Open the in-game information
Launch the game and find help, rules, paytable or information. Record the exact title, provider and any version identifier alongside the displayed RTP. The game client is a stronger reference for that instance than a lobby thumbnail or a general category description.
Separate base and feature figures
Some games describe an overall theoretical return while others list different modes, jackpots or optional features. Read the note beside each number. A feature-buy configuration can use a separate mathematical model even though the artwork and title remain the same.
Do not turn RTP into a promise
A displayed percentage is calculated over a long horizon and includes the game's complete payout distribution. A short session can finish far above or below it. Use RTP to compare documented game versions, not to choose a spin that is supposedly due.
Capture a mismatch clearly
If the help screen and published game details disagree, save screenshots with the title, provider, percentage and date. Ask which configured version is active. Avoid estimating the answer from recent wins or losses, because session results cannot identify an RTP setting.