The Castle of Slotenstein

The game The Castle of Slotenstein by Evoplay is a video slot designed with a layout of 5 reels and 3 rows, featuring 20 fixed paylines, surrounded by a dark theme inspired by the castle of mad scientists and glowing pumpkins. In the base game, you will encounter regular symbols depicting gothic tools and creatures, while the Wild symbol (in the style of Frankenstein) appears on reels two to five to help complete winning lines.

In the base game, there are three special colored Bonus Pumpkin symbols—Green "Shock," Purple "Trick," and Blue "Treat." Landing one to three of these symbols can trigger a bonus round; four or more guarantee entry. Each of the three types of pumpkins activates a different booster during the bonus round: Shock increases the number of respins from three to four, Trick allows purple pumpkins to appear, increasing existing orange values in their column and filling empty spaces before turning into orange, while Treat adds its value to all orange bonus symbols across the grid.

When the bonus game starts, only bonus symbols remain on the reels, with new symbols resetting the respin counter. Orange bonus symbols carry random values ranging from 0.5× to 5× your bet. Completing all symbols in a column collects their value in your win meter and clears that column to be refilled, while also unlocking one of five locks around the Great Wheel of Fortune. Once all columns are filled at least once during the bonus, you gain a spin on the Great Wheel of Fortune, which can award multipliers (2×, 3×, 5×, or 8×) or fixed prizes called Mini, Mega, Super, or Grand.

The game also offers a bonus buy option, allowing players to skip directly to the bonus game. With the bonus buy, you can enter with one, two, or all three boosters already activated, at costs displayed in your chosen currency.

The Castle of Slotenstein has high volatility and a low number of features that are heavily focused on increasing value through its plastic boosters, collection mechanics, and the finale of the Great Wheel—less about frequent wins in the base game and more about building towards bonus rounds.

You can try it for free in demo mode or play it for real money.