Yunyun Syndrome All Soft Locks & How to Avoid Them

Table of Contents

1. Preparation: What a Soft Lock Actually Means
2. The Seven Soft Locks: Complete Catalog
3. Save Management: The ERROR. RESTART GAME. Folklore
4. Diary Order Lock: The Silent Killer
5. Stat Threshold Locks: Why 999% Is a One-Way Door
6. The Final Choice Lock: Accept vs. Reject
7. Important Notes
8. The Safe Playthrough Template
9. Final Take

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Preparation: What a Soft Lock Actually Means

A soft lock in Yunyun Syndrome is not a crash. The game keeps running. You can keep playing. But a specific ending or achievement is now permanently unreachable on that save file. There is no warning prompt. No “are you sure?” dialog. The game simply records an internal flag and moves on, and you will not discover the lock until you reach the point where the ending should trigger — and it does not.

This is by design. Yunyun Syndrome is a game about information control and digital consequences. Your choices persist. Your mistakes persist. The only escape hatch is loading an earlier save or starting fresh.

I learned this the hard way. Six save files burned before I mapped every soft lock condition. This guide is the catalog I wish I had on playthrough one.

My worst soft lock came on save file #4. I had DENPA at 85%, a conspiracy trend near the top of the board, and most of the diary pages read. Then I pushed DOKIDOKI to its 999% ending on a whim to test the TOO CUWUTE! row. The bad ending triggered, the achievement unlocked, and the true ending path collapsed. That save could never reach DONIDEMONARE. I had to start over from slot 5.

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The Seven Soft Locks: Complete Catalog

Community walkthroughs list seven soft lock conditions. Three of them I can tie to a named ending or achievement row with a consistent story; the other four attach to real rows whose shipped descriptions are blank, so they are folklore until the developer or a patch note says otherwise. Ranked by how easily players trigger them:

#	Soft Lock	Trigger	What It Blocks	Evidence
1	Stat Threshold	DOKIDOKI/HYPE/YUNYUN hits 999%	True ending on current save	Strong - three named 999% endings exist as rows (9.1% / 8.9% / 8.6%)
2	Diary Order	Diaries read out of sequence	DONIDEMONARE on current save	Strong - route consensus; the password chain is corroborated by a named achievement at 8.8%
3	Final Choice	Accepting yunyun’s offer	DONIDEMONARE on current save	Strong - route consensus; DONIDEMONARE is a real row at 24.5%
4	Save Slot Exhaustion	Fill every slot	Future saves; “ERROR. RESTART GAME.”	Weak - the row exists at 12.0% with a blank description; the slot count is unsourced [Unverified]
5	Premature Conspiracy	High conspiracy influence before DENPA 100%	Certain IF endings	Weak - ordering advice, not a documented gate [Unverified]
6	Daily Time Limit	Playing past the in-game day	”Sleepy time now!” (7.8%)	Weak - rarest row in the set, blank description [Unverified]
7	Signal Rejection	DENPA TRANSMISSION at the wrong state	A true-ending variant	Weak - I found nothing that names this condition [Unverified]

Quick Prevention Reference

Soft Lock	Prevention
Stat Threshold	Do not farm DOKIDOKI/HYPE/YUNYUN to a 999% ending before the true ending
Diary Order	Read one diary at a time, fresh save before each
Final Choice	Save in two slots before the Patootie fight finishes; reject to get DONIDEMONARE
Save Slot Hygiene	Name every save at creation, overwrite deliberately, never hoard
Conspiracy Ordering	Bank DENPA progress before pushing a trend to the top of the board

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Save Management: The ERROR. RESTART GAME. Folklore

Here is the honest version of a claim this page used to make with confidence. I could not verify the number of save slots in Yunyun Syndrome. An earlier draft of this guide stated the game has exactly 60 slots and that filling all of them triggers the “ERROR. RESTART GAME.” ending. I have now checked the store description, every patch note from 1.0.6 through 1.3.0, and the shipped achievement list: the achievement row exists, it sits at 12.0% ownership, and its description is blank. Nothing in any of those sources names a slot count or ties this row to slot exhaustion. [Unverified - trigger mechanism for ERROR. RESTART GAME.]

That does not make the row unimportant. A 12% achievement is deep in the tail - behind the true ending at 24.5% and behind the three 999% stat endings - so whatever triggers it is genuinely rare, and the name reads like a deliberate meta-joke about save management. What I am no longer willing to do is print a number and an anecdote I cannot source.

What I Actually Do With Saves

This is workflow, not game rules. It is the part that transfers regardless of how many slots the game hands you:

Slot 1: PT1 - Foundation (prologue + exploration, nothing irreversible)
Slot 2: PT2 - True Ending route (the save you protect at all costs)
Slot 3: PT3 - Conspiracy sweep
Slot 4: PT4 - Stat threshold farming (disposable on purpose)
Slot 5: PT5 - Hidden/joke tail
Slot 6: ROLLBACK - last known-good state, never overwritten mid-route

1. Name every save the moment you create it. A slot called “PT2” tells you future-you not to touch it.
2. Create a fresh save instead of overwriting before irreversible beats - diary reads, the final choice, any push toward 999%.
3. Treat one slot as a rollback anchor. When a route dies you reload instead of restarting from nothing.
4. Do not confuse “I have plenty of slots” with “I have clean reload points.” The lock that costs players the most is not running out of space; it is having space but no save from before the mistake.

What I can still stand behind from my own playtime: the diary-order lock and the 999% stat lock both bit me on real saves, and in both cases the game said nothing. The ending screen just played, the achievement list updated, and the route I wanted was gone. That silence is the whole reason this guide exists.

The endings guide has a more detailed breakdown of the multi-playthrough route and which saves to assign to each phase.

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Diary Order Lock: The Silent Killer

This is the soft lock with the strongest community consensus behind it and the weakest in-game documentation. You find Qtie’s diary scattered across her desktop, read it in whatever order you stumble onto, and the route guides claim the sequence matters for DONIDEMONARE. Nobody can show you the check happening - the evidence is indirect, and it is good evidence. The achievement row Childhood Memz ships with the description “You found all the pages of Qtie’s diary!” at 16.6% ownership, which tells you the diary is a collectible page set, not a numbered file list.

What I Can And Cannot Print

Claim	Status
Diary content is gated behind an archive you have to open	Real - the Y-unzip! row exists at 57.5%
The archive password is “rim de lacent”, Yunyun’s character song title	Best-supported: a dedicated row, Rim de Lacent. at 8.8%, carries that exact string
Finding all diary pages is its own achievement	Real - Childhood Memz, 16.6%
Passwords “Kurumi Kurusu” and “0606”, plus the Diary 1 / 2 / 7 numbering	Community-reported. Nothing in the achievement list, store page, or patch notes names them [Unverified]
Reading them out of order corrupts the true ending flag	Route consensus, no citable in-game text [Unverified - mechanism]

What Happens If The Order Claim Is Right

Then the failure is silent, and that is the part every version of this guide agrees on. There is no error message, no “diary sequence corrupted” warning, no counter showing 3 of 6 pages read. You keep playing, you keep transmitting, you keep fighting Patootie, and at the end the ending you wanted simply does not arrive. The only signal is an achievement list that stays one row short.

Prevention

• Save immediately before reading each diary page, so a wrong-order suspicion has a reload point
• Read one page per session rather than binge-clearing the desktop - if the sequence matters, small steps keep the rollback cheap
• If you are unsure whether you read them correctly, load the save from before the first page instead of pushing on and hoping

On the password itself: “rim de lacent” is the piece I will stake the guide on, because the game mints an achievement with that string as its name and puts it in the rare tail at 8.8%. The other two passwords this page used to print as fact - a character name and a four-digit number you reveal by dragging Yunyun around - are things I have only ever seen repeated between walkthroughs. I checked the 49-row achievement list for corroboration and found none. Use them if the game asks for them; do not assume they are the only answers. The true ending guide covers the diary chain and its evidence in full.

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Stat Threshold Locks: Why 999% Is a One-Way Door

DOKIDOKI, HYPE, and YUNYUN all cap at 999%. Reaching that threshold triggers a bad ending and permanently blocks the true ending on that save. There is no way to decrease a stat below its current value except through Miss penalties, and Miss penalties are too small to reverse a 999% threshold.

The Three Stat Locks

Stat	999% Ending	Achievement	Blocks True Ending?
DOKIDOKI	TOO CUWUTE! (9.1%)	Yes	Yes, permanently
HYPE	It’s pure chaos. (8.6%)	Yes	Yes, permanently
YUNYUN	Everything will be yunified. (8.9%)	Yes	Yes, permanently

Why Players Trigger This Accidentally

The most common scenario: a player is exploring, hitting notes cleanly, and does not notice DOKIDOKI climbing between charts until it is on the threshold. I cannot give you the per-note rate, because the game does not publish one - the “+5% per Perfect on NORMAL, so two Full Combos = 999%” arithmetic that used to sit in this paragraph came from an earlier draft of this site and no patch note, store page, or developer post backs it. [Unverified - per-note stat gain values are not published.]

That is precisely why the lock catches people. Without a documented gain rate you cannot predict when a stat crosses 999%, so the only safe practice is to read the meter before every chart rather than assume you have runway left. The measurement method in the stat farming guide works here in reverse: clear one chart, record the delta, and you know how much margin the next clear consumes.

The second most common scenario: a player reads about the TOO CUWUTE achievement online, decides to farm DOKIDOKI on their main save, and does not realize it blocks the true ending until it is too late.

Prevention

• Track your DOKIDOKI/HYPE/YUNYUN values in the stat panel
• Keep a habit of reading the three meters before every chart on a true-ending save. The hard trigger everyone can point to is 999%; the mid-hundreds “disqualifies you” threshold that older walkthroughs quote is not something I can source, so treat it as folklore rather than a documented gate. [Unverified - no published sub-999 stat ceiling for the true ending.]
• The DOKIDOKI 999% route should only be executed on a dedicated cleanup save
• Save before every chart clear during farming runs so you can reload if you overshoot

The stat threshold locks are the reason the multi-playthrough route exists. The game is designed so that true ending completion and stat farming cannot coexist on the same save. Accept this. Plan your playthroughs accordingly.

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The Final Choice Lock: Accept vs. Reject

After defeating Patootie, yunyun offers to delete herself from the drive. This is the final narrative fork.

The Lock Condition

• Reject = DONIDEMONARE triggers (true ending)
• Accept = alternate ending triggers (not the true ending)

If you accept, the DONIDEMONARE achievement does not unlock, and the true ending is blocked on that save. The game does not let you go back and change the choice — you would need to reload a save from before the Patootie fight.

Prevention

• Save in two separate slots before the Patootie fight begins
• Reject yunyun’s offer for the true ending
• If you want the accept ending too, load the second save and accept

This lock is the easiest to avoid because it is a single binary choice at the end of a clear sequence. The only way to mess it up is not knowing which option leads to the true ending. Now you know: reject.

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Important Notes

Soft locks are permanent per save file. There is no reset button, no New Game+ carry-over that bypasses them, no secret menu to clear flags. The only recovery is loading an earlier save or starting a new playthrough.

Multiple soft locks can stack. If you read diaries out of order AND push DOKIDOKI to 999%, you have two independent locks on the same save. Neither can be undone.

The Engage Link ending requires the true ending save. After DONIDEMONARE, you must complete all remaining conspiracies on the same save to unlock Engage Link. If your true ending save is soft locked from other conditions, Engage Link may also be blocked.

“ERROR. RESTART GAME.” is a real achievement with no documented trigger. The row ships at 12.0% ownership with an empty description. The slot-exhaustion story attached to it is the most widely repeated soft lock claim in the community, and the least verifiable. Chase it if you want, but do it on a save you have already milked. [Unverified]

“Sleepy time now!” is the rarest row in the game at 7.8% and its description is blank. The daily-time-limit story is community inference. If you want it, keep a rollback save rather than assuming you can trigger it on your main file. [Unverified]

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The Safe Playthrough Template

Follow this template to avoid every soft lock while achieving 100% completion:

Playthrough 1: Foundation (Save Slot 1)

Step	Action	Soft Lock Risk
1	Complete the Q † CHANNEL prologue	None
2	Explore desktop, drink energy drink	None
3	Trigger 1-2 IF endings casually	Low
4	Do NOT read any diary pages yet	Avoid diary order lock
5	Do not chase the 999% meters this run	Avoid stat threshold lock (no documented safe ceiling below 999% - just stay away)
6	Save at major milestones	Keep clean reload points, not spare space

Playthrough 2: True Ending (Save Slot 2)

Step	Action	Soft Lock Risk
1	Build DENPA to 100%	Low (DENPA is safe to farm)
2	Read the diary pages one at a time, fresh save before each	Critical if the order claim holds - the cheap insurance is the save, not the sequence
3	Open the diary archive (password: “rim de lacent”)	None once the archive is open
4	Trigger DENPA TRANSMISSION	None at full DENPA
5	Push the conspiracy trend you need for the route	Ordering advice only; the specific percentage gates are unsourced [Unverified]
6	Defeat Patootie	None
7	Reject yunyun’s offer	Critical: reject, do not accept
8	Complete remaining conspiracies for Engage Link	None

Playthroughs 3-6: Cleanup (Save Slots 3-6)

Playthrough	Purpose	Soft Lock Risk
PT3	Conspiracy farming (IF endings)	Low
PT4	Action-required endings	Low
PT5	Stat threshold farming (999% each)	Intentional — these saves are disposable
PT6	Hidden/joke endings + cleanup	Low

Six saves is the whole template. Whether the game gives you 60 slots or 6, the binding constraint is not space - it is that you never overwrite the state before a branch you might want to reverse. I compress this to four playthroughs when I am in a hurry by letting PT4 and PT6 share a file; I never compress PT2 and PT5 together, because that is exactly the save-burn the stat lock is designed to punish.

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Final Take

Yunyun Syndrome is talked about as having seven soft locks. Three of them I will defend with evidence - the 999% stat endings, the diary chain, and the final accept/reject choice. The other four are stories attached to real achievement rows whose descriptions ship blank. None of them come with a warning prompt, which is the one claim in this genre that has never been wrong.

The prevention rules that survive the fact-check:

1. Never push DOKIDOKI/HYPE/YUNYUN to a 999% ending on a true ending save.
2. Save before every diary page, and read them one at a time.
3. Reject yunyun’s offer at the final choice.
4. Manage saves for reload points, not for space - the trigger behind ERROR. RESTART GAME. is not documented, so do not plan around it.
5. Bank DENPA progress before you top a conspiracy trend board.

Follow those five and the documented locks stay off your main save. The undocumented ones I cannot promise anything about - and neither can any walkthrough that quotes a slot count it never checked.

The game’s design philosophy is clear: consequences are permanent, information is hidden, and the only safety net is your own save management. It is frustrating. It is also the point. Yunyun Syndrome is a game about living with the consequences of digital actions. The soft locks are not bugs — they are the thesis statement.

For the full ending route map and multi-playthrough strategy, check the endings guide. For the DOKIDOKI farming route (on a dedicated cleanup save), see the DOKIDOKI 999% route. The achievement rows cited above are catalogued in the 49 achievement guide.

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Sources

Source	Date	Used For
Steam achievement list, app 2914150	retrieved 2026-10-09	All 49 row names, shipped descriptions, ownership rates (ERROR. RESTART GAME. 12.0%, Sleepy time now! 7.8%, Childhood Memz 16.6%, Y-unzip! 57.5%, Rim de Lacent. 8.8%, DONIDEMONARE 24.5%)
Steam store page, app 2914150	retrieved 2026-10-09	Tracklist and product framing; checked for a save-slot count and found none
Ver. 1.0.9 patch notes	2026-06-01	Difficulty rating unification referenced in the stat lock discussion
Ver. 1.0.7 patch notes	2026-04-27	DENPA tuning that makes older payout ladders unreliable

No source in this table states a save slot count, a 23:59:59 day limit, or a diary numbering scheme. Those claims are labelled where they appear rather than dropped silently, so you can see exactly which parts of the route are documented and which are community inheritance.