RTP = Return To Player. It's the percentage a game is designed to pay back over millions of rounds. A 96% RTP slot keeps 4c of every dollar long-term, which is the house edge. Important bit: it's a LONG-run average, it tells you nothing about your next 20 spins. To find it, open the game, hit the little 'i' / info / paytable button - it's listed in there, usually near the rules.