| Casino Review May 2023
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Slot Codex — Game Review

Codex Slot Review

You don’t have to be a genius to decode this Codex mobile slot, just a little bit brave.

The graphics feel sharper, the animations flow faster, and it’s just a little bit prettier.

But, that said, the Codex slot on mobile still looks nice enough, with mystical diagrams and Ace to 9 symbols that, if not pop, create an atmospheric feel.

The free spins are fun, but the Codex is better

There are two bonus games that you’ll eagerly anticipate.

The first is the free spins, which is a lot of fun, but so hard to find at times, you might wonder if they exist.

The second is the Vault Trail click me bonus, where you gamble your winnings for more prizes, as you click to decipher what’s behind the Da Vinci Gizmo.

The Codex slot doesn’t reveal it’s secrets easily

The thing about both these bonuses is that they can be tough nuts to crack. Just because they can pay big, doesn’t mean they will.

With the Vault Trail bonus, the only advice we can really give you is to be a little brave – try and get further along the trail and gamble a little – it’s where you’ll get some decent 100+ wins.

All in all, this SpielDev slot game isn’t exactly revolutionary, but it’s interesting enough to keep you try to figure out if this puzzle box will open up to reveal the best kind of wins.


  • Codex Mobile Slot Machine
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Codex slot stats

Mobile Slot releasedJune 2017
Slot typeVideo Slot
Slot reels / paylines5 Reels / 20 Paylines
House edge / RTP4.99% / 95.01%
Slot volatilityMedium
Coins range0.01 — 2.00
Min/Max bet0.20 / 60
Free spinsStarts at 7 Free Spins / Sticky Wilds
Bonus roundsWilds, Scatters, Sticky Wilds
Slot ThemesClassic & Retro

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In-game bonus features

Wild Symbol: The green wild symbol is wild and can sometimes come stacked during the main game. It also replaces all other symbols on screen except scatter, vault bonus, or invention symbols for an invention combo.

Invention Combo Feature: When the top three highest paying symbols show up anywhere on screen, you get a multiplier of 4x, 5x or 6x your total bet.This isn’t huge, but it certainly helps top up your wallet every now and then when those 5 of a kind wins are few and far between.

Scatters and Free Spins: 3, 4 or 5 free spins trigger 7, 10 or 12 free spins respectively.

You can re-trigger these spins indefinitely, but to be honest, you’ll be lucky to get those coveted 7.

Vault Trail Bonus: 2 Vault Bonus symbols anywhere on screen trigger the Vault trail bonus.

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Each reel contains progressively bigger prizes, but if at any point a symbol turns red, don’t worry: you can re-buy a spin on that reel, if you have enough prize money banked.

You’ll then be shown to a second screen where you’ll see a gizmo, with reels, called a cryptex (not a Codex, funnily enough).

Your mission is to spin each reel, and get the right symbols. You’ll know because those symbols turn green, you’ll get cash, and move on to the next reel.
Of course, you might not want to gamble away your winnings, so thats a choice you’ll have to make. Personally, we think it’s worth trying to get to at least reel 4 for any decent prizes, but we like to take risky bets.

Codex Review Conclusion

We were pleasantly surprised by this Codex online slot. We weren’t expecting much from SpielDev, but found ourselves enjoying a fun 20 payline game with several bonus feature.

Could the free spins have come a little more often? Sure. But when have we not said that?

Ultimately, this is a medium variance game, with decent returns, and graphics that pop online, even if not shine on mobile.

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Review by Lucky Mobile Slots , last updated: March 25, 2021 — Rating 3

Codex of Fortune Slot Review

Codex of Fortune is a new casino slot from NetEnt, where luck is really put to the test. In this slot, which is inspired by the French Art Nouveau-style, we collect keys that result in us getting further on our quest to the big wins. It is a modest setup of 5 reels and 4 rows, but which together with the Fortune wins meter can give really festive wins.

Codex of Fortune is a casino slot from NetEnt that has 5 reels, 4 rows and 40 paylines. You can choose between making a Min.bet of 0.20 and a Max.bet of 100. When it comes to the game’s RTP, it is 96% in average, where it can vary between 90.2% to 98% depending on how much you grind through the game. The game has a high volatility, Hit frequency of 25.4% and you can win up to 10000X the bet.

When it comes to the game’s features, there are many of these that you can take part in, and they are Wild Symbols, Fortune Wins, Save the Keys, Fortune Re-Spins and Free Spins. During the spins in this luxuriously designed slot, you will be able to gather collectable symbols within a bonus win game that results in you being able to climb higher on a win ladder. There are 7 levels where each individual level has 5 steps, which will gradually increase the chances of winning big. Where this Fortune Wins mechanic can give up to 200X in Fortune Re-Spins and in the Free Spins it can give up to 10000X. To make this extra exciting, NetEnt has added the ability to activate both of these features on the same bet.

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As mentioned, you will be able to pick up collectable symbols, but during the spins in Fortune Re-Spins you will also be able to collect keys that you can then choose to use within the Free Spins feature instead of getting a direct payout. If the player instead chooses to use the keys directly, it will result in an extra-large payout from the win.

Codex of Fortune Slot Information

The game’s design consists of a very luxurious gold-plated theme inspired by the French Art Nouveau style. The game has 5 reels and 4 rows, where to the left of the reels we can see a large Fortune Wins meter. The reels are gold plated and the same goes with all of the beautifully designed symbols. You create a winning combination by landing 3 or more of the same symbol type on adjacent reels starting at the far left.

The lower paying symbols are J, Q, K and A. The higher paying symbols are a blue shell, a green carp, a yellow turtle, an orange owl and a red lion. The game’s Wild Symbol consists of a golden woman with wings like a butterfly and the game’s scatter symbol consists of a peacock with the text scatter on it. Each symbol exudes a very glamorous feel. The game’s key symbol that you will be able to collect is created in gold with a lot of diamonds that adorn it. Let’s find out what the features do.

Codex of Fortune Slot Features

What is the max win in the Codex of Fortune slot?

You can win up to 10000X the bet.

What features are in the Codex of Fortune slot?

The features are Wild Symbol, Fortune Wins, Save the Keys, Fortune Re-Spins and Free Spins.

Wild Symbol

This symbol helps to create more winning combinations by substituting for other symbols. The only symbols it doesn’t substitute for are the key and scatter symbols.

Fortune Wins

This feature is activated through both the Fortune Re-Spins and the Free Spin feature. You will to the left of the reels see a gold-colored cylinder that will show different values depending on how many key symbols and unique collectable symbols you have collected. Something that applies in both features is that this cylinder has 7 levels, where each level has 5 steps. By gradually increasing the level, a higher multiplier will be obtained, where within the Fortune Re-Spins you can get up to 200X and within the Free Spins you can get up to 10000X.

Save the Keys

This feature gives you choices, where you can either choose to use the keys you received directly and collect the prize. You can also choose to save and use up to 3 key symbols within the free spins feature, which provides an opportunity to receive bigger winnings. If you choose to save the keys, the meter will be reset to level 1, but at the same time it is by saving keys that you can obtain the maximum RTP in the game.

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Fortune Re-Spins

If you spin the reels and land 2 scatter symbols, the Fortune Re-Spins feature is activated. Before you can take part in this Re-Spin, all symbols will disappear from the reels, except for the symbols that were part of the winning combination. These symbols that were part of the winning combination become the collectable symbol and during the Re-Spin that takes place, symbols, blank positions and keys can land. If you land more of these collectable symbols, you will receive another Re-Spin. You can increase 1 level by either getting 5 collectable symbols or 1 key symbol. The great thing about this feature is that you can get Re-Spins as long as more collectable symbols land, where you can get up to 20 symbols.

Free Spins

If you land scatter symbols on reels 1, 3 and 5, the Free Spins feature is activated. You will then be able to take part in spins on a wheel that gives you between 7 to 13 free spins, determine what your collectable symbols are and potentially give key symbols. This is also where you can use your previously possibly saved key symbols.

Within this feature, 20 collectable symbols are required to level up and it can also land special collectable symbols that show +10. If you land these, it counts as 10 collectable symbols and you can also land symbols that show +1 spin, where you get 1 extra free spin.

Codex of Fortune Slot Conclusion

This is a slot that at first glance may seem a bit complicated, but once you have entered the game and begin to understand the potential of the golden key symbols, everything immediately becomes very exciting. The game comes packed with many different features where the Fortune wins are truly the star, whereby collecting collectable symbols and keys within the features Fortune Re-Spins and Free Spins you can get a multiplier of up to 10000X.

The options within this slot are very nice where through the Save the Keys feature you can choose to receive a prize directly or to save the key symbols to the Free Spins feature. Sometimes the direct prize can be very tempting to take, but if you have patience and play through the game, the patient soul can be richly rewarded. The game’s RTP which has an average of 96% can extend up to an incredible 98% if you play and get many key symbols. The potential maximum win is very high, although we have seen significantly higher in previous games from this game developer, such as Rome: The Golden Age where there was a potential maximum win of 100000X the bet.

Codex of Fortune is a solid slot from NetEnt, where the patient and grinding soul with the help of the various features can win really big.

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Codex of Fortune Slot Review

Codex of Fortune

Turn the codex and see if you can win as much as 10,000x your bet thanks to some handy keys and plenty of respins in this Codex of Fortune slot.

Codex of Fortune is a 5 reel 40 payline slot machine steeped in luxury, where 2 scatters and a win will trigger a re-spin where you collect symbols to get instant cash wins.

3 scatter will trigger the free spins, giving you a higher chance to turn the key on the codex and win that top win. But you have to collect keys to turn that codex.

Sounds complicated? It is a little bit. Especially if you don’t use the right slot strategies, the RTP of this Codex of Fortune slot can go as low as 90%. But if you use the right strategy, it can go up all the way to 98%, better than most mobile slots out there.

How the Codex works:

But you only have 1 respin to try and collect as many symbols as you can and go up that Codex. At most you are looking at winning 150x your bet.

Unless you get a key, and turn the Codex to the next level, giving you a higher instant cash win amount. But here’s the thing – you absolutely should NOT do that.

What’s the best Key strategy for the Codex of Fortune slot?

The optimal Codex of Fortune mobile slot strategy is to save the keys won in fortune re-spins and to use them in free spins when you have 3 or more keys saved.

Obviously, if you are about to run out of budget use them on the single re-spin if you need to. But if you can wait for those 3 scatters, you’ll get 7 to 15 free spins to try and collect super symbols and super wins.

Because at the start of the Codex of Fortune free spins you can choose to use your saved keys to automatically increase the win by up to 3 levels – a top win of 400x your bet.

If you manage to get all the way to level 7 that’s where you’ll win 10,000x your bet plus any wins from the free spins. The most we’ve won is 1,000x our bet, but we can promise you we didn’t care. We loved it.


  • Codex of Fortune Mobile Slot Game
  • Codex of Fortune Free Spins Wheel
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Codex of Fortune slot stats

Mobile Slot releasedJuly 2021
Slot typeVideo Slot
Slot reels / paylines5 Reels / 40 Paylines
House edge / RTP9.8% to 2% / 90.2%
Slot volatilityMedium
Min/Max bet0.20 / 100
Max win10,000x your bet
Slot ThemesGold

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In-game bonus features

Wild: This butterfly symbol can appear anywhere and substitutes for all symbols except for scatter symbols, key symbols, and +10 symbols. The wild symbols are not collected to full the fortune wins.

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Fortune Re-spins: 2 scatters on the reel in combination with a bet line win triggers this respin. Collectible symbols are then sticky on the screen, and more could be collected to fill the fortune wins meter. Each time the meter is full it moves the codex upwards for instant wins.

There are 7 levels, but the level you are likely to play on the most in the base game:

  • Step 1: 5x your bet
  • Step 2: 10x your bet
  • Step 3: 20x your bet
  • Step 4: 50x your bet
  • Step 5: 150x your bet

To move up the levels you need to collect keys, which you can then use to turn the codex and go up higher levels during the respins. How much you win per level depends on:

  • Level 1: 150x your bet
  • Level 2: 200x your bet
  • Level 3: 400x your bet
  • Level 5: 2,000x your bet
  • Level 6: 5,000x your bet
  • Level 7: 10,000x your bet

The respins end when no more of the collectible symbols show up.

Free Spins: 3 scatter symbols with or without a bet line win triggers the free spins. If you have any save keys you can use them now to increase your

Save the Key Feature: At the of a Fortune Re-spin, if you’ve won any keys, you’ll be offered a choice to save the keys. If you choose not the save the keys, you switch levels and win an instant win there and then. If you choose to save the keys, the fortune wins level is reset to level 1. You can use up to 3 saved keys to level up the fortune win.

You’ll then spin a fortune wheel to determine how many free spins your win, 7 to 13. One collectible symbol will now be chosen in the free spins and it’s always a medium or low win symbol.

The special +10 collectible symbol landing anywhere on reel 2 fills the meter by 10, but each time the meter is filled by 10 spaces, you move one step up the Fortune win. A key on reel 5 will instantly level up the Fortune Wins.

At the end of the free spins, the total win of the bonus round and the Fortune win are added together to give you your total win.

Codex of Fortune Review Conclusion

There’s something remarkably fun about this Codex of Fortune slot on mobile though we suspect this game won’t be for everyone.

Mostly because it’s incredibly frustrating to have to find those scatters, wins, and keys, and you feel like you are trying to actually break a code.

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Review by Lucky Mobile Slots , last updated: October 10, 2022 — Rating 4

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