Variance and RTP are independent. Two games can return the same 99% on average while one moves your balance gently and the other in violent jumps.
Example - Plinko [risk levels](/plinko/risk-levels). On the same board, Low risk pays something near 1× on most slots: small, steady results, low variance. High risk pays little in the middle and huge amounts on rare edge slots: long dry spells, rare big hits, high variance. RTP can be nearly identical.
What high variance means in practice:
- Short sessions tell you almost nothing about the table.
- Session RTP can sit far from theoretical RTP for thousands of bets.
- Drawdowns are deeper and risk of ruin is higher for the same bankroll.
- The median session ends below the mean.
In ProvablyHero tools
Watch session vs theory in the demo; compare risk levels in the simulator.