The Hold and Win bonus triggers when six Moon bonus symbols land at once. Alternatively, five Moons plus one Boost symbol will also activate it. When triggered, the grid locks all Moon symbols in place for three respins. If another bonus symbol appears during the respins, the counter resets to three. Occasionally, a Boost symbol lands, immediately grabbing every cash value present on the board. This synergy defines the core bonus flow.
Hold and Win slots concentrate a significant portion of their long-term RTP inside bonus rounds. Players who never trigger the feature experience disproportionately low short-term returns, which can feel discouraging but is mathematically expected. - Black Wolf Hold and Win mechanics overview, independent slot reviews, 2024. slotcatalog.com
During the Hold and Win round, Mystery Moon Bonus symbols can appear. At the end of the feature, each Mystery symbol randomly transforms into one of the fixed jackpot tiers: Mini (20x), Minor (50x), or Major (100x). If the entire 5x4 grid fills with bonus symbols, the Grand Jackpot of 1,000x your stake is awarded. While the Grand Jackpot itself is exactly 1,000x, filling the board combined with base-game line wins can theoretically push the absolute maximum payout slightly higher, up to approximately 1,193x.
Worth noting: that theoretical ceiling is extremely rare. Do not plan around it.