RTP stands for Return to Player. It is a percentage that shows how much of all money wagered on a slot is paid back to players over a very large number of spins — typically millions.
A slot with 97.0% RTP returns, on average, ৳97 for every ৳100 staked across all players combined. The remaining 3% is the house edge. This is a long-run mathematical average, not a session guarantee.
At b7b7, you can check each game's RTP inside its info panel before placing a bet. Games from providers like Pragmatic Play, Playtech, and PG Soft publish verified RTP figures. The highest-RTP slot in the b7b7 lobby right now is Monster Mine at 97.8%.