The Green Knight Oath of Thorns – Slot Overview
In most walks of life, loyalty is an admirable quality—and in online slots, some developers show it by holding fast to successful ideas. Play’n GO is no stranger to that approach, often revisiting its hits with sequels and reimaginings. The Green Knight (2021) followed The Sword and the Grail, which then led to Return of the Green Knight in 2023, The Sword and the Grail Excalibur in 2024, and now, in 2025, The Green Knight Oath of Thorns. As ever, the focus is on powerful wild multipliers and the signature free-spins-within-free-spins mechanic.
Play’n GO’s flair for bringing legendary tales like the Arthurian myths to life on the reels is on full display here. The action unfolds in a lush forest, the grid framed by trees and foliage, with Camelot’s towers faintly visible across a lake in the distance. The result is a rich, immersive backdrop—one that makes it feel like you’re donning spiked gauntlets and stepping into battle against forces of darkness.
The math model in The Green Knight Oath of Thorns can be summed up as sturdy—and highly volatile. It offers a maximum RTP of 96.27%, with stakes ranging from 10c to $/€100 per spin. Gameplay takes place on a 5×3 grid with 20 paylines, awarding wins for 3–5 matching symbols from left to right.
Low-pay symbols are stone-carved 10–A royals, paying 2x–4x the bet for five of a kind. Four premium character symbols sit above them, awarding 7.5x–25x for five on a line. Wild symbols substitute for all regular pays and can deliver the game’s top line prize—100x the bet—for a full five-wild win.
The “thorn” in The Green Knight Oath of Thorns comes from its Thorn Spins, a special feature that can activate during free spins. Other key mechanics include the Sword Meter and wild multipliers.
Sword Meter
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On any spin, the Sword Meter can apply multipliers to all wilds.
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Possible values: x2, x5, x10, x25, x100.
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If a multiplier wild is part of a win, the payout is multiplied by both the wild’s value and the Sword Meter multiplier shown above the reels.
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Multipliers are not cumulative on the same payline.
Free Spins
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Triggered by 3, 4, or 5 scatters in the base game, awarding 5 free spins plus payouts of 2.5x, 5x, or 100x the bet.
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During free spins, all wilds are multiplier wilds.
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The Sword Meter increases each spin, starting at x2 and climbing up to x100 by the final spin.
Thorn Spins
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Land 2+ scatters during free spins to trigger 5 Thorn Spins, along with their usual scatter payout.
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Thorn Spins lock in the current Sword Meter multiplier and guarantee 2–3 wilds per spin.
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No additional multiplier wilds or scatters can land during Thorn Spins.
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Once Thorn Spins end, any remaining free spins resume.
The Green Knight Oath of Thorns – Slot Verdict
The Green Knight Oath of Thorns delivers the same brand of straightforward, punchy gameplay that has defined the series, but by the third outing, a sense of diminishing returns is hard to ignore. The visual polish and sturdy simplicity remain intact, making it an easy fit for fans of the earlier games, yet the experience feels more like a comfortable rerun than a bold new chapter.
The formula hasn’t changed much—wild multipliers spark excitement in the base game, while the bonus round blends rising multiplier values with the chance to trigger free spins within free spins. The key twist here is Thorn Spins, locking in the current multiplier and guaranteeing wilds on each spin, which should appeal to loyal Green Knight players.
However, the downsides are notable. While the 14,000x max win is impressive, the odds of hitting it are daunting—about 1 in 1 billion, compared to roughly 1 in 55 million for the first game and 1 in 333 million for the second. That statistic alone may convince some players to stick with the earlier releases. Ultimately, The Green Knight Oath of Thorns is a well-made example of Play’n GO’s specialty, but time and repetition mean it struggles to match the impact of its predecessors.