It means the game includes two or more independent reel grids that spin in the same round; wins can come from one or more sets depending on the rules.
The RTP shown for the game reflects the overall return; multiple reel sets can affect volatility, but the published RTP accounts for the entire system.
Each reel set typically has its own paylines, and wins are calculated according to the active set rules; some games also allow cross-set or feature-driven wins.
Common features include free spins that switch between sets, sticky wilds across sets, and multipliers that apply to the overall spin.
They often increase volatility due to more ways to win and complex features, but exact volatility depends on the game design.
Yes, most titles with this feature are mobile-friendly and work well on smartphones and tablets.
Yes, many providers offer free demo mode so you can try the multi-set mechanics without risking real money.
Bet size usually covers the spin across the active sets; check the control panel and paytable to confirm how bets apply.