Captain Coil

Trail of the Serpent: Captain Coil Under the Hacksaw Banner

Captain Coil also appears in Hacksaw Gaming's own catalogue, credited to studio partner Bullshark Games — the same mutation-themed cluster slot built around a wild-trailing snake, just filed under the wider Hacksaw umbrella this listing runs from. Rather than repeating the theme breakdown, it's worth focusing on how the bonus round actually escalates, since that's where most of this game's genuine upside lives.

The base structure is a 6x6 cascading grid using cluster pays: land five or more matching symbols connected horizontally or vertically and the cluster explodes, triggering a cascade that drops fresh symbols in from above. It's a dark, science-mutation aesthetic throughout — neon green slime, syringes, brains, and electrified visual effects, backed by an intense, glitchy soundtrack that leans hard into the chaotic tone.

The dedicated bonus game, Trail of the Serpent, is triggered by landing three scatter symbols and awards 10 free spins with a guaranteed Snake Pod appearance on every single spin — a meaningful upgrade over the base game, where the snake shows up at random. During the feature, the snake starts at length one and grows every time it consumes a Food symbol, which only appears during bonus play and converts into a regular paying symbol before wins are calculated. Each additional scatter that lands during the round adds extra spins on top, while the Global Multiplier — which resets every spin in the base game — carries and builds progressively throughout the feature instead, stacking real weight behind the round's biggest outcomes.

RTP is listed at 96.3%, meaning the game is designed to return £96.30 for every £100 wagered across a large number of spins, and volatility is rated High. With reels and rows both confirmed at 6x6 and stakes running from 0.10 to 50 per spin, the numbers line up consistently with what's on offer elsewhere in the Bullshark-built version of the game, right down to the shared 15,000x max win ceiling.

What the Trail of the Serpent bonus round makes clear is that Captain Coil's base game is really just the setup — the guaranteed Snake Pod appearances, the growing serpent, and the progressively climbing Global Multiplier are where the 15,000x max win is genuinely built from. It's a feature-heavy design that rewards getting into the bonus round over grinding the base game for its own sake.

For players who enjoy cluster-pays mechanics with a strong sense of escalation once a bonus round kicks in, Captain Coil earns its keep here. As always, the smartest way to judge whether the Trail of the Serpent feature suits your taste is to run it in the free demo on johnessyslots before committing real stakes.