How many missions are in Mouse P.I. For Hire?

The campaign runs through 24 main story missions, from Big Mouse, Little Hope at the opening to the final version of Big Mouse, Little Hope at the end.

How many side jobs are in Mouse P.I. For Hire?

The current completion route tracks 14 side jobs. Several are easy to miss because they unlock between missions or during a mission rather than from normal hub cleanup.

Can you go back for missed side jobs later?

You should not assume that. The safest route is to clear available side jobs before advancing the next main mission and to keep multiple manual saves if you are going for 100 percent.

Mouse P.I. For Hire Mission List and Side Jobs Guide

If you want the fastest progress check in MOUSE: P.I. For Hire, the campaign runs through 24 main missions and the completion route currently tracks 14 side jobs. The safest habit is to treat every return to the P.I. Office or Roadhouse as a cleanup stop before you launch the next story mission.

How long the campaign is

For a straight story run, most players land around a short-to-mid single-digit session count rather than a huge RPG-length campaign. A cleaner way to think about it is:

Main path: around 7 to 9 hours.
Completionist route: around 14 to 16 hours once collectibles, clues, and side jobs are included.

If your goal is 100%, pair this page with the dedicated all side jobs guide and all collectibles guide.

Full mission list

Big Mouse, Little Hope (Prologue)
The Vanishing Act
Gumshoe in the Opera
Bandel’s Laboratory
A Bit of a Scene
Cheeseball Sub
Once Upon a Time… By Tinsel Bros.
White Lies and Dark Secrets
A Bit of Curd and Pepper
Saltwater Cambozo
Damp Evidence
Shrewd Shrews
It All Points Here, Right?
To Catch a Mockingmouse
The Bookkeeper By Tinsel Bros.
Fatal Repulsion By Tinsel Bros.
Swamp Oddity
One Flew
?lednaB evetS si lleH eht erehW
Glugging From the Deep
Jack Squat
The House of the Empty Mouse
Fair Enough
Big Mouse, Little Hope (Final)

First mission gameplay screenshot

Chapter walkthroughs

Missions where side jobs matter most

Opera mission overview screenshot

The risky part is not the mission count. It is the missions that hide optional work before you realize you are locking yourself forward.

Early side-job checkpoints

Gumshoe in the Opera: Show Some Culture, Jack
Cheeseball Sub: Blueprints, Please
Once Upon a Time… By Tinsel Bros.: The Things We Keep
A Bit of Curd and Pepper: They Call It “Azurro Burgerro”
Saltwater Cambozo: Fishy Business and Imported Goods

Mid-game missable pressure

Damp Evidence: Perfect Bog Fondue
It All Points Here, Right?: Oh Yes… They Float
To Catch a Mockingmouse: Between Alpha and Omega and Mouseburg Confidential
The Bookkeeper By Tinsel Bros.: Poster Girl
One Flew: Behind the Nuts

Late-game cleanup

Glugging From the Deep: Slugs in the Shell and Friends in Deep Places

For the full reward list and unlock notes, use the dedicated all side jobs guide.

Published side job guides

The easiest side jobs to miss

The two Mockingmouse jobs

Between Alpha and Omega and Mouseburg Confidential are risky because they show up during the mission instead of in the normal hub rhythm. If you are playing for completion, treat them as stop-everything objectives.

Perfect Bog Fondue

This is one of the most common cleanup searches because it turns into an item hunt inside Damp Evidence. Use the separate Perfect Bog Fondue Thingies guide if you want the fast route.

Behind the Nuts

If you are protecting a completionist save, make a manual save before committing around this stretch.

Best mission-by-mission checklist

Use this every time the story moves:

Return to the hub and talk to every NPC until dialogue repeats.
Buy any recoverable collectibles before forgetting them.
Check if a side job can be finished before the next mission.
Keep a manual save if you are entering a known missable-heavy section.