Quick verdict: Danger High Voltage is Big Time Gaming's 2017 disco-rock slot, built around an early-2000s rock anthem and offering something most slots from that era didn't: a genuine choice between two completely different free spins formats. It runs on a 4,096 Ways grid, and rather than one fixed bonus round, you pick between a straightforward multiplier-stacking format and a riskier, higher-ceiling sticky-symbol format. At 95.67% RTP and medium-high volatility, it's a slot for players who like having some say in how their bonus round plays out.
The Story
Big Time Gaming released Danger High Voltage in early 2017, building the entire game around an early-2000s rock song of the same name that had become something of a cult favourite on dancefloors and in adverts. Rather than a loose theme tie-in, BTG built the whole presentation — symbols, lighting, the escalating soundtrack during free spins — as a direct homage to the track, aiming to land with players who remembered the song as much as slot fans discovering it fresh. It's a disco-meets-rock-star aesthetic: sugar skulls, playing cards and disco balls sit alongside the neon "Danger High Voltage" signage that gives the game its name, all wrapped in BTG's early Ways-based mechanics before the studio's own Megaways engine came to dominate its later releases.
Theme, Gameplay & Symbols
Danger High Voltage runs on a 6-reel grid offering 4,096 Ways to win — every position on every reel can combine with adjacent positions on the next, without fixed paylines to track. Low-paying symbols are the standard 9 through A playing-card royals; higher-paying symbols include a sugar skull, a spinning disco ball, a taco, a bell and a "My Desire" heart-scroll icon, all rendered in the game's bright, neon-lit style. Two Wild types feature: a standard Wild that substitutes for all paying symbols, and — during one of the bonus rounds — a full-reel Wild carrying its own escalating multiplier value.
Presentation & Sound
Visually, Danger High Voltage leans into a "rock star tattoo meets disco floor" aesthetic — a brushed-metal reel frame with a neon lightning-bolt logo above it, a flashing disco-tile backdrop, and lighting effects that pulse in time with the game's audio. It's a 2017-era production, so don't expect the layered animation of BTG's more recent titles, but the lighting and colour work still give it a distinct look compared to most slots from the same period. The soundtrack is the game's real signature: an escalating rock-disco backing track tied to the theme song, with more of the tune unlocking the further into a free spins round you get — a nice touch that rewards longer bonus rounds with more of the track rather than looping the same short clip throughout.
How to Play Danger High Voltage
- Set your stake using the bet selector. Availability and exact stake limits depend on the operator, so check the in-game panel before you play.
- Spin the 6-reel grid. Wins pay across up to 4,096 Ways when matching symbols land on adjacent reels starting from the leftmost reel.
- Land the required Scatter combination to trigger the bonus round, then choose between two free spins formats: High Voltage Free Spins or Gates of Hell Free Spins.
- In High Voltage Free Spins, watch the reel-length multiplier ladder build with each Full Reel Wild that lands, up to a published cap of x66.
- In Gates of Hell Free Spins, watch for the Massive Symbol reel selecting a Sticky Symbol from the pay table — this symbol stays locked in place for the rest of the round, and landing more fire-reel triggers extends the round further.
- Both rounds support retriggers, so a strong run can extend well beyond the initial free spins awarded.
Features & Mechanics
Danger High Voltage's headline feature is its Player Choice Double Feature: landing the bonus trigger doesn't lock you into a single free spins format — it opens a choice between two structurally different rounds. High Voltage Free Spins awards 15 free spins built around Full Reel Wilds, each carrying its own multiplier value that climbs on a ladder — Big Time Gaming's own promotional material shows the ladder running from x1 up to x66 — with unlimited retriggers keeping the round alive as long as new Bonus symbols keep landing.
Gates of Hell Free Spins takes a different approach: it opens with just 7 free spins, but a Massive Symbol reel selects a Sticky Symbol from the pay table that then stays locked in position for the remainder of the round, while a dedicated fire-reel retrigger mechanic can extend the round up to 19 free spins in total. It's the higher-risk, higher-ceiling option of the two — fewer starting spins, but a sticky symbol mechanic that can compound quickly if the right value gets locked in early. Choosing between the two rounds is a genuine strategic decision rather than cosmetic — High Voltage Free Spins offers steadier, more predictable multiplier growth, while Gates of Hell leans on the sticky symbol snowballing for its biggest results.
Volatility & Win Potential
Big Time Gaming's own technical data sheet lists Danger High Voltage's RTP at 95.67%, with a base game exposure of 10,800x stake and a maximum exposure of 15,746x stake. The same sheet rates volatility as medium-high — a level that fits a game offering two distinct free spins formats rather than one fixed bonus, since the choice between them lets players lean slightly toward steadier or spikier outcomes depending on which round they pick. As with most Big Time Gaming titles from this era, individual operators can run different configurations, so check the in-game info screen at whichever site you play rather than assuming the published figures apply everywhere.
Pros & Cons
- Pro: The Player Choice Double Feature is a genuinely meaningful decision, not a cosmetic option — the two free spins rounds play very differently.
- Pro: A distinctive theme with a real soundtrack hook, executed with more commitment than most slot-and-song tie-ins from the same period.
- Pro: Both bonus rounds support retriggers, giving strong runs real room to extend well past their starting spin count.
- Con: A 2017-era production — the presentation is solid for its age but dated next to Big Time Gaming's more recent releases.
- Con: Medium-high volatility with a 15,746x max exposure means this isn't a slot for players chasing frequent, steady returns.
- Con: Two different bonus formats to learn adds a bit more upfront complexity than a slot with a single bonus round.
Final Verdict
Danger High Voltage still stands out nearly a decade after release for genuinely committing to its Player Choice Double Feature — High Voltage Free Spins and Gates of Hell Free Spins are different enough in structure and risk profile that picking between them actually matters, rather than being two reskins of the same mechanic. Layered over a distinctive disco-rock theme with a real soundtrack payoff, it's a slot that rewards players who enjoy a bit of pre-bonus decision-making alongside their spins. At 95.67% RTP and medium-high volatility, it won't suit anyone after frequent small wins, but for fans of Ways-based mechanics with genuine feature variety, it's held up better than most of its era. Worth a spin via the free demo below to see which of the two free spins formats suits your style before wagering anything for real.
