You’re walking through the rain-soaked streets of Krat, your clockwork heart thumping against your metal ribs, and suddenly a phone starts ringing. It’s jarring. In a world full of puppets trying to skin you alive, a ringing payphone feels like a trap. Honestly, it kind of is. This is your introduction to Arlecchino, the self-proclaimed King of Riddles, and the gateway to finding every Lies of P Trinity Key.
Most players treat these keys like simple fetch-quest items. You get the key, you find the green door with the triangle, you grab the gear, and you leave. But if you're just doing that, you're missing the weirdest, most unsettling narrative thread Neowiz tucked into this game.
Solving the Riddles Without Losing Your Mind
The first time you hear that phone near the Entrance to Venigni Works, Arlecchino asks you a riddle. It’s not particularly hard—the answer is "Human"—but the implications are heavy. Getting that first Lies of P Trinity Key feels like a victory. You take it back to the workshop, find the door hidden near the pipes, and get some decent clothes. Cool.
But the game gets meaner later.
By the time you reach Malum District or the Grand Exhibition, the riddles aren't just about logic; they're about your humanity. In the Grand Exhibition, Arlecchino asks about a candle. It’s a classic trope, but the way he mocks your "puppet nature" while giving you the key is what sticks. You aren't just opening doors; you're participating in a serial killer's parlor game.
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The Locations That Actually Matter
Don't expect the game to hold your hand on where these doors are. The developers were clearly fans of the old-school "find a secret wall" design philosophy.
- Venigni Works: This is the training wheels door. It’s right after the control room. If you miss this, you're going to struggle with the concept later.
- St. Frangelico Cathedral: This one is a pain. You have to drop down past the rolling electrified balls. One mistimed roll and you're back at the Stargazer. The door is tucked away in a dank corner that looks like every other dank corner in the basement.
- Estella Opera House: Most people run right past this because they're terrified of the spider-puppets hanging from the ceiling. It’s down in the dark bottom floor.
- Krat Central Station: You won't get this until late-game when the station is "corrupted." It’s hidden near the cliffside path.
The Twist in the Final Trinity Sanctum
This is where things get genuinely spoilery, so look away if you haven't finished the game.
The final Lies of P Trinity Key isn't even a key at first. It’s a "King of Riddles’ Hint." You have to solve a puzzle involving two statues in the Grand Exhibition. You rotate them to face each other, mimicking a secret handshake or a lovers' gaze, and a secret compartment opens.
But here’s the kicker: the last door isn't in a factory or a church. It’s in the heart of Arche Abbey.
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When you finally open that last door, you don't find a treasure chest. You find Arlecchino himself. He’s a broken, decaying puppet sitting in a chair, surrounded by the corpses of his "friends." He’s the one who killed Venigni’s parents. Suddenly, those fancy outfits you’ve been collecting feel a lot heavier. He asks you one final question: "Are you a puppet or a human?"
Your answer here matters for your ending. If you lie and say you’re a human (even if you feel like a machine), you gain humanity. If you’re brutally honest, you might miss out on the "Rise of P" ending. It’s a brilliant bit of design—tying a collectible hunt directly into the moral fabric of the protagonist.
Why the Rewards Are Better Than They Look
You might think, "I'm not doing all this for a waistcoat." You're wrong. The rewards behind the Lies of P Trinity Key doors include some of the best defensive gear in the game.
- The Blue Dragon Sword: Okay, it's not a sword, but the Workshop Union Strengthening Frame you find early on is a literal lifesaver against the bosses in the mid-game.
- Quartz: You need these for your P-Organ upgrades. Several Sanctums hide Quartz, which is the rarest currency in the game. If you want more pulse cells or a faster dodge, you need those keys.
- Amulets: Some of the specialized amulets, like the ones that increase physical damage reduction, are locked behind these doors.
The gear is great, but the lore is the real pull. Reading the notes left behind in these rooms reveals the downfall of the Alchemists and the madness of the puppet frenzy. It’s environmental storytelling that actually rewards you for paying attention.
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Practical Steps for Your Playthrough
If you're currently staring at a ringing phone and wondering what to do, keep these points in mind.
First, always carry a "Bright Red Apple." You can buy it from Polendina at the hotel after giving him a specific Krat Supply Box. You’ll need it for a riddle later in the Opera House. If you don't have it, you might get locked out of a key until New Game Plus.
Second, pay attention to the "Humanity" mechanics. Every time you solve a riddle or interact with Arlecchino, your "springs are reacting." This is a visual and auditory cue that you're becoming more human. If you're going for the "Real Boy" or "Rise of P" endings, these interactions are mandatory.
Third, don't ignore the statues in the Grand Exhibition. It's the only Trinity-related puzzle that isn't just a verbal riddle. You have to physically move the environment. It catches a lot of people off guard because the rest of the game is so combat-focused.
Finally, when you meet Arlecchino at the end, talk to him until his dialogue loops. There’s a specific item called the "Alchemist's Cape" that only drops if you exhaust his story. It’s one of the coolest looking items in the game, and it proves you saw the King of Riddles' story to its grim conclusion.
Next Steps for Success
- Check your inventory for the "King of Riddles' Hint" if you've reached the Grand Exhibition; if it's not there, go back to the statues near the gallery.
- Visit Polendina at Hotel Krat and ensure you've purchased the Apple before entering the Estella Opera House to avoid a permanent lockout on that cycle.
- Listen for the clicking sound in your chest after answering a riddle; if you don't hear it, you might be choosing "robotic" answers that prevent you from reaching the best ending.