Evoplay launched The Castle of Slotenstein on October 15, introducing a Frankenstein-inspired on-line slot constructed round a three-booster Hold & Win bonus and a Grand Reel of Fortune finale.
The sport takes place in a fictional mad scientist’s fortress, the place gamers encounter a towering monster and three colored pumpkin Bonus symbols that decide which boosters grow to be out there through the bonus spherical. The launch continues Evoplay’s use of seasonal themes alongside layered bonus mechanics, following earlier releases constructed round related programs throughout 2026.
The Castle of Slotenstein makes use of three boosters, named Shock, Trick and Treat, to affect the event of its bonus characteristic. Players can activate the boosters by means of the corresponding colored Bonus symbols in the principle sport, with the out there mixture figuring out how the Hold & Win spherical begins.
‘The Castle of Slotenstein provides the traditional Frankenstein story an Evoplay twist, combining a spooky Halloween setting with a characteristic set designed to maintain the motion constructing. The three boosters every change the way in which the Bonus Game develops, whereas the Grand Reel of Fortune provides gamers a goal to chase as they work by means of the characteristic,” Ivan Kravchuk, CEO at Evoplay, stated in line with European Gaming News.
Three Boosters Shape the Hold & Win Feature
The slot’s foremost sport introduces the symbols that decide the bonus spherical’s beginning circumstances. Green, purple and blue pumpkin Bonus symbols correspond to Shock, Trick and Treat, respectively. Depending on which symbols seem through the triggering spin, the Bonus Game can start with one, two or all three boosters energetic.
The Green Shock booster will increase the preliminary quantity of bonus spins from three to 4. This supplies a further spin in the beginning of the characteristic.
Purple Trick modifications how Bonus symbols seem and work together with each other. During the bonus spherical, the booster permits Purple Bonus symbols to fill empty positions on their reel and enhance the values of present Orange Bonus symbols on that reel. Purple Bonus symbols can carry values starting from 0.5x to 5x the participant’s wager.
The Blue Treat booster additionally introduces further worth to the bonus spherical. Blue Bonus symbols carry values from 0.5x to 5x the wager, that are added to each Orange Bonus image on the sport subject when the booster is energetic.
Orange Bonus symbols seem solely through the Bonus Game and award random values starting from 0.5x to 5x the wager. Only Bonus symbols seem on the reels throughout this characteristic, and every newly landed Bonus image resets the remaining spin counter. This mechanism permits the spherical to proceed as new symbols arrive, creating additional alternatives to fill particular person reels.
The sport additionally features a Wild image in the principle sport. It substitutes for normal symbols in profitable combos, excluding Bonus symbols, and seems solely on reels two by means of 5.
Grand Reel of Fortune Adds a Final Prize Round
The central development mechanic comes into play when gamers fill a reel with three Bonus symbols. Once all three positions on a reel comprise Bonus symbols, the sport collects their displayed values and provides them to the win meter. The accomplished reel is then cleared, making its positions out there for subsequent Bonus symbols.
The first time every reel is accomplished through the Bonus Game, the corresponding part of the Grand Reel of Fortune turns into unlocked. The characteristic comprises 5 sections, and gamers should unlock all of them to activate the ultimate prize spherical.
After all 5 sections have been unlocked, the sport awards one last spin on the Grand Reel of Fortune on the finish of the Bonus Game. The wheel can produce one of eight outcomes: multipliers of 2x, 3x, 5x or 8x, or one of 4 fastened prize classes named Mini, Mega, Super and Grand.
The Grand Reel of Fortune is obtainable solely through the Bonus Game, linking its last spin to progress made on the reels. Completing every reel for the primary time contributes to unlocking the wheel, whereas the collected Bonus image values feed into the win meter.
This construction provides the characteristic two related parts: amassing values from accomplished reels and unlocking the sections required to achieve the ultimate prize spin.
Bonus Buy Offers Direct Entry
The Castle of Slotenstein additionally features a Bonus Buy choice, permitting gamers to buy speedy entry to the Bonus Game reasonably than ready for the characteristic to set off by means of common play.
The choice supplies a selection of getting into with one, two or all three boosters energetic. This lets gamers choose the beginning configuration for the bonus spherical, together with combos that activate Shock, Trick and Treat collectively.
Evoplay has used booster mechanics in different releases throughout 2026, together with 3 Super Volcanoes and Tiger of Fortune, in addition to titles related to Oktoberfest and Asian mythology. The new Halloween sport applies an analogous method to a monster-themed setting, with the colored pumpkins serving because the hyperlink between the principle sport and the bonus characteristic.
The online slot‘s motion takes place on a grid with 5 reels and three rows, that includes 20 paylines. According to the developer, the title is constructed utilizing HTML5 know-how and helps Full HD decision in a 16:9 format. It has a said return to participant (RTP) of 96.20% and low volatility.
The launch provides one other seasonal title to Evoplay’s portfolio, with the Frankenstein setting offering the backdrop for a bonus system based mostly on colored symbols, reel completion and a last wheel-based prize.
