Shield of Athena vs Book of Dead — which one to play

Both slots come from Play'n GO. Both feature Rich Wilde. Both run on a 5×3 grid with 10 paylines. But the math models are different, the bonus structure is different, and the player profiles each one rewards are different. If you are choosing between them as a single session, the answer comes down to whether you prefer steady mid-volatility variance with familiar mechanics, or a higher ceiling that punishes you with longer dry runs.

Specs side by side

Book of Dead launched January 2016. Shield of Athena launched May 2020 — four years later, and it shows in the math. Default RTP is nearly identical: 96.21% for Book vs 96.25% for Shield, both adjustable downward by operators. Both run high volatility, though the Play'n GO internal scale rates Shield at 10/10 against Book's 8-9/10 (Book's exact internal rating is not published, but most third-party tests place it slightly lower). The biggest spec difference is max win: Book caps at 5,000× the stake, Shield doubles that to 10,000×. At $1 stake, that's $5,000 vs $10,000. At $100 stake, $500,000 vs $1,000,000. The trade-off is variance — Shield's higher ceiling is paid for with longer dry stretches between meaningful wins.

Mechanic differences that matter

Book of Dead uses one big idea: a single random expanding symbol during free spins. When the bonus triggers (10 free spins, no scaling), Play'n GO picks one paying symbol at random. Whenever that symbol lands during the round, it expands to fill its entire reel. That's how Book of Dead reaches its 5,000× ceiling — one perfect expanding-Rich-Wilde session covering all five reels. Shield of Athena replaces the expanding symbol with the Medusa Re-Spin: a sticky-wild mechanic that can fire on any base-game spin, not just inside the bonus. During free spins, the Re-Spin stays active permanently, so the bonus round becomes a chain of locked wilds rather than a single expanding-symbol event. Shield also separates wild and scatter into two characters (Rich Wilde = wild, Cat Wilde = scatter), where Book of Dead uses the book symbol as both. Practical effect: in Book, you only chase the bonus through the book symbol. In Shield, the Shield itself can deliver substantial wins outside the bonus through Re-Spins.

Free spin scaling and re-triggers

Book of Dead awards exactly 10 free spins regardless of how many scatters trigger them. Re-triggers add another 10. Shield of Athena scales the initial award: 3 scatters give 10, 4 give 12, 5 give 15 — and re-triggers follow the same scaling. Both slots allow unlimited re-triggers, but Shield enforces a hard cap of 100 free spins per bonus session. In practice the cap rarely matters; reaching even 50 re-triggered free spins is statistically uncommon. Book also includes a card-color gamble feature after winning spins — guess red or black to double your win, fail and lose it. Shield removes the gamble entirely. That's intentional: Play'n GO has been phasing gamble features out of newer titles in regulated EU markets where the feature is restricted.

Which one to choose

Pick Book of Dead if: you want a familiar, well-tuned book-style slot with a single clear bonus mechanic; you prefer 10/10 volatility's slightly tamer cousin (still high, but more forgiving on dry runs); you like the gamble feature; or you simply want the original. Pick Shield of Athena if: you can absorb the higher variance for the higher ceiling; you prefer mid-game action via the Re-Spin (it can fire on any spin, including dead-looking spins, which keeps the base game more dynamic); you want the bigger character roster (Cat Wilde debuts here); or you specifically want a Greek mythology theme over Egyptian. For a 200-spin demo session, Shield is more visually engaging in the base game thanks to the random Re-Spins. For a 1,000-spin real-money session with a tight budget, Book of Dead's slightly tamer math model is the safer pick.

Where they sit in the wider Rich Wilde catalog

By the time Shield of Athena launched in May 2020, Play'n GO had already released four Rich Wilde slots: Aztec Idols (2013), Pearls of India (2016), Book of Dead (2016), and Tome of Madness (2019). Shield was the fifth, and the first to introduce Cat Wilde. Six years later, the franchise has expanded to 17+ titles and is still active — the Tome of Dead landed in April 2025 with a 5×5 cluster mechanic, Wandering City in February 2026 with 243 ways and a 10,000× ceiling that matches Shield's, and Book of Dead GO Collect in February 2026 to mark the original's 10-year anniversary. Most of those use the same RTP range (96.20–96.29%) and high volatility classification. Shield of Athena holds up well against the newer entries because its Medusa Re-Spin mechanic ages more gracefully than the older Tome of Madness cluster format. If you specifically want a 5×3, payline-based Wilde slot with a high ceiling, this is still the best entry in the franchise outside Book of Dead itself.