Game ThemeGems and Jewels |
ProviderGames Global |
VolatilityHigh |
RTP96.4% |
Max Multiplier |
Min Bet0.20 CHF |
Max Bet2'200.00 CHF |
Kings of Crystals is a video slot with 5 reels and 4 rows, taking you into a medieval fantasy world with three very different rulers. Each king guards his own crystal crown in red, blue, or green – and these crowns are the key to the game’s main features. The studio behind the throne is All For One Studios, and the slot was released on 03.02.2022 (with a wider release on 01.03.2022). The game runs on a 40 fixed-payline grid that can expand in certain bonus rounds with additional rows.
The base game is simple: you spin the reels, match symbols from left to right, and aim for lines of royal figures, gauntlets, chalices, and card values. In the background, a dramatic medieval setting shows the three kings competing for the power of the crystals. The Green King is especially important as a premium symbol, paying up to 5x your stake for a five-of-a-kind, while the other kings as well as the gauntlet and chalice pay up to 2.5x the stake per line.
Wild symbols appear only on reels 2, 3, and 4 and substitute all standard symbols except scatters and special coins. They can appear stacked, forming a dense Wild wall in the center of the grid. Combined with the royal symbols, they can create very strong line wins, especially in expanded bonus rounds.
The core of Kings of Crystals is built around the three colored scatter crowns (red, green, blue). These crowns are collected and trigger separate free spin modes: nudging Wild free spins with an expanded 5x6 grid and 100 paylines, Jackpot free spins with letter coins and four fixed jackpots, and multiplier free spins with random multipliers up to x10 per spin. Most importantly, different colors can be combined to activate up to all three features at once.
Another key technical point is the maximum win of x10,000 the stake, achievable through the fixed Grand Jackpot tier as well as line and feature combinations. The game uses HTML5 and JavaScript and has a file size of around 1,000 MB, indicating a high level of graphical detail. It was last updated on 11.12.2023.
Since all monetary values are based on euros, they can be easily converted to Swiss francs: the betting range from 0.20 EUR to 20.00 EUR is roughly equivalent to 0.20 CHF to 20.00 CHF. Overall, Kings of Crystals sits firmly within the standard range for modern online slots while maintaining a clear structure focused on its three crystal kings and their diverse bonus modes.
Visually, Kings of Crystals uses a medieval fantasy setting with a slightly unconventional style. At the center are the three kings: a traditionally drawn, powerful-looking ruler, a more aggressive-looking king, and a striking blue-haired king who feels almost otherworldly. These characters add color and personality to the screen, even though the overall art direction leans toward a more classic and slightly conservative look.
The background feels like a mix of throne room and mystical landscape, where the kings’ crystals play a central role. The color palette ranges from deep green and gold tones for the “benevolent” green king to strong reds and blues for the other rulers. In the foreground, the 5x4 grid dominates, expanding in the red scatter round into a 5x6 grid with 100 paylines. This shift enhances the feeling of moving between the different realms of the three kings.
The graphics are detailed but remain more classic than hyper-modern. On smaller screens, the assets feel compact and cohesive, while on larger displays it becomes clear that traditional rather than high-end vector techniques are used. The animations are functional: reel spins, wild nudges, and jackpot meter builds are all presented clearly, without overly spectacular effects. The focus is on making mechanics—such as nudging wilds or filling jackpot meters with coins—easy to understand visually.
The symbol set in Kings of Crystals is classic in structure but clearly organized. It includes low, medium, and premium-paying symbols as well as several special icons with defined roles.
All payouts in the paytable are dynamic and depend on the current stake level. Combined with stacked wilds and expandable feature reels, the symbol system becomes especially powerful in bonus rounds.
The audio design creates a strong contrast: the base game features a highly dramatic soundtrack reminiscent of cinematic medieval scenes. Between spins, a distinct rhythmic beat maintains momentum and reinforces the spinning feel. Menus, paytables, and settings are instead supported by lighter, almost playful music reminiscent of strategy or builder games.
Spin sounds, win triggers, and feature activations are clearly differentiated. When stacked wilds move up or down, a dedicated sound effect highlights the mechanic. Similarly, coins falling in jackpot rounds produce distinct audio cues when revealing letters or cash values—each sound emphasizes that an important game element has been activated. Overall, the sound consistently supports the medieval fantasy theme without becoming overwhelming.
The slot is core-built on a simple 5x4 layout with 40 fixed paylines, but the true dynamic arises from the interplay of the three scatter colors, stacked wilds, and jackpot coins. All advanced mechanics are bundled into the free spin modes, which you reach by collecting the colored crowns. Additionally, there is a Bonus Buy function where specific free spin modes can be started directly, as well as combinations of multiple features in a single bonus round.
| Function | Description |
|---|---|
| Base layout and line structure | 5 reels, 4 rows, 40 fixed paylines in the base game. Wins count from left to right, starting on the first reel. In the red Nudging Wilds round, the grid expands to 5x6 and 100 lines become active. |
| Stacked Wilds (Base game) | Wilds appear only on reels 2, 3, and 4 and can land as stacked symbols. They replace all regular symbols (except scatters and coins) and form a kind of wild bridge in the center of the grid, which is particularly relevant in combination with premium symbols like the green king. |
| Scatter collection and free spin trigger | Three different scatter crowns (red, green, blue) are collected. Red scatters activate Nudging Wilds free spins, green scatters start jackpot free spins with letter coins, blue scatters open multiplier free spins with random line-win multipliers. Different colors can be combined, causing features to overlap and creating free spin rounds with multiple active modifiers. |
| Nudging Wilds free spins (Red scatter) | 5 free spins with an expanded 5x6 grid and 100 paylines. Wilds appear in stacks of at least 6 symbols and nudge automatically up or down until the entire reel is filled with wilds. Red scatters within this round award +1 or +2 additional free spins. Landing green or blue scatters can upgrade the ongoing round to a combined feature round with further modifiers. |
| Jackpot free spins (Green scatter) |
10 free spins with a focus on the four fixed jackpots. Golden coins appear on the reels, displaying either an instant win of 1x to 10x the bet or a letter. The letters fill the jackpot meters:
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| Multiplier free spins (Blue scatter) | 5 free spins where a random line-win multiplier of x2, x3, x5, or x10 is active per spin. All line wins of that spin are multiplied by the displayed value. Blue scatters can trigger +1 or +2 additional free spins during the round. Landing red or green scatters can expand the ongoing round to include the corresponding features. |
| Combined feature free spins |
Different scatter colors in a single trigger moment lead to combined rounds:
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| Bonus Buy function |
Various purchase options are available:
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| Maximum win | The slot offers a maximum win of 10,000x your bet. This value is tied to the highest jackpot level (Grand) and can be achieved within the jackpot free spins via the letter collection. |
Kings Of Crystals combines a classic 5x4 layout with a clearly structured feature architecture centered around three colored scatter crowns. The game's biggest plus is the combinability of the bonus rounds: Instead of having only one fixed free spin mode, you can activate red, green, and blue individually or together. This creates very different gameplay phases—from pure nudging wild rounds to complex mixed forms where wilds, multipliers, and jackpots are active simultaneously.
In direct comparison with other medieval-themed slots with multiple modifiers—such as titles where different clans, houses, or factions each bring their own features—Kings Of Crystals positions itself along a similar line: multiple clearly defined bonus types that overlap depending on the combination. The jackpots, which are formed here via letter coins, are reminiscent of other games where fixed-tier jackpots are collected, but they rely on a much more transparent system: you see exactly which word you still need, how many letters are missing, and what fixed amount is behind it.
At the same time, the slot's design is deliberately grounded. The base rounds come without additional effects, apart from the stacked wilds that can appear on the middle reels. This makes the contrast to the free spin modes even more striking: As soon as a feature is running, the structure of the playing field changes, the number of lines increases, or multipliers and coins come into play. Anyone looking for a slot where the essential mechanics are bundled into the bonus phases will find a clear example here.
Objectively considered, the slot can be summarized as follows:
Compared to similar jackpot slots with fixed tiers, it is noticeable that Kings Of Crystals works very clearly with concrete values: 25x, 50x, 500x, and 10,000x bet are clearly named jackpot pots addressed via the words MINI, MINOR, MAJOR, and GRAND. Other games often rely on symbolic representations like crowns, chests, or logos without highlighting the concrete multipliers as prominently. Here, it is always clear how the structure is built and what target size is behind each jackpot.
Another aspect that sets Kings Of Crystals apart from some other fantasy slots is the role of the stacked wilds. They are important in the base game but only become the central mechanism in the red scatter round when they fill reels completely and work on an expanded grid with 100 lines. In this point, the slot is reminiscent of other games with expandable reels and sticky or nudging wilds, but remains manageable in its structure because the expansion is limited to a clearly outlined mode.
Anyone familiar with games with freely selectable free spin modes will find a related, though not identical, solution in the Bonus Buy options of Kings Of Crystals: Instead of having different "packages" with fundamentally different rules, you specifically buy the three core features here—either individually or in combination. This allows you to focus specifically on nudging wilds, multipliers, or jackpots, or on a total round where everything comes together.
In summary, Kings Of Crystals offers a stringent, technically clearly structured overall package: a classic 5x4 base layout, clear symbol hierarchies, three cleanly defined bonus types, and a structured jackpot system with maximum values up to x10,000. Compared to other similarly structured fantasy or jackpot slots, the game stands out primarily due to the ability to specifically combine bonus functions and set transparent jackpot goals through letter collection. Anyone who likes these mechanics will find an example in Kings Of Crystals that implements these elements in a concentrated manner without additional side features.
OL-AGG-20220308-011
