Mouse P.I. For Hire: All Shrewd Shrews Door Codes and What They Unlock

The Depths in Mouse P.I. For Hire does not hold your hand. You ride a massive elevator down into a crumbling underground city, and almost immediately, a locked door with a lever panel blocks your path. The game gives you zero immediate context. If you want to know what is behind that door, you have to find the codes yourself or brute-force your way through every possible combination.

This guide covers every known working code, where to find each one organically in the level, and exactly what you unlock when you punch it in.

Where to Find the Locked Door

Before you start hunting for codes, you need to locate the door itself. After the elevator drops you onto the ground floor of The Depths, take an immediate hard left. Walk past the frightened local mouse and the wall covered in “SPIKE-D IS MICE” graffiti. Keep hugging the left side until a small wooden staircase comes into view. Climb it, step inside the room at the top, and you will find the control panel with four lever columns ready for input.

To reset the puzzle and test multiple codes in one visit, simply enter the code, step through the door to see the room, then exit and re-enter the code room. The panel resets every time.

All 8 Working Door Codes

Note for completionists: None of these codes connect to collectibles, achievements, or side jobs. Players going for 100% completion can skip the door entirely without missing anything.

Where to Find Each Code In-Level

The developers hid four codes organically inside The Depths. You do not need a guide to find them, but knowing where to look saves significant backtracking.

Code 2137

You find this one almost immediately. Step back out of the code room and look underneath the wooden platform you just climbed. Crouch into the dirt beneath the support beams and look for tally marks scratched into the wood. They read 2-1-3-7. Enter this code and Jack fires off a line of Polish dialogue. The room rewards you with a table and 10 coins.

Code 0451

Head back to the ground floor and circle around to the opposite side of the shrew community. Find the storefront labeled “Quick Loans Edek Pitos & Co.” Walk inside, hop over the banker, and check the paper at the back of the shop. It clearly displays 0451. This is a nod to a classic immersive sim that veteran players will recognize instantly. Jack calls it a classic when you enter it. Ten coins wait inside next to a vault door.

Code 1234

This one requires some level progression. Push forward through The Depths until you reach the second floor, marked by “Writers untie!” graffiti beside a flower and an anchor. Look up and spot the grapple point hanging from balloons. Swing up to the ledge above and look for a wooden platform with fish graffiti sprayed on the wall over it. Instead of going through the nearby door, crouch under the platform and crawl into the warp pipe. It spits you out into a tiny secret room with tally marks reading 1-2-3-4. Jack jokes that it matches his luggage combination. The room holds some spilled drinks and 10 coins.

Code 3125

You come across this code late in the mission while chasing the magnet that carries your valve objective. When the magnet finally drops the valve onto a desk labeled “lost n’ found,” stop before you pick it up. Check the shelving unit to your right. The bottom shelf holds a piece of paper reading 3-1-2-5. This room delivers the most unsettling reward in the set: a bizarre hovering creature with glowing glasses, a puritan hat, flowing black hair, and rubber hose arms floating silently above candles and an open suitcase. Jack says nothing. Take the 10 coins and leave.

The Easter Egg Codes

Four additional codes exist outside the main level flow. These come from community discovery and developer hints, not in-world clues.

Code 1920

Entering 1920 opens a slightly older, retro version of Jack Pepper’s office. Nothing looks dramatically different at first glance, but the subtle design changes make it a genuine easter egg for players paying close attention to the game’s visual history. No coins here, just atmosphere.

Code 2019

This one is a direct message from the development team. The room contains a desk, a blackboard, and a handwritten note reading “Fumi Team xoxo.” It reads like either a placeholder waiting for a team photo update or a tongue-in-cheek nod to games that do include hidden developer rooms. Either way, you walk out 10 coins richer.

Code 0316

The door swings open to reveal a massive framed portrait of a bald, bearded, shirtless man with glasses standing behind a rock. Grab your 10 coins. Fans of a certain legendary professional wrestler will immediately recognize who this tribute honors.

Code 1224

This code is the most unsettling in the set. The door opens with a thick hiss of smoke. Once the smoke clears, you are staring at a bloodstained surgical bed, scissors on the floor, an open medical briefcase, and a pair of Groucho Marx glasses resting on a block of cheese. Jack audibly calls it creepy. He is not wrong. Collect the 10 coins and move on.

Players who grind through multiple codes in rapid succession may notice something strange. After entering several codes back to back, a solid black mouse statue quietly appears inside the code room. It does not move or attack, but it watches you from the moment it shows up. The game offers no explanation for it. Play Now!

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