What is Payline?
A line across the reels on which matching symbols must land to form a winning combination. Traditional slots have 1–25 fixed paylines; modern video slots can have hundreds or use 'all ways pays' or 'cluster pays' systems instead.
Related Terms
Cluster Pays
A slot mechanic where wins are formed by clusters of matching symbols (typically 5 or more adjacent symbols) rather than traditional paylines. Common in games with grid layouts.
Megaways
A patented slot mechanic developed by Big Time Gaming (BTG) where the number of symbols on each reel changes randomly on every spin, creating up to 117,649 ways to win. Licensed to many other developers.
RNG (Random Number Generator)
The software algorithm that generates genuinely random outcomes for every spin, card draw, or dice roll at an online casino. All UKGC-licensed casinos must use independently certified RNGs to ensure games cannot be manipulated.
RTP (Return to Player)
The theoretical percentage of all wagered money a game pays back to players over an infinite number of rounds. A slot with 96% RTP returns £96 for every £100 wagered on average. The inverse of the house edge.