Book of Time

Book of Time belongs to the most heavily populated sub-genre in modern slots, the book game, and Hacksaw Gaming's December 2022 entry is distinguished less by its dressing than by the board it plays on. The grid is five reels of five rows each, twenty-five positions in total, which is unusually tall for the format: book titles have historically sat on three-row cabinets, and the extra height changes how the screen reads, with far more symbols in view at once and more room for a single reel to fill with the same icon. Twenty paylines are drawn across that space, so the lines do not expand to match the positions and much of the grid serves as depth rather than as additional ways to win.

Two features are on offer. A free spins round provides the bonus, in keeping with the conventions of the sub-genre, and a bonus buy is available for anyone who would rather pay directly for entry than wait for it. The buy option is worth noting for what it signals about the shape of the game: studios fit bonus purchases to titles whose return is concentrated in the feature, because the base game alone is rarely the attraction. Hacksaw has built much of its reputation on exactly that structure, and Book of Time is recognisably part of that lineage.

The maths supports the reading. RTP is 96.13%, squarely within the expected band, and volatility is rated high with a maximum win of 10,000x stake. That ceiling on a twenty-five-position grid implies substantial top-end potential concentrated into infrequent outcomes, and the practical texture is the familiar high-variance pattern: extended quiet periods in the base game punctuated by the bonus, where most of the meaningful return is held. The cap is firmly in the modern bracket without reaching the six-figure multipliers some of the studio's later releases chase.

Bet levels run from 0.10 to 100 per spin, a conventional range that places the game in the mainstream of online stakes rather than at either extreme.

Approaching four years old, Book of Time now reads as a transitional release. It has the tall grid and the bonus buy that became standard in the years after, but it keeps the fixed-payline structure and the book framing that newer designs have largely traded for cluster mechanics and scaling multipliers. For anyone surveying Hacksaw's catalogue it is a useful marker of where the studio's house style was heading, and as a game it is a competent, high-variance treatment of a theme that was already crowded when it arrived.

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