- RTP (Return to Player)
- The percentage of total wagers a slot returns over millions of spins. Book of Ra Deluxe has a default RTP of 95.10%, meaning $4.90 of every $100 goes to the house long-term.
- Volatility
- A measure of payout frequency and size distribution. High volatility (Book of Ra Deluxe's rating) means wins come less often but tend to be larger. Most returns concentrate in the bonus round.
- Scatter
- A symbol that pays regardless of payline position. The Book of Ra is a scatter — three or more anywhere on the grid trigger 10 free spins.
- Wild
- A symbol that substitutes for others to form winning combinations. In Book of Ra Deluxe, the Book symbol is both wild and scatter simultaneously.
- Multiplier
- A factor applied to winnings. Free spins in Book of Ra Deluxe carry a 2× multiplier, doubling all payouts compared to identical base game wins.
- Free Spins
- Bonus rounds played at no additional cost. Book of Ra Deluxe awards 10 free spins when 3+ Book scatters land, with a special expanding symbol active throughout.
- Expanding Symbol
- A randomly selected symbol that covers all three positions on its reel during free spins. It pays on non-adjacent reels, which is unusual for payline-based slots.
- Hit Rate
- The percentage of spins that produce any win. Book of Ra Deluxe has a 30% hit rate — roughly 3 winning spins per 10.
- Paylines
- Fixed patterns across the grid where matching symbols must land to form wins. Book of Ra Deluxe has 10 adjustable paylines running left to right.
- Grid
- The reel layout. Book of Ra Deluxe uses 5 reels and 3 rows (5×3), displaying 15 symbols per spin.
- Gamble Feature
- A post-win mini-game where players predict a card color (red/black) to double their payout. Available up to 5 consecutive times per win.
- Autoplay
- Automatic spinning for a set number of rounds. The gamble feature is disabled during autoplay sessions.
- Max Win
- The highest possible payout from a single spin or bonus round. Book of Ra Deluxe's max win is 5,000× the total bet.
- Ante Bet
- An optional stake increase that improves bonus trigger odds. Book of Ra Deluxe does not have an ante bet feature.
- Cascade/Tumble
- A mechanic where winning symbols disappear and new ones fall in. Book of Ra Deluxe does not use cascading reels — it uses standard spinning reels.
- Bonus Buy
- A feature allowing instant purchase of the bonus round. Book of Ra Deluxe does not include bonus buy. A separate 'Buy Bonus' variant exists at limited casinos.