Time Travel Tigers

Yggdrasil built Time Travel Tigers around Dr Tigerstein, a striped inventor who glances at his pocket watch beside a reel frame disguised as a time machine. Swinging pendulums, blinking bulbs and turning cogwheels move quietly behind the reels.

Wins form on a 5x3 layout with 25 fixed paylines. Nine regular symbols fill it. Card suits make up the four cheap ones, and the remaining five premiums stand for different periods of history: zap guns, potion vials, shields, scarabs from Egypt and stone-age tools. Of these, the prehistoric tools pay best, at 6x the stake for a five-symbol line. The wild replaces everything apart from the scatter.

The main event is the free spins. Three or more scatters throw the doctor into one of four eras picked at random, and every era changes how wilds arrive and applies a fixed multiplier to each winning spin.

Egypt drops 1 to 20 diagonal wilds on every spin under a 4x multiplier, with 3 or more scatters granting 6, 12 or 18 spins. The medieval era brings 4 to 20 cluster wilds and a 3x multiplier, worth 7, 14 or 25 spins. In the prehistoric era, 1 to 20 adjacent wilds land together beneath a 5x multiplier, and the spin counts are 5, 10 or 15. The future era scatters 1 to 20 wilds at random with a 2x multiplier, but hands out the longest rounds: 12, 24 or 36 spins.

Time Travel Tigers returns 96.3% over the long run. Its volatility rating is 7.1 out of 10, which Yggdrasil frames as medium to high, and the top prize is 3,104x the stake. Wagers start at 0.05 and reach 125 per spin.