The Green Knight Oath of Thorns: Slot Overview

In plenty of walks of life, loyalty is a prized quality, and in iGaming it’s not unusual to see studios latch onto a winning concept and stick with it. That may be putting it a touch strongly, yet software provider Play’n GO has clearly shown a knack for revisiting successful ideas through sequels and reworks. A good example is The Green Knight, launched in 2021 as a companion to The Sword and The Grail, then followed in 2023 by Return of the Green Knight and later The Sword and the Grail Excalibur in 2024—bringing us to 2025 and The Green Knight Oath of Thorns. As with earlier entries, the big moments come from lines of wild multipliers, plus a free spins within free spins mechanic.

Play’n GO’s ability to bring the scale of old-world tales—Arthurian Legends and the Green Knight story included—to the reels is obvious from the start. The studio has plenty of practice with this kind of theme, and The Green Knight Oath of Thorns is another good-looking addition. The base game unfolds in a lush setting of trees and greenery, and across the water—partly obscured behind the grid—sits what appears to be Camelot on a hill. It’s robust, heroic fare, and if a slot should feel like donning spiked gauntlets before taking on darkness, then thematically The Green Knight Oath of Thorns fits the bill.

“Hard-hitting” is a fair description of The Green Knight Oath of Thorns’ math model: it’s highly volatile and offers a maximum RTP of 96.27%. There’s a single way to approach it—pick a stake from 10 c to $/€100 and keep hammering the spin button. Every spin drops 15 symbols onto a 5×3 grid, with 20 paylines checking for winning combinations of 3 to 5 OAK.

Coloured stone symbols marked 10-A make up the low end of the paytable, returning 2x to 4x the bet for a 5-of-a-kind. Above those sit four character symbols, which pay 7.5x to 25x the bet for 5 OAK. When wilds appear, they can substitute for any standard paying symbol, and a five-wilds win on wild symbols alone is worth up to 100x.

The Green Knight Oath of Thorns: Slot Features

The “thorns” in The Green Knight Oath of Thorns point to Thorn Spins, which may activate while free spins are running. Alongside that, the game also includes a Sword Meter and wild multipliers.

Sword Meter

The Sword Meter can add multipliers to every wild that lands on any spin. The available multiplier values are x2, x5, x10, x25, and x100. If a multiplier wild contributes to a win, that win is multiplied by the value shown on the wild and the Sword Meter displayed above the reels. Multiplier wild wins do not stack on the same payline.

Free Spins

Landing 3, 4, or 5 scatters in the base game awards 5 free spins, plus a payout of 2.5x, 5x, or 100x the bet, respectively. During free spins, every wild that lands becomes a multiplier wild. The Sword Meter progressively increases its multiplier each spin, starting from x2 and rising up to the maximum of x100.

Thorn Spins

Hitting 2 or more scatters in free spins grants their usual payout, and also triggers 5 Thorn Spins. Thorn Spins run with the current Sword Meter value locked in, and each one delivers 2 to 3 guaranteed wilds. No extra multiplier wilds can appear, and scatters do not land. Once Thorn Spins end, the free spins round resumes if any spins are still left.

The Green Knight Oath of Thorns: Slot Verdict

The Green Knight Oath of Thorns delivers a dependable take on this straightforward, hard-hitting style of play, though a sense of diminishing returns did surface while working through the third Green Knight entry. On the plus side, it keeps the appealing presentation and chunky simplicity the series has shown before, and anyone who enjoyed earlier Green Knight titles should slide into The Green Knight Oath of Thorns with ease to revisit the familiar mechanics and its expected variation.

The downside is that The Green Knight Oath of Thorns often feels like more of the same, without many genuinely fresh surprises. A lot has changed in online gambling since 2021, and at times The Green Knight Oath of Thorns can seem a little behind the curve. As previously, wild multipliers inject energy when they show up in the base game, while the bonus round blends a climbing multiplier with the chance—if fortune cooperates—of landing free spins within free spins. It’s a potent combination, but on the third outing it’s solid rather than magical. That said, The Green Knight Oath of Thorns does bring a twist: each Thorn Spin guarantees multiplier wilds using the current multiplier level. In fairness, it’s a tempting concept that should appeal to Green Knight fans.

Less appealing is that although the max win is a respectable 14,000x, The Green Knight Oath of Thorns has easily the weakest max win probability of the three. Where part one offered around a 1 in 55m chance, part two roughly 1 in 333 million, The Green Knight Oath of Thorns drops to 1 in a billion—and that figure alone may be enough to push some players toward the earlier games. Overall, The Green Knight Oath of Thorns is another strong example of the kind of slot Play’n GO is known for, but with time passed and repetition setting in, it doesn’t land with quite the same impact as its siblings.