Last Updated on 21 April, 2026
Stepping into the monochrome, rubber-hose animated streets of MOUSE: P.I. For Hire drops you straight into a gritty noir mystery where one wrong move can cost you your badge. This comprehensive survival dossier solves the mystery of the game’s unforgiving progression system and decodes every hidden vault combination. By detailing the exact requirements for a perfect, single-playthrough achievement run, this guide ensures you never miss a vital collectible or weapon blueprint. Grab your trench coat and your trusty firearm as we crack this case wide open.
Did You Know? The hardboiled, gumshoe protagonist Jack Pepper is voiced by Troy Baker, one of the most prolific voice actors in the modern video game industry.
Table of Contents
- 1. Unlocking the Underground Vault
- Acquiring the Necessary Quest
- Traversing the Subterranean Labyrinth
- The Definitive Combination Registry
- 2. The Master Detective’s Blueprint for Trophies
- Disregarding the Challenge Modifiers
- The Finality of Your Decisions
- Maximizing Your Archival Capacity
- 3. Amassing the Ultimate Curio Collection
- Strict Budgeting Protocols
- Assembling the Baseball Roster
- Securing Daily Press and Comic Books
- 4. Acquiring Advanced Armament Schematics
- Hunting in the Shadows
- Executing Flawless Vault Extractions
- 5. Conclusion
1. Unlocking the Underground Vault
A highly coveted room awaits you in the shadows, requiring a specific four-digit sequence to grant access. The developers scattered these numerical combinations across the entire environment. Punching in a correct sequence transforms the room, displaying unique sights and dispensing valuable loot based on the numbers you chose. If you neglected to memorize the sequences during your travels, we have the complete registry ready for you.
Acquiring the Necessary Quest
You will discover this hidden area strictly within the level known as The Depths. However, the game restricts your access entirely until you actively hold the mission titled Shrewd Shrews. Once you secure this objective, you can begin your descent.
Traversing the Subterranean Labyrinth
Upon entering the stage, advance normally until you encounter a massive elevator. Ride this platform all the way down. The moment you step off the elevator, pivot to your left. Continue walking in this direction until a specific piece of graffiti catches your eye. You are looking for the exact phrase “SPIKE-D IS MICE” painted on a building.
Proceed up the staircase situated right next to this artwork and walk through the door. You will now find yourself standing inside the combination room.
The Definitive Combination Registry
Approach the mechanism and enter any of the following sequences to claim your rewards:
- 1 2 3 4
- 0 4 5 1
- 2 1 3 7
- 3 1 2 5
- 1 9 2 0
- 0 3 1 6
- 2 0 1 9
- 1 2 2 4
Pro Tip: Keep this specific list of numbers open on a separate screen or write them down on a physical notepad to save yourself the hassle of backtracking through the game to memorize them.
2. The Master Detective’s Blueprint for Trophies
Earning every single accolade requires a strict understanding of the underlying mechanics. MOUSE: P.I. For Hire operates with an unforgiving structure. You must meticulously plan your actions to avoid permanently missing out on crucial milestones.
Disregarding the Challenge Modifiers
You have the freedom to select whichever combat intensity you prefer. The system does not lock any alternate endings or special trophies behind a higher skill requirement. Your experience will yield the exact same completion rewards whether you select the Rookie setting or the Super Sleuth setting.
The Finality of Your Decisions
The structure demands that you achieve a perfect run. The developers did not include a New Game+ feature, nor did they implement a way to replay previous stages. The story completely ends once you finish the final objective, revoking all access to the Overworld Map and the P.I. Office. Furthermore, your accumulated clues and artifacts do not transfer over to new save files. You have to conquer everything in one singular playthrough.
Maximizing Your Archival Capacity
The engine restricts you to a maximum capacity of 50 save slots. You need to utilize these slots aggressively. The moment you exit a stage, you cross a point of no return. Any side jobs you leave unfinished become permanently failed. The interface offers zero warnings about this lockout mechanic.
Pro Tip: Always double-check your active quest log to verify you have completed every available side job before you take the exit path out of a mission area.
3. Amassing the Ultimate Curio Collection
Full completion requires you to hunt down three specific categories of nostalgic items: Baseball Cards, Newspapers, and Comics. As stated previously, you must secure every single one of these items on the exact same file.
Strict Budgeting Protocols
Coins dictate your ability to finish your collection. You must conserve your currency exclusively for purchasing artifacts. If you desire the trophy tied to the baseball card minigame, you must utilize a clever workaround. Create a manual save file, spend your funds on the minigame to pop the trophy, and then immediately reload your file to reclaim your lost wealth.
Assembling the Baseball Roster
You will stumble across standard player cards while exploring hostile territory. If you accidentally walk past one, the Ammo Store located at the P.I. Office will thankfully sell it to you after you conclude that specific mission. These recovered items always carry a flat price tag of 100 coins.
However, the Ammo Store also hoards exclusive merchandise. The vendor sells premium cards that do not exist anywhere else in the environment. These rare items will drain your wallet, costing anywhere between 500 and 1000 coins a piece.
Securing Daily Press and Comic Books
Newspapers and Comics follow a nearly identical acquisition process. You loot them during your operations or buy the ones you missed from the Ammo Store later. Newspapers offer one additional avenue of purchase. A Paperboy loiters right next to the P.I. Office. This character acts as a secondary vendor who functions exactly like the Ammo Store for providing missed newspaper issues.
Pro Tip: Visit the Ammo Store and the Paperboy immediately after returning from every single assignment to ensure you never fall behind on purchasing the exclusive items and the ones you missed.
4. Acquiring Advanced Armament Schematics
Weapons require their own unique blueprints before you can utilize them. These schematics demand a much higher level of observation and care compared to the standard paper goods scattered around the city.
Hunting in the Shadows
You cannot buy these diagrams from vendors. You can only extract them from the mission environments themselves. The developers hid these upgrades carefully inside designated Secret Areas or locked them away inside heavy iron safes. You must scour every corner of the map to locate them.
Executing Flawless Vault Extractions
You must handle the cracking process with extreme caution. If you input the wrong sequence or slip up during the minigame, the safe will permanently jam. The game completely denies any second attempts. Your only method of recovering from a jammed lock involves reloading a previous file and losing your recent progress.
Pro Tip: Manually record your progress into a brand-new save slot the exact moment you lay eyes on a safe so you can instantly retry if you trigger the jamming mechanism.
5. Conclusion
Navigating this cartoonish yet brutal underworld demands more than just a quick trigger finger and a sharp eye. With the secret codes unlocked and a flawless strategy for hoarding coins and managing saves, you now possess the blueprint to solve every problem this corrupted city throws your way. This guide has fully equipped you with the foresight to bypass jammed safes and prevent permanently failed side jobs. Keep your fedora tipped low and trust your instincts as you secure your legacy as the ultimate animated private investigator.
Fun Fact: Players were pleasantly surprised to find that the game features a large, built-in collectible card minigame that you can spend hours playing. The developers took this so seriously that the physical Mouseburg Edition of the game includes 33 real world Mouseburg Baseball Trading Cards inspired by the in-game activity.
