RTP — return to player
RTP (Return to Player) is the share of all wagered money that a slot returns to players over the long term. An RTP of 95% means that for every 100 conditional units wagered, an average of 95 is returned over millions of spins.
The key phrase is "on average over millions." Over a short stretch, deviations are enormous. RTP is not a prediction of your session, but a property of the game's mathematics. That's why it's correctly measured by simulating 1 million+ spins: at 300 thousand, tail variance (rare big wins) still distorts the estimate.
Volatility — payout pattern
Volatility (variance) describes the spread. Low volatility means frequent small wins and a steady balance. High volatility means long dry streaks but rare big hits.
Two slots with the same RTP of 95% can feel completely different: one trickles out small wins, while the other stays silent and then pays out everything at once. Megaways and cascade mechanics usually lean toward high volatility.
How do developers manage this?
RTP and volatility are configured via virtual reel weights: the same set of symbols with different weights yields different return and variance — without inflating the reels themselves. This is vendor-level engineering, and that’s exactly what we expose in the admin panel as a calibratable parameter.
Any change to the math goes through a fail-gate: a simulation of 1 million spins must confirm the target RTP within ±1.5 p.p., otherwise the change does not go to production.