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We evaluate slot machines based on multiple criteria, from which we make our final verdict.
Design and theme
70 %
Features and playability
70 %
RTP and volatility
96 %
Slot machine details and review 777 Volt GigaBlox
777 Volt GigaBlox is a release from Yggdrasil Gaming, and a slot machine that can deliver exciting features, along with decent prizes. It’s a classic if we go by the symbols chosen (Sevens, in particular), though the quality is fairly high. Its game area presents us with 6×4 reels to spin, along with the 25 active paylines where combinations will form.
Every slot machine must be developed by a company that invented, designed and put it into operation. Many players eventually find that they only enjoy playing on machines from specific software provider, so they narrow down their selection by preferred brand.
A slot with medium volatility. Wins are less frequent, but more often of higher value. The game is less stable and you can expect longer periods without winning, suitable for players who can tolerate higher risk and are more after bigger wins. More about volatility here.
Slot theme and symbols
You shouldn’t expect a unique story from 777 Volt GigaBlox, but that doesn’t mean it’s a bad-looking game. Yggdrasil’s slot was designed with modern-looking symbols, even though they’re going to feature Royals and various Sevens for the most part. The Gigablox symbols, which take over multiple reels at a time, certainly make an impression as well. A total of 8 regular symbols are available, with 4 of those being of high value and coming in golden versions as well.
777 Volt GigaBlox theme and symbols
The resulting math for 777 Volt GigaBlox is fine, but not among the best options around, if you care about the long-term numbers. For starters, the RTP range only goes up to 94%, so long-term it pays less than most online slots it competes with (96% or higher is expected). Second, volatility is medium to high, so you do risk a fair amount while playing it, at least that’s the expectation. The 5,000x top jackpot prize is alright, but it’s not going to win the competition against plenty of other slots.
Golden 777 Volt
Golden 777
Golden 77
Golden 7
777 Volt
Purple 777
Green 77
Blue 7
Letter A
Letter K
Letter Q
Letter J
Special Symbols and Slot Features
3D
NO
Autoplay
YES
Free Spins
YES
Gamble Feature
NO
Locking Symbols
NO
Wild Symbol
YES
Win Multiplier
YES
Other features
Bonus buy
Other Features
Scatter Symbol
WILD symbol
Wild symbols are going to show up on the reels, ready to be used either for their own combinations or as replacements for other symbols that can use their help.
GigaBlox
The Gigablox mechanic is guaranteed each round, and it will influence 2 to 6 reels, which will be connected and will show up to 4×4 symbols.
The Diamond feature
The Diamond is a special symbol that can only show up on reel 5. Whether it’s fully visible or not, the result is the same. It will give you either a prize of up to 500x or 5 to 16 free spins. If you’re already in the free spins mode, then you get a cash prize or up to 5 extra spins.
Scatter symbol
The Golden Vault Door is the scatter symbol, and it will appear on all reels.
Free Spins
If you can get 5+ scatter symbols to land, then you get 1 free spin from each triggering symbol. There will also be 3 to 7 features available in this feature, and they come from your picks:
Wild High: turns a high-value symbol into a wild.
Multiplier X2: a 2x multiplier that applies to all wins.
Expanded Reels: you play on 6×6 reels (2 rows are added).
Extra Wild: each round, you get 1-2 wilds added to the reels.
High Stack: turns one of the high-value symbols into a stacked symbol.
Extra Free Spins: adds up to 5 extra free spins.
Golden Bet
If you decide to use the Golden Bet option, you will be spending an additional 20% per spin, but it will give you 1 extra feature pick when the free spins trigger.
Buy Free Spins
Two different options are available if you hit the Buy Bonus button. You can pay to get 5 to 16 free spins with either 3 to 7 features or 4 to 8 features.
Prize table
Symbol
Multiplier
3x in payline
4x in payline
5x in payline
6x in payline
WILD symbol
1.60x
4x
8x
20x
Golden 777 Volt
1.60x
4x
8x
20x
Golden 777
1.60x
4x
8x
20x
Golden 77
1.60x
4x
8x
20x
Golden 7
1.60x
4x
8x
20x
777 Volt
1x
2.40x
6x
12x
Purple 777
0.80x
2x
5x
10x
Green 77
0.80x
1.60x
4x
8x
Blue 7
0.60x
1.20x
3x
6x
Letter A
0.20x
0.40x
1x
2x
Letter K
0.20x
0.40x
1x
2x
Letter Q
0.20x
0.40x
1x
2x
Letter J
0.20x
0.40x
1x
2x
Our rating of the game
777 Volt GigaBlox
There are enough mechanics and features to be had in 777 Volt GigaBlox, so it can be a fun slot to play. I’m OK with the combination of a 5,000x top jackpot in a medium-high volatility slot, but the 94% RTP is a clear downside that will keep plenty of players away. Even the theme, while of high quality, doesn’t deliver anything unique or interesting. Overall, it’s not one of the slots I’d recommend. I expect you will find plenty of other Gigablox slots with better odds.
85%
Editor's rating
Design and theme
80 %
80 %
Features and playability
85 %
85 %
RTP and volatility
94 %
94 %
How do we rate slot machines?
We evaluate slot machines based on multiple criteria, from which we make our final verdict.
Gigablox mechanic that guarantees 2+ reels with large symbols each round.
Wild symbols will help you form more winning combinations, and they also pay directly.
Gets a free spins feature that comes with up to 7 modifiers based on your picks.
The Diamond feature can trigger free spins or pay decent prizes.
A Golden Bet option allows you to play the free spins with an extra feature active.
There is the option to buy access to the free spins feature.
Cons
A maximum RTP of 94% is considered very low for today’s online slots.
Medium to High volatility signals that it’s not a particularly friendly game.
Theme-wise, it has Sevens and Royals on its reels, so it’s not that interesting to look at.
Manufacturer Yggdrasil
Yggdrasil slots are known for their innovative game mechanics and great graphics. Yggdrasil often features themes inspired by mythology and fantasy worlds, making them a very popular slot manufacturer.
First Deposit Only. Game: 777Strike, Spin Value: £0.10, Max Free Spins: 100. Free Spins will not trigger the jackpot, and do not contribute to the jackpot value. WR 10x free spin winnings amount (only Slots count) within 30 days. Max bet is 10% (min £0.10) of the free spin winnings amount or £5 (lowest amount applies). Spins must be used and/or Bonus must be claimed before using deposited funds. Deposit/Welcome Bonus can only be claimed once every 72 hours across all Casinos. Bonuses do not prevent withdrawing deposit balance. Bonus Policy applies.| Gambleaware.org
How do we rate bonuses?
The overall bonus rating is determined based on several factors: the amount of the bonus, the company's rating, the ease of obtaining it, the players' rating and the conditions for obtaining the bonus.
Use the bonus spins offer at PlayOJO to get 50 FS on the Big Bass Bonanza slot. The minimum required deposit to activate the bonus is £10 and your spins can be played at the £0.1 chip size. Note that the bonus is not available for players from N.I. Irregular play may lead to the removal of rewards. Gambleaware.org. All the OJO Rewards and Game Play policies apply.
Bingo Bonus: First deposit only. Deposit £10 or more to claim. 50 free spins on Big Bass Bonanza slot. 500 free bingo tickets when you spend £10 on bingo, valid once per player. Free tickets valid on selected games up to £0.10 each, see bingo rooms for info. Excludes players in N.I. Irregular play may lead to removal of reward. OJO’s Rewards and Game Play policy applies.
How do we rate bonuses?
The overall bonus rating is determined based on several factors: the amount of the bonus, the company's rating, the ease of obtaining it, the players' rating and the conditions for obtaining the bonus.
5 Free Spins – New players only, No deposit required, valid debit card verification required, max bonus conversion £50, 10x wagering requirements,Full T&Cs apply. Up to 500 Free Spins – New players only, £10 min fund, free spins won via mega reel, max bonus conversion to real funds equal to lifetime deposits (up to £250), 10x wagering requirements and full T&Cs apply. Gambleaware.org
How do we rate bonuses?
The overall bonus rating is determined based on several factors: the amount of the bonus, the company's rating, the ease of obtaining it, the players' rating and the conditions for obtaining the bonus.
11 FS – New players only. 18+. Min. deposit £10. Account ballance is withdrawable at any time. Upon withdrawal, any remaining bonus spins are forfeited. 7 days to activate the spins. Bonus spins will expire 24 hours after activation. Full T&C Apply.
£50 deposit bonus – New players only. Min. deposit £10. 30 days to activate & 60 days to use deposit bonus after activation. Wager req.: 10x on eligble games. Max. Bonus £50 . Bonus balance is paid with 10% Increments to account balance. Bonus balance is not payable. Max. bet is £20 or up to value 50% of the bonus amount – whichever is lowest. Account ballance is withdrawable at any time. Upon withdrawal, any remaining deposit bonus is forfeited. Full T&C Apply, play responsibly. Gambleaware.org
How do we rate bonuses?
The overall bonus rating is determined based on several factors: the amount of the bonus, the company's rating, the ease of obtaining it, the players' rating and the conditions for obtaining the bonus.
18+. New players only. Sign up, deposit and stake £20 on selected slots, and receive 100 Free Spins on Fishin’ Frenzy Even Bigger Fish. 30 day free spins expiry. Ends 14/02/26 at 23:59 GMT. Full T&Cs Apply. begambleaware.org.
How do we rate bonuses?
The overall bonus rating is determined based on several factors: the amount of the bonus, the company's rating, the ease of obtaining it, the players' rating and the conditions for obtaining the bonus.
Total bonus amount
92 %
Easy to reach
94 %
Bonus conditions
92 %
Casino rating
90 %
Warning: Play and gamble responsibly | Gambling may be addictive 18+ | Underage gambling is an offence | When the fun stops, stop.
I am a writer who specializes in slot machines. I've been writing about them since 2013 and have reviewed thousands of slot machines over the years. I continue to cover the industry and review new releases for Bonusmenu. When I'm off the clock, you'll find me buried in a book or wandering the virtual wastelands of Fallout and the provinces of The Elder Scrolls.
First Deposit Only. Game: 777Strike, Spin Value: £0.10, Max Free Spins: 100. Free Spins will not trigger the jackpot, and do not contribute to the jackpot value. WR 10x free spin winnings amount (only Slots count) within 30 days. Max bet is 10% (min £0.10) of the free spin winnings amount or £5 (lowest amount applies). Spins must be used and/or Bonus must be claimed before using deposited funds. Deposit/Welcome Bonus can only be claimed once every 72 hours across all Casinos. Bonuses do not prevent withdrawing deposit balance. Bonus Policy applies.| Gambleaware.org
Deposit at least £10 and Get 50 FS on the famous Big Bass Bonanza slot
94%
+ 500 free bingo tickets when you spend £10 on bingo
Use the bonus spins offer at PlayOJO to get 50 FS on the Big Bass Bonanza slot. The minimum required deposit to activate the bonus is £10 and your spins can be played at the £0.1 chip size. Note that the bonus is not available for players from N.I. Irregular play may lead to the removal of rewards. Gambleaware.org. All the OJO Rewards and Game Play policies apply.
Bingo Bonus: First deposit only. Deposit £10 or more to claim. 50 free spins on Big Bass Bonanza slot. 500 free bingo tickets when you spend £10 on bingo, valid once per player. Free tickets valid on selected games up to £0.10 each, see bingo rooms for info. Excludes players in N.I. Irregular play may lead to removal of reward. OJO’s Rewards and Game Play policy applies.
5 No-deposit Free Spins on Aztec Gems Slot
94%
+ Chance to win up to 500 Free Spins on Big Bass Splash and other prizes
5 Free Spins – New players only, No deposit required, valid debit card verification required, max bonus conversion £50, 10x wagering requirements,Full T&Cs apply. Up to 500 Free Spins – New players only, £10 min fund, free spins won via mega reel, max bonus conversion to real funds equal to lifetime deposits (up to £250), 10x wagering requirements and full T&Cs apply. Gambleaware.org
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Software provider
Game typeSlot
Reels6 Reels
Winning paylines25 paylines
