| Casino Review May 2023
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Slot Hidden — Game Review

3 Secret Cities

4ThePlayer have cemented themselves into the market from their very first release as having a clear image for their games, and their brand alike. A bit of a quirky provider straying from the norm, each slot released has contained numbers (123 Boom!, 6 Wild Sharks, 9k Yeti), and this newest release is no different. 3 Secret Cities takes us on a trip not unlike Indiana Jones in the Lost City, and brings us some already known concepts in fun and interesting ways. 4ThePlayer are also continuing with their mobile mechanic, Big Reel Portrait Mode™, to ensure players on a mobile device get the full experience from their games. Big Reel Portrait Mode turns the reels into a portrait layout, and pays from top to bottom, rather than the usual left to right. 3 Secret Cities has an RTP of 96.50%, raising to 98.00% within the feature buy, is listed as “very high” volatility, and offers players the chance to hit the maximum win of 50,000x bet.

3 Secret Cities Base Game

3 Secret Cities Base Features

At first glance, 3 Secret Cities could be mistaken for fairly basic, however this 5 reel, 1024 ways slot hides a lot underneath the surface, not unlike the namesake Secret Cities. Wins pays from left to right, where consecutive symbols beginning on reel 1 are required to form a win. Low paying symbols within 3 Secret Cities consist of 10, J, Q, K and As, paying between 1 and 2x bet for 5 of a kind. Premium symbols consist of golden snakes and silver necklaces, both paying 2.5x bet for 5 of a kind, and black panthers, which pay 3x bet for 5 of a kind. An adventurer and a priestess pay 4 and 5x bet respectively, again for 5 of a kind. Jaguars and both the female characters pay for 2 of a kind, but every other symbol requires 3 or more for a win.

3 Secret Cities Symbols

There is a golden aztec sun stone which acts as the wild symbol, substituting for every symbol except the scatter symbol, which is represented by bronze, silver and gold temple symbols. Scatter symbols contain the words “Free Spins”, so there is no confusion. It’s clear to see the thought that has went into not just the audio of this slot, with the subtle sounds of the jungle in the background, but the entire pay table. Even the lower paying royal symbols, which are far too easy to forget about, contain quirky elements to add to the theme, such as the J containing a map, and the A containing a compass.

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3 Secret Cities Bonus

Landing 3 scatters on reels 1, 3 and 5 triggers the Free Spins. However, landing just 2 scatters on reels 1 and 3 awards a pick, which will reveal either a cash prize of up to 50x bet, or progression to the next stage or location within a map that contains Jungle City, Lake City and Gold City, through BONUS↑UP.

3 Secret Cities Map

When the pick feature rewards players with a move along the stages, the map will open. Alternatively, clicking the box in the top right hand corner of the screen will open the map, or just reading this box will allow players to see the maximum possible prizes of their next bonus. The locations within the map denote what your Free Spins picks can award at the maximum level. At the first location, Jungle City, players can unlock up to 12 free spins, with up to a x4 win multiplier, with the chance to win up to 12,000x bet. This continues to build, through the second location (Lake City) where players can unlock up to 25 free spins, with a win multiplier of up to x8 with a chance to win up to 30,00x bet, right to the final location; Gold City. At the final stage within Gold City, players can unlock up to 50 free spins, with a win multiplier of up to x15, and can win the maximum win on offer within 3 Secret Cities – 50,000x bet.

3 Secret Cities

3 Secret Cities

When Free Spins are triggered, players progress to a temple where they are awarded various picks, climbing the temple to reveal their feature. Choices during Temple Pick include an amount of free spins, a symbol to super stack, a win multiplier, or an x to symbolise the end of the picking round, and the beginning of the Feature. The top prizes available in Temple Pick are determined by a players progress in BONUS↑UP. Landing scatters on reels 1 and 3 within free spins awards a retrigger of between 5 and 1o free spins, and players will again have the chance to make a pick to determine this.

3 Secret Cities Temple Pick

After playing the Free Spins, a players location within BONUS↑UP will always reset to Jungle City, which has the best bonus chance. BONUS↑UP progress is stored between play sessions, and RTP is the same for all locations.

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Finally, players have the chance to buy a feature, where RTP is raised from 96.50% to 98.00%. When a feature is bought, BONUS↑UP progress is retained for the normal game. The cost of the 3 available feature buys are:

  • Jungle City, 15 Free Spins x5 multiplier: 50x bet.
  • Lake City 25 Free Spins x8 multiplier: 100x bet.
  • Gold City 50 Free Spins x15 multiplier: 200x bet.

First Impression

4ThePlayer tend to do things differently rather than sticking with the norm, and on this occasion it seems those decisions have paid off. 3 Secret Cities is a fun, vibrant, clean game with a clear picture of what the player wants to achieve. The added element of progression with BONUS↑UP gives players the emotions of moving towards something – in this case, a maximum win which sits at a whopping 50,000x. With a maximum win this high, directly competing with some of the most highly regarded slots of the past year, and a solid RTP it’s clear to see that 3 Secret Cities could easily become a fan favourite. Well established fans of 4ThePlayer could consider this to be the best in their catalogue so far, and for players who haven’t succumbed to the charm of this provider, this could be the slot that tips the scales in their favour. Adding the slightly higher RTP for the bonus buy feature further adds to the desire of this slot, particularly with offering different levels for players to enter into the buy, and picks to give the feeling of being in control. This slot has been intelligently designed to capture the attention of all players, and with a “very high” volatility rating, we expect to see some huge results.

*The screenshots taken of games reviewed on this site are taken from Demo Play, as reviews are often written before games are released for real play.

Hidden Slot

Hidden Slot

Hidden is a popular and highly entertaining slot machine available to play on Spin Castle for free. It has everything that makes up for a successful Elk Studios slot machine gaming experience, high quality graphics and sound effects, an incredible game play and the opportunity to play with one of the top casinos online to give you a chance to play with real money.

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Starting with a great intro, Hidden Slot has the potential to suck you into the game with all your attention. Great design, fitting musing and really great game features are some perfect invitation to play. There is however one thing to realize. Most of the treasure hunters paid the highest toll and only some found the hidden treasure. In gambling there is no exception to this rule / as you might have guessed.

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Game Info

CasinosMr Green
Game PlatformELK Studios
Symbols10, J, Q, K, A
Game FeaturesSticky Wild Reels, Flashback Re-Spins
Free SpinsYes
ThemeEgypt Pyramids
Ways to Win178
Graphics6 / 10
Sound Effects6 / 10
Entertainment6 / 10

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Cosmic Quest 2 Free Slot Machine Game

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Buffalo Spirit

WMS Gaming can never underestimate their players and the fact is crystal clear with the way they have designed this colorful slot of Buffalo Spirit slot game

Dragon Ship Free Slot Machine Game

Dragon Ship Free Slot Machine Game

Dragon Ship online slot designed by Play N’Go is quite intriguing, as the theme on which it was made is itself intriguing. Don’t forget to experience what Vikings are with this slot game

Hidden Slot Review

The Great Pyramids of Giza are surrounded by myths and legends, but only the Hidden slot will reveal their deepest secrets.

We love mobile slot games with a good theme, and Elk studios always delivers. Even their 3 reel classic Ivanhoe slot has a storyline.

And because of it, they’ve even managed to make what is a standard Egyptian theme a little more exciting.

All because you get an introduction where Professor Taylor and his nephew Benjamin stumble across an ancient drawing that will lead them to treasure.

Go on a journey where two random bonus awaits

Other than the two characters on screen, this is basically ancient Egypt over huge 5×4 reels that give you 178 ways to win.

There’s no standard wild keeping you company on these Hidden slot reels, just symbols that tumble onto the screen giving you little wins from time to time.

So why did we give it 4 stars? Because we couldn’t go less than 20 spins without randomly triggering one of two bonus free spin features.

The Hidden slot gives you wins in unexpected hidden ways

The Flashback Re-Spins are the ones that you’d think would give you the biggest wins.

Namely because randomly you get transported back in time, and you get anything from 1 to 3 full reel totally wild for all 3 spins.

Because, as the name suggests, it’s the Treasure Room free spins where you’ll find all the action.

Symbols that expand horizontally and vertically

This is where things get interesting, as one symbol is chosen for these 5 free spins to expand to cover a 2×2 space.

So imagine, three symbols in the right spot can cover half of these Hidden game reels.

The trick is to get a King or a Queen symbol, as they are more prolific, so more likely to show up over the screen.

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But it’s far prettier, the wins come more often, and using one of their four betting strategies, you’ll probably walk away at least a little richer.


  • Hidden Mobile Slot Machine
  • Hidden Mobile Slot Wilds
  • Hidden Mobile Slot Free Spins Bonus

Hidden slot stats

Mobile Slot releasedSeptember 2017
Slot typeVideo Slot
Slot reels / paylines5 Reels / 178 Ways to Win
House edge / RTP3.7% / 96.3%
Slot volatilityMedium/High
Min/Max bet0.20 / 100
Max win215,000
Free spinsStarts at 3 to 5 Free Spins / Sticky Wild Reels or Expanding Symbols
Bonus rounds2 Free Spin Features, Sticky Wilds, Wild Reels, Expanding Symbols
Slot ThemesAdventure & Explorer

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In-game bonus features

Treasure Room Free Spins: Three magnifying glasses on any reel positions trigger 5 free spins bonus games.

At this point any one of the symbols on screen will be randomly selected. Every time it shows up on screen, it will expand to cover a 2×2 space, creating big blocks of identical symbols.

The good news is that a single magnifying glass will trigger a further Hidden slot free spin.

So chances are you’ll probably play more like 8 free spins.

Flashback Re-spins: Out of nowhere you’ll be transported back in time when the pyramids gleam under a dessert sun.

You then get 3 re-spins where you’ll get any of reels 1, 3 or 5 fully wild. It could just be one, it could be all three.

Either way, they stay sticky for the entire 3 re-spins.

Hidden Review Conclusion

This Elk Studios Hidden slot on mobile pleasantly surprised us.

Mostly that’s thanks to two frequent bonus game features that hit so often, you barely miss the fact that the wins in the base game are few and far between.

Adding a great theme that elevates what could have been a plain Egyptian slot into an adventure game with a little more heart.

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Review by Lucky Mobile Slots , last updated: March 25, 2021 — Rating 4

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