Serpent King

Red Tiger frames Serpent King as a jungle follow-up to its earlier Primate King releases, swapping the primate for a clawed, blue-eyed serpent creature that prowls a torch-lit ruin. The core mechanic carries over too: an upgrading wild and a reel that only opens once enough progress has been made.

The grid holds six reels at four rows each, though the sixth stays locked until three separate upgrades have been earned; card-suit low symbols cannot land on it once it opens. Thirty fixed paylines pay from the left, with clubs, diamonds, hearts and spades as the low-value icons, while a necklace, a potion bottle, a skull, and a treasure chest form the premiums, the last of which can only complete a six-of-a-kind line once the extra reel is active.

Gold Coins can land in the corner of any symbol while wild upgrades remain available, and landing one alongside the Serpent Wild feeds a progress bar: 30 coins unlocks the first upgrade, 60 the second, and 90 the third. The first upgrade enlarges the Serpent Wild to cover a full reel; the second attaches a random multiplier of x2, x3 or x5; the third turns it into a locked wild that stays put through consecutive wins, adding +1 to its multiplier each time, before releasing on the next non-winning spin, and if it sits unused on the fifth reel for too long it can shift to one of the first four reels instead. Once all three upgrades are unlocked, the progress bar itself becomes the sixth reel.

A Multiplier Stone banks a Serpent Wild's multiplier whenever it lands without producing a win, holding the value until the wild reappears and reclaims it. Serpent Respins work in a similar spirit: if the wild lands with no win, one symbol type on the grid is highlighted and locked, and the reels respin repeatedly for as long as fresh matching symbols keep appearing, with only that symbol's winning lines paid out once the run ends.

The math model here is rated high volatility, with a maximum win of 12,825x the stake. Bets span 0.10 to 6 per spin, and the RTP is set at 95.7%.