River of Styx Slot by Pragmatic Play

Crossing Into the Underworld

River of Styx wraps Pragmatic Play's scatter-pays-plus-tumble formula in Greek mythology. The 5x4 grid sits against a dark water backdrop with Charon's boat drifting past, and the symbols lean into underworld imagery - crowns, gems, flames, and spirits. Ten symbol types share identical payouts: five of a kind pays 100 coins, four pays 40, three pays 10, two pays 3. Winning combinations count symbols anywhere on screen, no payline alignment needed.

The tumble mechanic clears winning symbols after each payout, drops survivors to the bottom, and fills gaps from above. Chains of tumbles build within a single spin until no new wins form. All accumulated wins pay after the sequence ends.

Multipliers That Stack

Free spins trigger when four or more scatters land anywhere. You get 10 spins, with three or more scatters during the bonus adding five more. During free spins, multiplier symbols appear on the grid alongside regular symbols. Each multiplier carries a random value: 2x, 3x, 4x, 5x, 6x, 8x, 10x, 12x, 15x, 20x, 25x, 50x, or 100x.

Here's the key detail: multiplier symbols stay visible through the entire tumble sequence. When the sequence ends, all active multiplier values add together, and the combined total multiplies the sequence's win. Three multiplier symbols showing 10x, 25x, and 50x produce an 85x multiplier on that sequence's payout. A single good tumble chain with the right multipliers on screen gets within range of the 4,986x cap.

Ante Bet and Buy Feature

Two bet modes change the entry math. Standard play at 20x bet multiplier (starting from $0.20) enables the buy feature at 100x your total bet. The ante bet at 25x (starting from $0.25, maxing at $125) doubles your chance of landing scatters but locks out the buy option. Purchase RTP is 96.60%, standard is 96.51%, ante is 96.49% - the differences are marginal.

Progressive Jackpots

Four progressive jackpots - Minor, Major, Mega, and Grand - trigger randomly at the end of base game spins. Higher bets increase the chance. When triggered, you pick items to reveal jackpot names until three match, awarding that tier. The jackpots use a contribution-based progressive system, so values fluctuate based on player activity.

Worth noting: jackpots only trigger during base game, not during free spins or bought features. So the ante bet and buy feature both bypass the jackpot mechanic entirely. That's a real tradeoff - the best path to big multiplier wins skips the jackpot path, and vice versa.

The Reskin Reality

River of Styx shares its exact math model with Rujak Bonanza (Indonesian food theme) and Rizk Bonanza (casino-branded candy theme). Same RTP tiers, same max win, same feature set. If you've played either of those, the only difference here is the visual wrapper. The Greek underworld aesthetic is the darkest of the three - more atmospheric than fruit salad, less playful than candy. Same engine, different paint.