Book of Ra™ Deluxe — Buy Bonus is an exciting 5×3 video slot developed by Greentube (NOVOMATIC), featuring the classic book-style mechanic that players love. With 10 fixed paylines, expanding special symbols during Free Games, and an optional Buy Bonus where allowed, this game is designed to thrill. The math model is high volatility, with reported configurations including a Buy Bonus variant at approximately 92.13% RTP and a reference Deluxe build around 95.10% RTP. The maximum win for the Buy Bonus variant is reported to be around 6,422× the total bet, with some Deluxe references citing wins of up to 10,035×.
Quick facts
| Title | Book of Ra™ Deluxe — Buy Bonus |
| Studio / Author | Greentube (NOVOMATIC) |
| Platform | HTML5 |
| Release date | 2024-11-01 |
| Layout | 5 reels × 3 rows, 10 fixed paylines |
| Win direction | Left-to-right (adjacent reels) |
| Volatility | High |
| RTP (Buy Bonus variant) | 92.13% (reported) |
| RTP (Deluxe reference) | 95.10% (reference) |
| Hit frequency (reference) | ~0.28–0.29 per spin |
| Max win (Buy Bonus variant) | ~6,422× total bet (reported) |
| Max win (Deluxe reference) | ~10,035× total bet (reference) |
| Play modes | Demo, Real money |
| Devices | Desktop, Mobile, Tablet |
Betting & parameters
| Min bet | 0.10 credits per spin |
| Max bet | 400.00 credits per spin |
| Config note | Operator-configurable |
Win rules
- Wins are awarded for 3 or more matching symbols on consecutive reels starting from the leftmost reel; certain premium symbols also pay for 2-of-a-kind.
- Only the highest win per payline is paid; wins on different lines are summed together.
- The Book symbol serves as both Wild and Scatter: it substitutes for pays and can trigger Free Games with scatter pays.
Symbols and top pays
Premium symbols
| Symbol | Top payout (5 of a kind) | 2-of-a-kind pays? |
|---|---|---|
| Explorer | 5,000× line bet | Yes |
| Pharaoh’s Mask | 2,000× line bet | Yes |
| Statue / Idol | 750× line bet | Yes |
| Scarab Beetle | 750× line bet | Yes |
Low symbols
| Symbol | Top payout (5 of a kind) |
|---|---|
| A | 150× line bet |
| K | 150× line bet |
| Q | 100× line bet |
| J | 100× line bet |
| 10 | 100× line bet |
Special symbol
| Symbol | Type | Scatter pays |
|---|---|---|
| Book of Ra | Wild + Scatter | 3 = 2× total bet; 4 = 20× total bet; 5 = 200× total bet |
Free Games & expanding symbol
Landing 3 or more Book of Ra symbols awards 10 Free Games. Before the bonus begins, one regular pay symbol is randomly selected as the Special Expanding Symbol. When enough of that symbol appear to form a win, all instances expand to cover their reels and pay across all lines regardless of adjacency. The bonus can retrigger with 3 or more Books, adding +10 spins each time. The same expanding symbol remains for the entire round.
| Trigger | Initial spins | Retrigger | Expanding symbol |
|---|---|---|---|
| 3+ Book scatters | 10 | +10 spins per retrigger (no listed limit) | Randomly selected from paytable symbols |
Buy Bonus & other features
Buy Bonus
Where permitted, an optional purchase allows instant access to the Free Games round. Price and availability depend on jurisdiction/operator. Configurations for Buy Bonus builds may feature a reduced RTP (e.g., ~92.13%).
Gamble (Red/Black)
An optional post-win gamble may be available to double your winnings by guessing the card color. This feature can be disabled based on market regulations or operator settings.
Math model (from provided data)
| Parameter | Value | Notes |
|---|---|---|
| Reels / Rows / Paylines | 5 / 3 / 10 | Fixed paylines |
| Win direction | Left-to-right | Adjacent reels |
| Volatility | High | Categorical scale |
| RTP (Buy Bonus) | 92.13% | Reported configuration |
| RTP (Deluxe reference) | 95.10% | Reference configuration |
| Hit frequency | 0.28–0.29 | Probability per spin (reference) |
| Max win (Buy Bonus) | ~6,422× | Reported variant |
| Max win (Deluxe reference) | ~10,035× | Reference value |
| Bet range | 0.10 – 400.00 | Credits per spin; operator-configurable |
Internal state (overview)
- Selected Expanding Symbol: Randomly chosen at bonus start; persists for the round.
- Free Games Counter: Starts at 10; retriggers add +10.
- Buy Bonus Flag: Indicates entry via purchase (if enabled).
- Gamble Availability: Regulator/operator toggle.
- Scatter Counter: Tracks Books per spin for trigger/scatter pays.
Disclaimers
- Symbol wins use the line bet; Book scatter payouts use the total bet.
- RTP is configurable by market/operator; Buy Bonus variants may use reduced RTP.
- Buy Bonus and Gamble features may be disabled depending on jurisdiction.
Responsible play
This game is intended for adult players. Outcomes are determined by random number generation, and no strategy can alter the odds. We encourage players to set personal limits and take regular breaks.