Sumo Sumo

A quiet side street stands in for the usual packed arena in Sumo Sumo, Elk Studios' high-volatility take on Japan's national sport, with the Speedboat Bonus alone shifting the action down to the water. The 5-reel, 3-row grid pays across 259 ways, with wins formed by matching symbols connecting outward from the leftmost reel, horizontally or diagonally rather than along a strictly straight line.

Blocky fruit make up the lower-paying symbols — cherries, grapes, lemons and watermelons — worth 0.5x to 2x the bet for five in a row, while two coloured sumo wrestlers sit above them as the premium pays, worth 5x to 10x for a full line. A standard wild substitutes for any of those paying symbols wherever it lands.

Wild Sumo Stacks are the base game's core mechanic: matching sumo symbols merge into a single stacked wild carrying a multiplier equal to how many symbols combined to form it, and that multiplier applies to any win it's part of. Every time a stack forms it triggers a respin and shifts one position across the reels, reversing direction once it reaches either edge; a respin producing neither a win nor a new stack ends the sequence. When two opposing stacks land on the same row during a respin, a Brawl breaks out — the stack with the larger multiplier wins, multiplying its own value by the loser's before continuing on its path, with a random outcome deciding ties.

Three Speedboat Bonus symbols launch a separate round played across three spins on an expanded board, where a Speedboat token collects value from whatever it can see in a straight line from its position. Swimmers add their value directly, Wakeboarders attach to the boat and grow with every move it makes, Ramps multiply the boat's running total, and Harpoonists boost the value of symbols still waiting to be collected — with the Turbo version doing this on every subsequent collection rather than just once.

Two scatter symbols award 6 Free Spins, during which any Wild Sumo Stacks already on the board stay in place between spins instead of dropping off after a loss; landing further scatters during the round adds another 6 spins on top of that. An X-iter menu lets the stake be spent buying straight into a specific mode instead of spinning for it — better odds at the bonus features for 5x the normal bet, an assured Brawl for 10x, the Speedboat Bonus outright for 50x, an all-Turbo-Harpoonist version of it for 100x, or an assured Free Spins round for 500x.

The maths behind all of this land at an RTP of 94%, high volatility, a 25,000x maximum win, and bets ranging from 0.20 to 100 per spin.