Book of 99 Slot - 99% RTP Greek Mythology Game

99%

RTP

Unprecedented 99.00% Return to Player

Book of 99 stands apart from typical slots with its exceptional 99.00% theoretical RTP, one of the highest in the industry. This ancient Greek-themed slot from Relax Gaming combines generous player returns with an innovative collection mechanic where every wild symbol brings you closer to triggering free spins.

5x3 Reel Grid

10 Paylines

1000x Max Symbol

99 Wild Target

10 Free Spins

Odyssey of Features

Collection Mechanic

Every wild symbol that lands in the base game increments your vertical collection meter. Gather 99 wild book symbols to automatically trigger free spins with a weighted average bet.

Collect 99 Wilds

Wild Book Symbol

The ornate golden book serves dual purposes: it substitutes for all regular symbols as a wild and acts as the scatter to trigger free spins when 3 or more appear anywhere.

Dual Function

Expanding Symbol

When free spins trigger, one of the nine regular symbols is randomly chosen to expand. Just 2 high-pay symbols or 3 low-pay symbols expand across the entire reel, paying on all 10 lines.

Pays All Lines

The Path to Ithaka: Collection Journey

Book of 99's signature mechanic transforms every spin into progress. The vertical stone pillar on the left tracks your odyssey from 0 to 99 wild symbols, with decorative labels referencing Greek locations like Ithaka and Macedonia.

Each wild book symbol adds 1 to your meter
Progress persists across gaming sessions
Reach 99 to trigger free spins automatically
Meter resets after free spins, overflow carries forward

Current Progress

0 Wilds 51 / 99

Premium Symbols & Payouts

Values shown as multipliers of your bet. All wins evaluated left to right on 10 active paylines.

Male Hero

5× 1000x
4× 200x
3× 20x
2× 2x

Female Prophetess

5× 400x
4× 80x
3× 8x
2× 1x

Cyclops

5× 150x
4× 20x
3× 6x
2× 1x

Dark Sorceress

5× 150x
4× 20x
3× 6x
2× 1x

Ace / King

5× 30x
4× 8x
3× 1x

Queen / Jack / Ten

5× 20x
4× 5x
3× 1x

How to Spin the Reels

1

Set Your Bet

Use the plus and minus buttons to adjust your wager. Available bets range from 20.00 to 100.00 credits in the demo version, with higher options available for real play.

2

Spin the Columns

Press the large circular spin button in the centre of the control bar. Enable quickspin mode with the double arrow button to reduce animation time between spins.

3

Land Winning Combinations

Match 3 or more identical symbols on any of the 10 paylines, starting from the leftmost reel. The golden book wild substitutes for all regular symbols to help complete wins.

4

Trigger Free Spins

Land 3 or more wild book symbols anywhere for instant 10 free spins, or collect 99 wilds via the meter. A random symbol expands during the bonus to pay scatter-style on all lines.

Strengths & Considerations

Game Strengths

Exceptional 99.00% RTP provides industry-leading theoretical returns
Innovative collection mechanic adds persistent progression
Two ways to trigger free spins: scatter method or collection completion
Expanding symbol pays on all 10 lines during bonus rounds
Retrigger possible with 3+ wilds awarding additional 10 spins
Immersive Greek mythology theme with detailed character artwork
Keyboard spacebar shortcut available for accessibility

Points to Note

Max win capped at 1000x on single symbol combination
Collection to 99 wilds requires significant volume of spins
Only 10 paylines compared to modern 243+ ways slots
Low-pay symbols need 3 to expand versus 2 for high-pay symbols
No progressive jackpot or multi-level bonus features
Classic volatility may not suit high-variance thrill seekers

Play Responsibly

Book of 99 is designed for entertainment. While the 99.00% RTP offers excellent theoretical returns, all outcomes are determined by certified random number generation. Set deposit limits, take regular breaks, and never wager more than you can afford to lose. If gambling stops being fun, seek help through responsible gaming resources.