Tool

Slots with more than one RTP version

64 games in this catalogue ship in two or more return percentages. Same reels, same features, different maths — and the casino picks which one you play.

A slot is certified once and then built several times over. The studio publishes a headline return percentage and, alongside it, a ladder of weaker configurations. Nothing visible changes: the symbols, the paytable, the bonus rounds and the artwork are identical. What differs is the probability table underneath, and the only place it surfaces is the return percentage printed in the game's own info panel.

Operators choose from that ladder when they license the game. Some take the top build as a selling point, others take a lower one and say nothing. This is a normal, disclosed part of how slots are distributed, not a trick — but it is disclosed to operators, not advertised to players, and that asymmetry is why this page exists.

The spread is wider than most people expect. Mental II runs from 96.06% down to 84.01%, a gap of 12.05 percentage points across 5 builds. Play'n GO applies the same five-rung ladder to nearly everything it makes, twelve points end to end. Hacksaw's Le Vampire carries the highest figure we hold, 97.57% — and also an 86.27% build, worth remembering when a lobby advertises only the first number. Narrow ladders exist too: Thor's Rage opens 95.68% and 95.67%, a hundredth apart.

In money, over 10,000 spins at €1 a spin, the expected cost of the weakest build ranges from about €547 to €1 599. Against the best build of the same game, the difference is the spread multiplied by €100 — roughly €1 205 on the widest ladder here. That is an expected value over a large sample, not a prediction for an evening: volatility, not RTP, decides what a few hundred spins look like.

What we cannot tell you is which casino serves which build. Neither studios nor operators publish it, we cannot verify it, and we would rather say so than guess. Checking the game's info panel after it loads is the only reliable method, and in some markets that screen has been removed. We record every version a studio publishes; matching versions to venues is a different question, and one nobody has answered honestly at scale.

Spread is the gap in percentage points between a game's best and worst published build. „Worst build“ is the expected cost of playing the weakest version for 10,000 spins at €1 — house edge only, before any variance.

Work out the difference for your own stake and spin count →

18+ only. Gambling can be addictive. Play responsibly. Free, confidential help: BeGambleAware and GamCare.