RNGs, RTP and House Edge
Online casino games are driven by a random number generator (RNG) — software that produces unpredictable, independent outcomes for every spin or hand. Reputable casinos have their RNGs tested by independent labs to confirm the results are genuinely random.
Return-to-player (RTP) is the percentage of all wagers a game pays back over the long run; a 96% RTP slot returns R96 for every R100 wagered on average. The flip side is the house edge — the casino's built-in margin. Both are long-run averages, so short sessions can swing far in either direction.
What This Means for Players
Because the house edge is permanent, no system beats it over time — the practical goal is entertainment with disciplined bankroll management. Choosing lower-edge games like blackjack and video poker stretches your money further. For bonus maths, see wagering requirements explained.
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