Mysterious

Mysterious is a 4x4, 256-payline slot from Pragmatic Play set in Victorian London. 96.50% RTP, high volatility (5/5), 9,648x maximum win. The base game runs four reels across four rows with 256 fixed paylines. Three character-based wild types cycle through gameplay: the Lord's multiplier wild, the Lady's mystery symbol, and the Baron's infectious wild that spreads to adjacent positions.

The free-spin round expands the grid to six reels and 4,096 ways to win — a structural upgrade that doubles the reel count and eliminates fixed paylines in favour of ways. Players choose their free-spin modifier at the trigger: Locking Multiplier Free Spins apply a random 3x, 6x, 9x, or 12x multiplier locked for every spin when the clock symbol lands, with two clock symbols awarding three consecutive locked-multiplier spins. Roaming Wild Free Spins place moving wilds that shift position each spin, extending their coverage across the expanded 4,096-ways grid.

The 4,096-ways expansion during free spins is the defining structural moment — the grid more than doubles its winning combinations from 256 in the base game, and the chosen modifier applies across the full six-reel surface. A Locking Multiplier sequence at 12x during a 4,096-ways spin with strong symbol coverage is the path to the 9,648x cap.

The 9,648x ceiling is the highest in the Victorian-theme PP category and among the better values in the high-volatility range at 96.50% RTP. The grid expansion mechanic is the strongest structural differentiator — no other PP title flips from fixed-payline play to ways-to-win format mid-session. The base game is functional but thin; the 4,096-ways free-spin round with a chosen modifier is the entire reason to play.

Verdict
A 256-payline base game that expands to 4,096 ways during free spins. Choose your modifier, hit the expansion, and the 9,648x ceiling becomes accessible.