The short answer is harsh: current guide coverage treats MOUSE: P.I. For Hire as a one-run game with no mission replay, no chapter select, and no New Game+. If you want clean completion, rely on manual saves instead of assuming you can come back later.
The point players need to know first
The practical point of no return is the mission Jack Squat. Current trophy routing says that once you accept it, you lose the normal cleanup loop around the P.I. Office and its attached side content.
That means the safest approach is simple:
- Keep a permanent save before Jack Squat.
- Finish side jobs before starting it.
- Buy any shop-cleanup collectibles before starting it.
Can you replay missions?
Current guide coverage says no. There is no mission list that lets you revisit cleared chapters, and there is no post-game route that sends you back through older stages for cleanup.
That matters because a lot of advice online assumes collectible cleanup can happen later. For this game, the safer assumption is the opposite.
What is most likely to be missable?
Side jobs
Side jobs are the first thing to protect. If a job is tied to a specific story window, do it before you push the next major mission.
Side-job reward baseball cards
Some card rewards depend on actually finishing the job that grants them. Those cannot be treated like normal shop cleanup.
Schematics and secret figurines
Current collectible routing treats these as field pickups, not fallback shop items. If you miss one in a locked story segment, the clean fix is usually an earlier save.
Final-mission collectibles
The safest reading is that late-game cleanup gets tighter, not looser. Do not walk into the last stretch assuming newspapers, comics, or cards can always be recovered afterward.
What is usually safer to miss and buy later?
Current collectible guides consistently describe these sets as the more forgiving ones:
- Newspapers
- Baseball cards found in normal mission routing
- Comics
The catch is timing. Even forgiving collectibles only stay forgiving while you still have access to the normal shop loop.
Save strategy that actually works
Keep a rolling mission-start save
Make one manual save before each main mission. That gives you a clean fallback if you realize you missed a collectible set, side-job trigger, or achievement window.
Keep a permanent Jack Squat save
Do not overwrite it. This is the anchor save for every late-game cleanup mistake.
Keep a side-job protection save
If you are chasing completion, keep at least one extra save around the side-job stretch before the endgame, especially if you are also protecting achievement attempts.
FAQ
Is there New Game+?
Current guide coverage says no.
Can you go back to earlier mission areas?
Current guide coverage says no reliable replay or chapter-select path exists, so the safe answer is no.
What should I finish before Jack Squat?
Side jobs, shop cleanup, and anything tied to a specific hub-state window.