NetGaming does not officially stamp expanding symbols as one neat branded series, yet the pattern is too clear to miss. Across several of its strongest releases, the studio keeps returning to the same core thrill: a symbol lands, grows across a reel, rewrites the shape of the spin, and suddenly a modest setup turns into something much heavier. That mechanic suits NetGaming’s style perfectly. The developer tends to prefer compact maths models, direct feature triggers and bonus rounds that do not waste time. In these games, expanding symbols are not decoration. They are the engine that changes pace, pressure and payout potential in a single movement.
What makes this branch of the catalogue at Wildies worth separate attention is the way NetGaming uses expansion in several different moods. Sometimes it is a classic full-reel wild attached to a small three-reel format. Sometimes it appears only inside free spins, where one chosen symbol can suddenly flood whole reels and pay in ways the base game never could. In later titles the idea becomes broader still, feeding jackpot picks, bonus ladders or guaranteed wild rounds. The studio clearly understands that expansion works best when it is not isolated. It needs either a multiplier, a retrigger path, or a second mechanic waiting beside it. That is why the best NetGaming expanding symbol slots feel sharper than many similar games from rival studios. They do not stop at one flourish. They build a chain reaction around it.
3 Wild Jokers and the old-school blueprint that still works
Released on 10 February 2022, 3 Wild Jokers remains one of the clearest examples of NetGaming taking a bare-bones slot frame and giving it real bite. It runs on a 3x3 layout with 5 fixed lines, carries high volatility, returns 94.43 per cent RTP in the standard game and 94.69 per cent through the buy option, and offers a maximum win of 1,383x bet. The plot is simple and unapologetically old-school, built around jokers, classic fruit-slot logic and the familiar idea that a small machine can still hit harder than expected. That simplicity is exactly why the feature set lands so well. The game does not bury its strongest ideas under clutter.
Its three wild functions map the whole design. A Wild Joker on reel one awards a mystery cash prize, which gives the first reel a pure instant-reward role. A Wild Joker on reel two becomes the central attraction, expanding to cover the entire reel and sharply increasing line coverage. A Wild Joker on reel three applies a 3x multiplier to all wins. If two or three jokers land together, those effects combine, which is where the game starts punching above its tiny grid. Super Spins are triggered when at least one wild is visible, and three wilds guarantee entry. During those three bonus spins, at least one wild is guaranteed to appear on each spin, while further wilds can land naturally. The Buy Bonus costs 50x the total stake and sends the game straight into Super Spins. For a small-format slot, it has surprising mechanical density, and the expanding reel on the second position is the move that holds the whole thing together.
3 Wild Sevens takes the same skeleton and turns up the voltage
3 Wild Sevens followed on 20 February 2025 and looks, at first glance, like a close cousin of 3 Wild Jokers. In broad mechanical terms, it is. It also uses a 3x3 layout with 5 lines, high volatility, 94.43 per cent RTP in the base game, 94.69 per cent via Buy Bonus, and a Super Spins feature built around visible wilds. Yet the top win jumps to 138,300x bet, which changes the tone completely. The plot leans into classic casino iconography and sevens rather than joker chaos, but the real shift is in the ambition of the maths. This is still a compact three-reel title, only now it behaves like a much more aggressive one.
The feature logic stays beautifully clean. A wild on reel one unlocks a mystery reward. A wild on reel two expands across the full reel before wins are evaluated. A wild on reel three applies a 3x multiplier. When multiple wilds land together, their powers stack, and that combination is exactly why the top ceiling is so much larger than the base layout suggests. Super Spins award three rapid bonus rounds whenever at least one wild is present, and the review notes a hit frequency of 10.99 per cent, which underlines the slot’s sharper risk profile. The Buy Bonus guarantees entry into Super Spins, keeping the entire design tightly centred on the wild system. In effect, 3 Wild Sevens proves that expanding symbols do not need a huge board or elaborate story structure to feel dangerous. They only need the right partners beside them.
Master of Fortune shows how expanding reels can drive a more traditional five-reel slot
Released on 3 February 2020, Master of Fortune belongs to an earlier NetGaming phase, yet it still reads as one of the developer’s key expanding-symbol games. It uses a 5x3 reel set with 27 lines, high volatility, a 95.82 per cent RTP and a maximum win of 2,222.22x bet. The plot circles around luck, prosperity and a figure who stands as a guide to fortune in an East Asian setting. Unlike the sharp little three-reel titles, this one works with a broader frame and more standard slot pacing, which makes its expansion mechanic feel less explosive but more foundational.
Three or more bonus symbols trigger 12 free spins, and that is where the slot begins to stretch properly. In the base game, wilds appear on reels one, three and five, substitute for regular symbols and expand to fill the whole reel when triggered. A wild that contributes to a win applies a 3x multiplier. The review adds an important detail for the free-spin phase, where the multiplier climbs to 3x, 5x or 7x depending on how many wild symbols are involved. That means expansion is never working alone. It is always tied to amplified value, and the combination of reel-filling wilds with rising multipliers gives the game a clean sense of escalation. Master of Fortune is not the loudest title in this category, but it is one of the more disciplined ones. It knows exactly what its expanding symbols are there to do and keeps every other system pointed towards that purpose.
Mystic Ocean turns expanding symbols into the whole identity of the bonus round
Mystic Ocean, released on 31 August 2020, takes a different route. Rather than using expanding wilds as a constant presence, it saves the main expansion drama for free spins. The official page lists a 5x3 layout, high volatility, a 96.50 per cent RTP and a maximum win of 5,514x bet. Its plot heads underwater, using sea life, protective myth and hidden treasure as the narrative shell, but the real heart of the game is the bonus structure. Three or more bonus symbols award 10 fixed free spins, and the bonus symbol also acts as a wild outside the special expanding phase.
What makes Mystic Ocean memorable is the chosen-symbol system. At the start of free spins, one of nine ordinary symbols is selected as the special expanding symbol. When that symbol lands anywhere during the feature, it expands to cover the entire reel and pays on all active lines, even on non-adjacent positions. If three or more bonus symbols appear during free spins, another 10 spins are added, and the same chosen symbol remains in place. That creates a rare kind of continuity. The game does not reset the central rule each time the feature grows longer. It keeps the same expansion identity and lets the round build around it. There is also a gamble feature that can double a completed win up to four times through a card choice, but the expanding-symbol free-spin round remains the defining element. Mystic Ocean is less about chaos and more about concentration. Once the chosen symbol starts dropping in the right places, the entire board begins to behave differently.
Fortune Gold Prosperity gives expanding wilds a jackpot economy of their own
By the time Fortune Gold Prosperity launched on 29 May 2025, NetGaming was clearly treating expansion as something that could anchor a much larger structure. This 5x3 slot carries high volatility, an RTP range of 94.26 to 94.29 per cent, and an official maximum win of €250,000 rather than a simple x-bet cap. Its plot is rooted in prosperity, gold and symbolic wealth, but the real story sits in the Golden Tree mechanic. Wilds do not merely substitute. In the base game they can randomly expand to fill an entire reel, and every wild also adds a golden leaf to the tree, giving the feature logic a sense of accumulation rather than isolated impact.
The bonus layer is where the game separates itself from simpler expanding-wild slots. Three or more Gong scatters trigger Prosperity Spins, but the player is not dumped into one default package. Instead, the game offers 15 spins on 3 rows, 10 spins on 4 rows, 5 spins on 5 rows, or a mystery option. During these spins, expanding wilds are guaranteed when they appear, and three or more gongs can retrigger three extra spins. On top of that sits Prosperity Picks, triggered by one or more Golden Tree wilds in either the base game or the bonus. This leads to a 12-coin pick round that continues until three matching jackpots are found. The jackpot levels are Mini at 8x, Minor at 18x, Major at 88x and Grand at 888x, and a multiplier can appear before the third match to enhance the final reward. The Buy Bonus grants direct entry to Prosperity Spins for 60x bet, while Boost Bet increases the chance of triggering both the free-spin mode and Prosperity Picks. Here, expanding symbols are not just a reel event. They are the hinge connecting free spins, jackpots and multipliers into one interlocked system.