The Castle of Slotenstein Opens a Three-Booster Hold & Win
The Castle of Slotenstein leads into a spooky laboratory where three glowing pumpkins — Shock, Trick and Treat — control the main bonus mechanics. Colored Bonus symbols determine which boosters enter the round, while full reels are repeatedly cleared to unlock sections of the Grand Reel of Fortune.
The Castle of Slotenstein Game Details
| Category | Details |
| Provider | Evoplay |
| Release Date | October 2026 |
| Theme | Halloween / Spooky |
| Game Type | Video Slot |
| Reels & Rows | 5×3 |
| Paylines | 20 |
| RTP | 96.20% |
| Hit Frequency | 20.82% |
| Bonus Game Frequency | 1 in 90 |
| Bet Range | €0.10–€75.00 |
| Max Win | 3,127.5x bet / €234,562.50 |
| Key Features | Shock, Trick & Treat Boosters, Bonus Game, Grand Reel of Fortune, Bonus Buy |
The Castle of Slotenstein Base GameplayWild Symbol and Three Colored Boosters
The Wild substitutes for all regular symbols in winning combinations except Bonus symbols. It can appear on reels 2–5 during the main game.
Green, Purple and Blue Bonus symbols can land on any reel. Each color is tied to one of the three pumpkin boosters:
- Green Bonus – Shock
- Purple Bonus – Trick
- Blue Bonus – Treat
The boosters active in the Bonus Game are determined by the colors present when the feature is triggered.
The Castle of Slotenstein Three BoostersShock Adds an Extra Bonus Spin
The Shock Booster increases the starting number of Bonus Game spins from 3 to 4.
This gives the feature an additional opportunity to land Bonus symbols, reset the counter and progress toward unlocking the Grand Reel of Fortune.
The Castle of Slotenstein Shock BoosterTrick Increases Values Reel by Reel
The Trick Booster allows Purple Bonus symbols carrying values from 0.5x to 5x bet to appear during the Bonus Game.
A Purple Bonus fills an empty position and increases the values of Orange Bonus symbols located on the same reel.
The Castle of Slotenstein Trick BoosterTreat Boosts Orange Bonuses Across the Grid
The Treat Booster introduces Blue Bonus symbols worth 0.5x to 5x bet.
Each Blue Bonus adds its value to all Orange Bonus symbols on the game field, allowing several existing prizes to increase simultaneously.
The Castle of Slotenstein Treat BoosterBonus Game Clears Full Reels
The Bonus Game can begin with one, two or all three boosters active. It starts with 3 spins, or 4 spins when Shock is active, and only Bonus symbols can appear.
Every new Bonus symbol resets the remaining spin counter.
Orange Bonus symbols award random values from 0.5x to 5x bet. When all 3 positions on a reel become occupied by Bonus symbols, their displayed values are added to the win meter. The reel is then cleared and becomes available for new symbols again.
The Castle of Slotenstein Orange Bonus SymbolsThe first time a full reel is cleared, its corresponding section of the Grand Reel of Fortune is unlocked.
Grand Reel of Fortune
Unlocking all 5 sections activates the Grand Reel of Fortune at the end of the Bonus Game.
One spin then awards one of eight possible prizes:
x2, x3, x5, x8, MINI, MEGA, SUPER or GRAND.
The Castle of Slotenstein Grand Reel of FortuneBonus Buy also provides direct access to the Bonus Game with one, two or all three boosters active.
The Castle of Slotenstein Turns Full Reels into Bonus Progress
The Castle of Slotenstein builds its bonus around a repeating cycle of filling and clearing reels. Shock extends the starting round, Trick strengthens Orange Bonuses reel by reel, and Treat raises their values across the entire field.
Those three boosters ultimately feed the same objective: clearing all five reels at least once to unlock the Grand Reel of Fortune and its final multiplier or special prize.
