Lightning Storm by Evolution Gaming: headline RTP 97.44%, max win x10 000.
An RTP of 97.44% means a house edge of 2.56% — the expected cost is 2.56 units per 100 staked over the long run, whatever a single session does.
The advertised ceiling is x10 000. Max win figures describe the tail of the distribution, not a realistic target: on most games with a ceiling this high the probability per spin is below one in a million.
Against our catalogue the number is above the median of 96.13%, higher than 99% of the games whose RTP we verified. That comparison matters more than the raw figure, because "96%" only sounds generous next to nothing.
Features: Bonus Game.
Lightning Storm has a published RTP of 97.44%, a house edge of 2.56%. We have not yet found a casino serving it at a different RTP build.
Lightning Storm is a Evolution Gaming game, so the outcome is produced by the studio's certified RNG rather than by the casino, and it is not provably fair in the cryptographic sense — you cannot recompute a spin from a seed. What the casino does control is which RTP build it serves. That is the real variable, and it is measurable.