Dune Signal

5 reels × 3 rows, 243 ways, left to right. Winning symbols clear and new ones fall in; each cascade in a spin climbs 1× → 2× → 3× → 5×. Wilds land on the three middle reels.

In free spins, after each free spin that pays, the lowest low symbol still in play is retired for the rest of the feature: Switch first, then Fuse, then Valve. A cell that would show a retired symbol shows the lowest low still in play instead. Dial, the best low, is never retired. A feature of 10 free spins retires 2.9 of the three on average.

3, 4 or 5 scatters on the first drop of a spin award 10, 12 or 15 free spins; 3, 4 or 5 on a free spin add that many again, up to 60 free spins in all. The feature can be bought for 125.99× the bet with 10 free spins, for 174.89× with 12, or for 250.22× with 15. Each price is what those spins return on average, less the house's share: no tier is a better buy than another.

Bought, the three return 96.40%, 96.40% and 96.40%, as measured (each give or take 0.13 points at most); most buys return less than they cost.

When two scatters are in view, the reels still turning stop more slowly. That is decided only by the reels that have already stopped and happens every time two are in view, whether a third comes or not: it says nothing about what the turning reels will show.

One spin, feature included, pays at most 5,000× the bet: a spin that reaches it stops there and is paid exactly that.

The return printed here was measured, not derived: 96.39%, give or take 0.32 points, over 60 million spins. 36.5% of spins pay something; the free spins come about one spin in 171 and pay 76% of the return.