777 Super BIG BuildUp II Double Deluxe Slot Review
A magenta grid floor runs to the horizon under a synthwave skyline, tower blocks stacked in purple and electric blue behind the reels. 777 Super BIG BuildUp II Double Deluxe, from Crazy Tooth Studio, is the loudest game imaginable wearing some of the politest maths you’ll meet – a slot that dresses like an 80s arcade and behaves like a patient construction set.
It runs at 96.22% RTP on medium volatility, with five reels in a 3-4-4-4-3 arrangement and 576 ways to win, with stakes from 0.15 to 37.5.
It follows on from 777 Super Big BuildUp Deluxe, and sits in the studio’s 777 line alongside 777 Rainbow Respins and 777 Smash. The look is loud; the maths is steady.
Base Game & Features
The gameboard is an odd shape. Reels 1 and 5 carry three symbol rows, while the middle three carry four apiece, and wins are evaluated across 576 ways rather than fixed paylines.
Stakes run from 0.15 up to 37.5 per spin, and your bet multiplier is the credits played divided by 0.15. A 0.30 credit spin therefore carries a multiplier of two, and every payout table shows credit values for that multiplier.
Any Adjacent Pays
Winning combinations can be anywhere on the reels. Three or more matching symbols on adjacent reels along a way make a winning combination, and only the highest win per way is paid.
Way wins and credit awards are both multiplied by the bet multiplier of the winning game. That’s the whole of the arithmetic: the bet multiplier feeds everything, from the paytable values to the feature and bonus awards further in.
The practical effect is that symbols don’t need to line up from the leftmost reel, which is the convention on most ways-based games. A cluster of matching symbols sitting across the middle three reels pays just the same.
Matching symbols do have to sit next to each other on a way, so an unbroken run along adjacent reels is still the whole of the job. Reel gaps break the combination.
Symbols
The wild substitutes for all paying symbols but never for scatters. Beyond the regular paying set, the game carries four passive symbols that pay nothing themselves but feed the features instead:
- Chip – appears on reels 1, 2, 4 and 5 in the base game
- Coin – base game only, on reels 1, 3, 4 and 5
- Diamond – reels 1, 2, 4 and 5 in the base game
- Triple Seven – base game only, on reel 3 exclusively
Scatters appear only in the base game. That matters here, because the bonus can’t be retriggered, so the scatter has no work to do once the feature is underway.
The Triple Seven is the quirkiest of the passive set – a single reel, reel 3, is its whole territory. It never appears alongside the Chip or the Diamond, which skip that reel entirely, so the centre column belongs to the Triple Seven and the Coin alone.
The reel assignments aren’t decoration, either. Because the Coin skips reel 2 and the Chip skips reel 3, no single spin can stack all four passive symbols across the board – each feature’s raw material arrives from a different corner of the game.
777 Super BIG BuildUp II Double Deluxe Bonus Spins & Double Deluxe Feature
Double Deluxe Feature
There’s no trigger to look for on this one. The Double Deluxe Feature can arrive unannounced on any spin, and when it does the passive symbols each cash in what they’ve been collecting:
- Double Deluxe Prize – a direct award that may accompany the feature
- Chips – award wild symbols, each adding a symbol position to its reel
- Coins – award multipliers of 2x, 3x, 4x or 5x
- Diamonds – duplicate one or more reels
The duplication is the distinctive part. When a Diamond fires, an additional reel is inserted into the gameboard next to the original and populated with the same symbols, so the board physically grows mid-feature.
Multipliers work two ways. Paired with the Double Deluxe Prize, they boost that prize alone; landing without it, they boost every ways win evaluated during the feature. That distinction decides whether a 5x multiplier is a nice top-up or the difference between a modest feature and a serious one.
The feature runs on the bet multiplier of the triggering spin, credit wins land immediately, and symbol wins pay out once every prize has been revealed and every duplication is complete. Feature wins are added to regular wins.
Double Deluxe Bonus Spins
Three scatters trigger the Double Deluxe Bonus Spins. On every bonus spin, one or more Chips may land and award wild symbols, each of which adds a symbol position to its reel for the rest of the bonus.
Those wilds persist, moving down one position per spin until they drop off the board. That drift is the round’s engine. A wild landed early keeps substituting for spin after spin while slowly descending, so the middle of the bonus is where the accumulated wilds are all still working at once.
Diamonds behave differently here than in the random feature. Each bonus spin, one or more may land on a reel and duplicate it, but the duplicate doesn’t persist to the next spin – it’s a one-spin boost, not a lasting structure.
The bonus can’t be retriggered, and it finishes after the final spin concludes. Wins are governed by the bet multiplier of the triggering game, and the stated win-up-to values come from a whole bonus session’s cumulative winnings rather than a single round.
Our Honest Verdict
Overall Rating: 7.7/10
Playing this is less like spinning and more like watching a build take shape under the neon. Every feature pushes in the same direction – reels grow, wilds stack up and slowly sink, duplicates stack alongside their originals – and the one reason to pick it over the sea of other 777 games is that build: it’s the rare modern slot where the board you finish with is visibly bigger than the one you started on.
The drifting wilds are the best of it. A wild landed on the first bonus spin keeps working for most of the round, so the middle spins are where everything fires together – that’s a genuinely rewarding curve, not just a big number on the last spin.
The worst of it is that the bonus is a sealed room: no retrigger, no scatters once you’re in, so a thin trigger stays thin. Nobody chasing a headline payout will find one here. It’s a fit for players who enjoy steady, medium-volatility maths and a game that rewards patience with structure – the synthwave crowd who like their wins assembled rather than detonated.
777 Super BIG BuildUp II Double Deluxe FAQs
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Can you trigger the Double Deluxe Feature yourself?
No. It arrives randomly on any spin, with no symbol combination or bet condition that sets it off. The passive symbols that feed it – Chips, Coins and Diamonds – can land at any time in the base game. -
What do the multipliers apply to in the Double Deluxe Feature?
It depends on whether the Double Deluxe Prize is awarded. Multipliers landing alongside the prize boost that prize only; multipliers landing without it boost all ways wins evaluated during the feature. -
How do you trigger the Double Deluxe Bonus Spins?
Three scatter symbols in the base game trigger the bonus spins. The scatter only appears in the base game, and the bonus cannot be retriggered. -
Do wild symbols persist during the 777 Super BIG BuildUp II Double Deluxe bonus?
Yes. Wilds awarded by Chips stay on the board, moving down one symbol position each spin until they leave the gameboard. Each wild also adds a symbol position to its reel for the duration of the bonus. -
Do duplicated reels stay in place during the bonus spins?
No. In the Double Deluxe Bonus Spins a duplicated reel lasts for that spin only and doesn’t persist to the next one. In the random Double Deluxe Feature, by contrast, duplications hold until the feature completes. -
What does the Triple Seven symbol do in 777 Super BIG BuildUp II Double Deluxe?
It’s a passive symbol that doesn’t pay. It appears in the base game only, on reel 3 exclusively, and it’s one of four passive symbols – alongside the Chip, Coin and Diamond – that feed the game’s features rather than the paytable. -
What is the RTP of 777 Super BIG BuildUp II Double Deluxe?
The RTP is 96.22%, on medium volatility, with a hit frequency of 27.68%. -
What is the minimum and maximum bet on 777 Super BIG BuildUp II Double Deluxe?
Stakes run from 0.15 to 37.5 per spin, across 576 ways on a 3, 4, 4, 4, 3 reel arrangement.
