What is the RTP of The Castle of Slotenstein?

The rules list 96.20% for normal play, 96.35% for the Bonus Game with 1-3 boosters buy and 96.24% for the Bonus Game with all 3 boosters buy.

How do you trigger the Bonus Game?

Green, Purple or Blue Bonus symbols can land on any reel. One to three of them may trigger the Bonus Game, and four or more guarantee it. The colours on the triggering spin decide which boosters are active.

What do Shock, Trick and Treat do?

Shock raises the Bonus Game spins from 3 to 4. Trick adds Purple Bonus symbols that boost or fill their own reel. Treat adds Blue Bonus symbols whose value is added to every Orange Bonus on the grid.

How much does the Bonus Buy cost?

The 1-3 random boosters option costs 48x the total bet and the all 3 boosters option costs 96x.

What can the Grand Reel of Fortune award?

One spin, after unlocking all 5 sections in the Bonus Game. Prizes are x2, x3, x5 or x8 on the bonus win, or MINI 50x, MEGA 150x, SUPER 500x or GRAND 3000x the bet added to it.

Can I play The Castle of Slotenstein for free in Canada?

Yes. The The Castle of Slotenstein demo on CasinoDemo is free, needs no sign-up and uses virtual credits only.

The Castle of Slotenstein Guide: Rules, Three Boosters, Grand Reel of Fortune and Bonus Buy

The Castle of Slotenstein slot by Evoplay

By the CasinoDemo editorial team · Updated 2026-11-09 · How we review

The Castle of Slotenstein is an Evoplay Halloween slot with a 3 Pumpkins subtitle on its logo. The base game is a plain 5x3, 20-line slot. The real action is a hold-and-win style Bonus Game where three coloured pumpkins, called Shock, Trick and Treat, act as boosters, and a Grand Reel of Fortune can multiply or top up the whole bonus.

We played the free demo, read the paytable and every rules page, and bought both Bonus Buy options. Every number below comes from the game's own screens or from what happened on our reels.

Play The Castle of Slotenstein demo for free

The Castle of Slotenstein at a glance

Provider: Evoplay
Demo: Free, no sign-up

How the base game works

The game is a 5-reel, 3-row video slot with 20 fixed paylines. Wins pay for identical symbols in sequence from the leftmost reel, and only the highest win per line is paid. A line win is the paytable coefficient multiplied by the bet.

There are 9 regular symbols. The top portrait symbol pays 15x, 6x and 3x the bet for five, four and three of a kind. The crow pays 10x, 5x and 2x, the brain 8x, 3x and 1.5x, and the syringe and the skull book both pay 5x, 2x and 1x. The four card royals (A, K, Q, J) all pay 2x, 1x and 0.5x.

The green monster head is the Wild. It replaces all regular symbols but not Bonus symbols, and in the main game it only lands on reels 2 to 5. Those base pays are modest, so most of the game's value sits in the Bonus Game.

The Castle of Slotenstein base game showing the 5x3 reels, Shock Trick Treat pumpkins and the Grand, Super, Mega and Mini prize panel — The base game at a 10.00 demo bet, with the four prize values on the left.

The Castle of Slotenstein paytable with symbol payouts and the Wild rules — The in-game paytable.

Bonus symbols and the three boosters

Green, Purple and Blue Bonus pumpkins can land on any reel in the main game. They carry no values. Each colour is linked to a booster: Green is Shock, Purple is Trick and Blue is Treat. Landing 1, 2 or 3 of them may trigger the Bonus Game, and 4 or more guarantees it. The colours present on the triggering spin decide which boosters are active, so you can get one, two or all three.

Shock raises the Bonus Game from 3 spins to 4. Trick lets Purple Bonus symbols worth 0.5x to 5x the bet land during the feature. A Purple can add its value to every Orange Bonus on its reel, fill all empty spots on that reel with Orange Bonus symbols of the same value, or do both. Treat lets Blue Bonus symbols worth 0.5x to 5x land, and a Blue adds its value to every Orange Bonus on the whole grid. Only one Purple and one Blue can land per reel.

Orange Bonus symbols only appear in the Bonus Game and hold 0.5x, 1x, 1.5x, 2x, 2.5x, 3x, 4x or 5x the total bet.

The Castle of Slotenstein Bonus Game intro screen with only the Trick booster active — Our first buy came with the Trick booster only.

The Bonus Game

When the Bonus Game starts, the coloured pumpkins turn into Orange Bonus symbols with random values, and every reel without a Bonus symbol gets one Orange Bonus. The reels switch to special strips that hold only Bonus symbols and blanks. You start with 3 spins (4 with Shock), and every new Bonus symbol resets the count.

This is not a classic hold-until-full grid. Symbols stay put until the feature ends or their reel fills all 3 positions. When a reel fills, its values go to the win meter and the reel clears so new symbols can land. That makes a long round possible, because each reel can pay several times. When spins run out, whatever is left on the grid is added to the meter. The Bonus Game uses the same bet as the spin that triggered it.

The Castle of Slotenstein Bonus Game with orange and purple pumpkins holding values and the win meter at 75.00 — Mid-bonus: filled reels pay into the meter at the top.

Grand Reel of Fortune

A Grand Reel of Fortune with 5 locked sections sits above the Bonus Game grid. Each reel is tied to one section, and the first time a reel fills all 3 positions, that section unlocks. Unlock all five and you get one spin of the Grand Reel after the bonus total is counted.

It holds 8 prizes. The x2, x3, x5 and x8 multipliers multiply the whole Bonus Game win. The special prizes add a fixed amount instead: MINI 50x, MEGA 150x, SUPER 500x and GRAND 3000x the bet. At a 10.00 bet the panel beside the reels shows those as 500, 1,500, 5,000 and 30,000.

The Castle of Slotenstein Grand Reel of Fortune landing on x2 after a 350.00 bonus — Our Grand Reel spin landed on x2.

Bonus Buy options and our demo results

The Bonus Buy menu has two options. Bonus Game with 1-3 random Boosters costs 48x the total bet and has a 96.35% RTP. Bonus Game with all 3 Boosters costs 96x and has a 96.24% RTP. Buying only works in the main game.

We played at a 10.00 bet in demo credits. The 48x option cost 480.00 and gave us Trick alone. Purple pumpkins filled several reels, all five Grand Reel sections unlocked, and the meter stood at 350.00 (35x the bet). The Grand Reel then landed on x2, so the bonus paid 700.00, which is 70x the bet and above the price.

The 96x option cost 960.00 and started with Shock, Trick and Treat active, so 4 spins per reset. The grid got busy with Blue and Purple pumpkins, but we did not unlock the last Grand Reel section, and the round paid 600.00, or 60x the bet. That was a loss on the buy. Both results are single rounds, not averages.

The Castle of Slotenstein Bonus Buy menu offering Up to 3 Boosters for 480.00 and All 3 Boosters for 960.00 — The two Bonus Buy options at a 10.00 bet.

The Castle of Slotenstein Mega Win screen showing 700.00 from the 1-3 boosters bonus buy — The 48x buy paid 700.00 after the x2.

The Castle of Slotenstein Bonus Game with all three boosters active and a full grid of orange, blue and purple pumpkins — The all-boosters buy filled the grid but paid 600.00.

RTP, max win and bet range

The rules list a 96.20% RTP for normal play, 96.35% for the 1-3 boosters buy and 96.24% for the all-boosters buy. The intro screen advertises wins of over 3000x, which lines up with the 3000x GRAND prize that can stack on top of a bonus total. The rules do not give a volatility rating.

The demo showed a minimum bet of 0.10 and a maximum of 20,000.00 demo credits, with 10.00 as the default.

Our verdict

The Castle of Slotenstein hides a smart bonus behind a very ordinary base game. Reels that clear and pay again, three boosters that change how values grow, and a Grand Reel that can double or add 3000x make each feature feel different. The 48x buy has the slightly higher RTP and gave us the better round, while the 96x all-boosters buy looked busier but still fell short of its price on our one try. Play the free demo first to see how often the Grand Reel unlocks for you.

How to play The Castle of Slotenstein free in Canada

Press Play demo for free on the game page and the Evoplay demo loads with virtual credits. There is nothing to download, no account to create and no deposit to make, and it works in your browser on desktop and mobile.

Demo credits have no cash value, so you can test bet sizes, trigger the features and learn the paytable without risking anything.

Playing The Castle of Slotenstein for real money in Canada

Real-money online gambling in Canada is regulated province by province. Ontario runs a regulated market where licensed operators are overseen by iGaming Ontario and the AGCO; other provinces offer play through their own provincial sites, such as PlayNow (British Columbia, Manitoba and Saskatchewan), Loto-Québec, PlayAlberta and ALC in Atlantic Canada.

The legal age is 19 in most provinces and 18 in Alberta, Manitoba and Quebec. Only play at sites licensed where you live, set limits before you start, and treat gambling as entertainment, never as a way to make money.

The Castle of Slotenstein FAQ

What is the RTP of The Castle of Slotenstein?: The rules list 96.20% for normal play, 96.35% for the Bonus Game with 1-3 boosters buy and 96.24% for the Bonus Game with all 3 boosters buy.
How do you trigger the Bonus Game?: Green, Purple or Blue Bonus symbols can land on any reel. One to three of them may trigger the Bonus Game, and four or more guarantee it. The colours on the triggering spin decide which boosters are active.
What do Shock, Trick and Treat do?: Shock raises the Bonus Game spins from 3 to 4. Trick adds Purple Bonus symbols that boost or fill their own reel. Treat adds Blue Bonus symbols whose value is added to every Orange Bonus on the grid.
How much does the Bonus Buy cost?: The 1-3 random boosters option costs 48x the total bet and the all 3 boosters option costs 96x.
What can the Grand Reel of Fortune award?: One spin, after unlocking all 5 sections in the Bonus Game. Prizes are x2, x3, x5 or x8 on the bonus win, or MINI 50x, MEGA 150x, SUPER 500x or GRAND 3000x the bet added to it.
Can I play The Castle of Slotenstein for free in Canada?: Yes. The The Castle of Slotenstein demo on CasinoDemo is free, needs no sign-up and uses virtual credits only.

More Evoplay slots

Explore more

All 238 Evoplay games
Featured Evoplay slot: Penalty Shoot-out: Street review
Best online casinos in Canada 2027
Browse all free demo slots