If you've ever wanted a free spins round that refuses to end on schedule, Dr Jekyll Goes Wild hands you exactly that. It's a 2013 Barcrest title now flying under the Light & Wonder banner, built on a familiar 5×3 grid with 10 fixed paylines and a bet range that stretches from $0.10 right up to $500. Base RTP sits at 94.20% under $2 stakes, climbs to 96.20% above that, and reaches 98.20% if you commit to Big Bet mode. That 94.2% floor is a bit stingy by modern standards, sure, but the math does loosen up the more you wager.
Here's where things get interesting. Land three, four, or five Dr Jekyll portraits and you bank 10, 15, or 20 free spins. Standard stuff, retriggerable, nothing wild yet. Then a Jekyll Wild lands on reel 1, and the whole feature flips. Welcome to Hyde Spins: unlimited rounds, no spin counter, and a Hyde Wild that locks itself in place the moment it appears. Permanently. The board fills with sticky wilds as you go, and the only way out is a Sand Timer hourglass dropping onto reel 5. It spins, and the result either keeps Hyde alive or kicks you back into ordinary Jekyll Spins (which, remember, still have leftover counts to play out). Is the randomness of that hourglass a little brutal? Yeah. But that's also the whole point.
So a sleepy 10-spin trigger can balloon into a long locked-wild marathon, then settle back into the original feature for a clean exit. The green Jekyll portrait is also a base-game Wild, subbing for everything except bonus symbols.
For higher rollers, Big Bet mode runs at warmest math (98.20% RTP). It's five linked spins at a fixed higher stake, and you pick a tier: Standard, Super, Mega, or Ultra. Jekyll symbols in view push the Dr Jekyll Trail forward, and where you finish combined with what you paid in decides your free spin haul. Up to 75 spins are possible.
Visually it nails the Stevenson mood. A foggy London street after dark, gas lamps glowing amber against deep blues and greens, brick townhouses crowding in, and a neon-piped pharmacy front framing the reels. Symbols include a bubbling test-tube rack, a lit lantern, Big Ben under a full moon, and royals trailing wisps of green vapour. Max win caps at 2,500x your stake.