Buffalo Stack n Sync

Buffalo Stack n Sync is a video slot from Hacksaw set on a grid of 5 reels and 4 rows with 10 fixed paylines. The game features a wildlife theme inspired by the Great Plains of North America, with animals such as buffalo, wolves, eagles, horses, and cougars. For the lower values, there are symbols with card values, while wild cactus symbols and flames from buffalo hooves act as scatters. The central mechanic of the game is Stack ’n’ Sync (often abbreviated to SNS): when an SNS symbol appears, the reel on which it lands is filled with a stack of 15, 30, 45, or 60 instances of a randomly selected symbol, and the player receives a respin. If more SNS symbols appear during the respins, those additional reels synchronize to the same symbol and extend the respin sequence.

When a full reel of buffalo symbols appears, this becomes a Stampede Reel, which brings a random multiplier that applies to all buffalo wins associated with that reel. If more than one Stampede Reel is active on a winning payline, their multipliers are added together. The game has two bonus rounds: landing three scatter symbols activates Free Spins (10 free spins) with an increased chance of SNS symbols and stacking high-value animal symbols; landing four scatter symbols activates Stampede Spins, where the reels consist only of buffalo symbols, SNS symbols, or non-paying skulls, and each SNS symbol adds extra buffalo symbols plus one extra free spin.

There is also a Bonus Buy feature in jurisdictions where this is allowed: players can pay to gain direct access to Feature Spins (which guarantee at least one SNS symbol per spin), Free Spins, or Stampede Spins, depending on which purchase option they choose. The slot offers high volatility and a maximum win potential of up to 10,000× the stake.

You can play it for real money.