spin
None
Jackpot
Fixed
Reel Config
Changeable
Paylines
40 Lines
RTP
96.23%
Volatility
-
Max Win
2,000x
Bonus Buy
-
Demo Play
Slots with Similar Characteristics
FeatureMatch™
Symbol changes and separate prizes stand out
The feature structure places particular emphasis on symbol changes and separate prizes. Special-purpose symbols contribute to changes in how combinations are formed. The jackpot family accounts for a separate reward route within the profile.
Feature richness
With numerous special features in its structure, this game has a broad mechanical repertoire spanning more individual systems.
- Feature mechanics
- 10
- Feature families
- 7
Feature profile
Select a role to explore its contributing features.
Number of features contributing to each role. One feature can contribute to several roles.
How we analyze this game’s features
Each bar counts the features that contribute to a functional role. One feature can contribute to more than one role. Bar lengths are scaled to the largest count within this game; compare the numbers when looking across games.
These counts describe feature composition. They are not win probabilities, payout contributions, or quality ratings.
All features 10
Balance Chart: 300SPINS™ Review
Balance Timeline
300 Paid Spins300SPINS balance time-series chart for 81 Super Expand. The chart starts at 996, ends at 836, and bottoms at 836 on spin 300. Free spin trigger markers appear on spin .
300SPINS balance timelineSPIN 0Balance 996
Hit Rate Analysis: 300SPINS™ Review
Play Rhythm
Hit rate was below the review-session average. Profit hit rate was near the review-session average.
Rhythm Comparison
Hit Rate 14.0% / AVG. 26.3%. Profit Hit Rate 10.0% / AVG. 10.6%
Hit Rate
14.0%
Profit Hit Rate
10.0%
Observation Map
Hit Rate
Profit Hit Rate
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PREVIEW
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PREVIEWThree Civilizations: Bonus Combo
Hold and RespinSymbol Upgrade
- Reel Config
- Changeable
- RTP
- 96.23%
- Paylines
- 40
PREVIEWRapid Strike: Rapid Link
Hold and RespinSymbol Transformation Wild
- Reel Config
- Changeable
- RTP
- 96.23%
- Paylines
- 50
Payout Analysis: 300SPINS™ Review
Payout Profile
The maximum win multiplier was below the comparison average, but the average multiplier among winning spins was above average.
Payout Comparison
Max Multiplier 54.0x / AVG. 96.3x. Average Win Multiplier 6.19x / AVG. 4.44x
Max Multiplier
54.0x
Average Win Multiplier
6.19x
Observation Map
Max Multiplier
Average Win Multiplier
Dependency Analysis
This game has no free-spin feature. We examine how much of the payout from regular play was concentrated in a few large wins. Top 10% win payout share was below the review-session average. The largest 5 of 42 winning records supplied 47.7% of total payout.
- Free Spin Dependency
- N/A
- Big Win Dependency
- 47.7%
Highlight Features
Hold and Respin
Hold and Respin, or 'Hold & Win', is one of the most popular core bonus game mechanics in modern slots. The essence of this feature, unlike traditional free spins, is to 'Hold' bonus symbols on the reels and 'Respin' the remaining empty spaces to fill up the screen. This system was popularized worldwide through 'Money Train 2's' 'Money Cart Bonus' and is the foundation for numerous developer-specific brand features like Wazdan's 'Hold the Jackpot™' and Playtech's 'Fire Blaze™'.
Symbol Upgrade
Symbol Upgrade is a powerful feature that progressively converts low-value symbols on the reels into higher-value ones as the game proceeds. The core of this feature is not just a one-time symbol change, but a 'growth' structure where lower-tier symbols are permanently removed from the reels and replaced by higher-tier ones. This drastically increases the average expected payout of the reels towards the end of the round.
Gallery
User Rating
Community Score
No ratings
Based on 0 community ratings. User ratings are shown separately from our 300SPINS™ session data.
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About 300SPINS™ Reviews
Every 300SPINS™ review starts with hands-on play: we manually play each slot, record the results and analyze the session data ourselves. Every test follows the same protocol: 300 paid spins in one continuous session, a fixed base bet, and no bonus buys or optional bet enhancements. Naturally triggered free spins and bonus rounds are included in the results. This consistent setup lets us compare win frequency, payout multipliers and feature activity across games. The analysis describes the recorded session, rather than the game’s complete long-term payout behavior.