Secrets of the Amazon Slot by Playtech

The free spins here run on a multiplier that climbs one step at a time. It opens at 1x on the first spin, then 2x on the second, 3x on the third, and keeps rising for as long as the round lasts, so the fattest hits tend to land right at the end. Three or more moonflower scatters set it off, but not straight into spins. You first pick one of three flowers, and the one you choose reveals how many free games you get. More scatters in the trigger mean more spins to unwrap, which also means more room for that multiplier to stack up before the round runs out.

The Amazonian woman in the flower headdress does double duty. She stands in for every symbol except the moonflower, and any win she helps complete gets doubled on the spot, a small floating x2 popping up over the line. She's also the top payer on the board, so a full row of her both pays the most and doubles itself. Land that inside the free spins and the doubling stacks on top of the running multiplier.

The white moonflower marked SCATTER pays from anywhere rather than along a line, three of them already returning five times your stake. No jackpot hangs over any of this, and there's no way to buy into the bonus, so the flower pick is the only route in.

The reels sit open on a dense rainforest backdrop, symbols perched on real vine branches with no reel box around them. The animals are all photoreal: a black panther, a spotted jaguar, a tan cougar, a toucan, a white cockatoo, a coiled red snake, a rainbow chameleon and a red-eyed tree frog, with red heliconia flowers hanging in at the edges. It plays close to Amazon Wild, another Playtech jungle lines slot from the same era, with the doubling wild and that rising free-spins multiplier doing most of the heavy lifting.