Moon Princess Slot by Play'n GO

A 5x5 Grid That Empties Instead of Refilling

Moon Princess slot by Play'n GO landed in July 2017 and quickly became one of the provider's three flagship titles alongside Book of Dead and Reactoonz. The concept is deceptively simple: a 5x5 grid, no paylines, and wins formed by matching 3 or more identical symbols in a horizontal or vertical row. But the twist that makes everything click is what happens after a win. Symbols vanish, the rest drop down, and nothing new fills the gaps from above. The grid slowly empties, and that is the entire point.

Each cascade bumps a progressive multiplier by 1x, climbing as high as 20x. Clear all 25 positions and you trigger Free Spins. It sounds straightforward on paper. In practice, it creates a snowball effect where one modest win can spiral into a full grid wipe worth thousands of times your bet.

Three Princesses, Three Rescue Powers

The game features three anime-styled princesses inspired by the magical girl genre, each tied to a distinct gameplay ability called Girl Power. Princess Love transforms one complete set of symbols into another type. Princess Star drops up to 2 Wild symbols onto random positions. Princess Storm destroys two entire symbol sets from the grid at once.

Girl Power activates randomly on non-winning spins during base play. This is what keeps dead spins from feeling truly dead. The active princess rotates after each trigger, so you cycle through all three powers naturally. Storm tends to be the most dramatic, wiping large chunks of the grid in one shot, while Star's Wild placement often sets up chain reactions on the next cascade.

Princess Trinity

A three-segment Power Meter sits beside the grid. It fills only from princess symbol wins: a 3-symbol match fills one segment, 4 symbols fill two, and 5 fill all three. Complete the meter within a single spin sequence and you get one bonus round where all three princesses fire their powers in succession. Love transforms, Star adds Wilds, Storm clears. The result is often a massive cascade chain or a full grid clear. The meter resets if a spin ends without filling it, and the feature cannot retrigger once active.

Free Spins Built Around Risk Choice

Clearing the entire grid triggers Free Spins. You pick one of three options: Love gives 4 spins with 4 extra per meter refill, Star gives 5 with 3 extra, and Storm gives 8 with 2 extra. The total is capped at 20 spins regardless of which princess you choose.

Two things change during Free Spins that matter enormously. First, the chosen princess's Girl Power fires automatically on every non-winning spin, not randomly. Second, the multiplier carries over between spins instead of resetting. If you build a 7x multiplier on spin two, it stays at 7x for spin three. This carryover is where the big wins live. Clearing the grid during Free Spins pays an instant 100x bet bonus on top of everything else. The Princess Trinity meter can still fill to award extra spins, but Trinity itself does not activate.

The Paytable and Wild Creation

Eight regular symbols split into two tiers. The three princesses (Love, Star, Storm) all pay 10x bet for a 5-symbol match, while any mixed combination of princesses pays 5x. The low-pay tier consists of a winged bell, a pink heart, a blue star icon, and a green circle charm, paying between 2x and 3x for five. The Wild (a glowing moon) is the highest-paying symbol at 50x for five of a kind and substitutes for everything.

Wilds never land naturally on the grid. They only appear when a 3-symbol winning combination is cleared, leaving a Wild at the center of that removed cluster. This means every small win has potential to spawn a Wild that feeds the next cascade. If Wilds are the only symbols left on the grid, they disappear and count as a full clear.

RTP Tiers and What to Watch For

The default RTP sits at 96.50%, which is competitive for a 2017 release. But Play'n GO offers operators five configurable tiers: 96.50%, 94.51%, 91.49%, 87.50%, and 84.50%. The game looks identical at every setting. Players have no visual way to tell which version they are playing unless their casino discloses it, and many do not. Worth checking before committing any serious bankroll.

Volatility is high across the board. Long dry stretches are normal, and even triggered Free Spins can pay under 20x. The 5,000x max win requires a perfect storm of cascades, multiplier growth, and Wild placement. The math model has been reused almost exactly in Rise of Olympus, which swaps the princesses for Greek gods but keeps the same grid engine, making it a natural alternative for players who prefer a different theme.

Seven Sequels and Counting

Moon Princess spawned the longest-running franchise in Play'n GO's catalog. Moon Princess Christmas Kingdom (2021) added a holiday skin with a 15,000x cap. Moon Princess 100 (2022) pushed the multiplier to 100x and max spins to 100. Moon Princess Trinity (2023), Power of Love (2024), Origins (2025), and Stargazing (2025) each introduced new mechanics while keeping the core grid-clearing loop intact. Origins holds the series record at 20,000x max win. For a game approaching its eighth birthday, the original still holds up. Its feature set is leaner than any sequel, but the interaction between cascading clears, Wild creation, and Girl Power rescue spins creates a loop that later entries added complexity to without necessarily improving.