Buffalo's Sun 2 Slot by Zillion Games

Bonus coins collect passively during base play whether they form part of a winning combination or not. Each sun coin that lands sends a pulse of light into the logo above the reels, ticking up an accumulation counter. Every five coins banked, one random position on the grid transforms into an additional bonus symbol - and if that push gets you to six total, the Hold N Ring round opens without needing to land them naturally. It's a slow-burn safety net that keeps dead spins from feeling completely empty, and it makes the 100x buy option for Hold N Ring less of a necessity than it would be otherwise.

Hold N Ring locks all triggering sun coins in place, each stamped with a multiplier value - anything from low single digits up to 50x. Remaining positions respin, and each new coin resets the counter. Four jackpot tiers can appear as named symbols among the numerical coins: Mini at 24x, Minor at 30x, Major at 100x, Grand at 1,000x. Fill every one of the 24 grid positions and the Grand pays automatically. The buffalo theme slots from Zillion all share this structure, but the 6x4 grid here gives you more positions to fill than the original's 5x3 - harder to complete, bigger ceiling when it happens.

Free spins run on a different mechanic entirely. Three dreamcatcher scatters open 8 spins, scaling up to 50 if all six land (the 100x buy option drops you straight in). Golden buffalo wilds appear during the feature and walk - they shift to random reel positions between each spin rather than staying locked. A walking wild that drifts onto reel 3 or 4 where the animal symbols cluster is where the bigger free spin hits come from, since those reels carry the most connecting paths across 4,096 ways. Retriggering adds more spins on top. Warm canyon light washes across the grid during base play, purple-to-orange gradient sky behind brown rock formations, with detailed animal portraits - puma against red, bear against blue, eagle on purple, wolf on green - sitting inside a cream-toned reel area. Buffalo's Sun 3 later expanded the series further, but this middle entry already has enough going on between the two bonus modes and the accumulation system feeding into one of them.