1spin4win Unveils Sound of Steel Hold and Win, the Next Chapter in Its Japanese Slot Series
1spin4win has expanded its growing Japanese-themed portfolio with Sound of Steel Hold and Win.
LISTEN TO THIS ARTICLE:This is the fourth title in its connected series and the latest release to secure an exclusive prerelease window with Royal Partners casinos. The launch underscores rising operator interest in multi-chapter slot collections that combine familiar mechanics with evolving stories and recurring characters.
After sending players across treacherous seas in Book of Corsairs, 1spin4win now turns its attention to ancient Japan with a chapter that pushes its long-running storyline into a decisive showdown.
The studio’s Japanese series has built a following by offering something rarely attempted in conventional slot lineups: narrative and visual continuity across multiple games. Each chapter advances an overarching storyline, introduces new characters, and deepens the conflict between returning figures. The approach has helped distinguish 1spin4win in a saturated market, giving players a sense of progression that extends beyond individual spins.
Shoguns, Ninjas, and High-Impact Slot Features
Sound of Steel Hold and Win moves the saga into its most intense chapter yet. The long-running feud between shogun Masahide and ninja Koniro escalates when the shogun seizes Tomoko-hama, the geisha whose fate has threaded through earlier titles. Their confrontation comes to life in the game’s Bonus round, powered by the Hold and Win mechanic that anchors all four releases in the collection.
The Hold and Win feature continues to be a strong draw for players attracted to jackpot-style rewards. In this instalment, the Bonus round offers two trophy coins: a x100 Minipot and a x1,000 Megapot, both available during the battle sequence. The mechanic’s popularity has helped sustain interest in the series, delivering the anticipation of a major payout while maintaining straightforward gameplay.
While previous games in the collection leaned on more traditional layouts, Sound of Steel Hold and Win introduces a 3×3 grid, a maximum x1,500 multiplier, and expanded Wild functionality to support winning combinations. One of the most notable additions is the Buy Bonus option, which lets players jump directly into the Hold and Win round without waiting for a trigger in regular play.
Despite the layered narrative and an expanded set of features, 1spin4win has kept the gameplay accessible. The studio’s design philosophy focuses on simple mechanics supported by high-quality mathematics, an approach that has helped cultivate a stable audience across its library of more than 180 classic slots.
Olga Bogdanova, Art Director at 1spin4win, said the studio worked to heighten both atmosphere and character development in this release.
Sound of Steel Hold and Win is another proud addition to our special Japanese game collection. Through a carefully crafted combination of art, animation, and unique mechanics, we were able to convey the characters’ confrontation and intensify the game’s atmosphere”
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About 1spin4win
Founded in 2021 by industry veterans with more than 15 years of experience, 1spin4win has positioned itself as a fast-growing supplier focused on transparent mechanics and balanced gameplay. The company plans to release an average of four new titles each month throughout 2025 and continues to expand promotional tools for operators seeking higher retention and loyalty.
With its latest instalment, the studio strengthens its foothold in story-driven slot development and adds another chapter to a collection designed to keep players immersed in an evolving vision of ancient Japan.
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