Slot features

A feature is a mechanic — what the game actually does mathematically. Megaways, Bonus Buy, Progressive Jackpot are features. A theme is the art and story wrapped around the mechanic — Egyptian, Irish, mythology. Two slots can share a theme but have different features, and vice versa.

Megaways is a patented mechanic from Big Time Gaming where the number of symbols per reel changes every spin. Most implementations produce up to 117,649 ways to win and tend toward high volatility. BTG licenses the engine to other studios (Blueprint, Pragmatic Play, Red Tiger, etc.), so you'll see Megaways titles from many publishers.

Bonus Buy lets you pay a fixed price — usually 50× to 100× your base bet — to immediately enter the slot's free-spin or bonus round, skipping the natural trigger. The round plays out identically; you're just front-loading the cost for the premium portion of the game. Bonus Buy is regulated out in some markets (notably the UK), so those versions won't ship the button even though the rest of the game is intact.

No. Progressive jackpots — Mega Moolah, Age of the Gods, Dream Drop and similar — are pooled across real-money wagers at licensed casinos. Demo mode shows the jackpot meter and the trigger animation so you can see how it works, but no prize is awarded.