Play this game ↗ · About this game · By alphaBETA DEV · Published 2026-10-23 · Editorial standards · Changelog

Buried Summer Walkthrough: All Three Endings

Spoiler warning: this article prints the tree-hole password, the six tree-hole entries, the six readable letters and all three endings. If you have not played yet, read only "How the password is derived" and "If you are stuck".

Every number here — the 9 diary entries, 15 guestbook messages, 5 album pages, 6 tree-hole entries, 6 readable letters, 10 clues and 3 endings — can be found on the corresponding screen in the game, and the unlock and ending triggers were checked against the actual wording shown in the game. The four screenshots were taken from the live build on 20 October 2026.

What counts as finishing

Buried Summer has no search box, no timer and no fail state. There are four steps:

1. Piece the tree-hole password together from the Class Diary, the Duty Roster and the Guestbook;
2. Open the Tree Hole and expand and read all six entries;
3. The Tin Box screen appears; you can open letters inside it;
4. Make the final choice on the Tin Box screen and enter one of three endings.

In particular:

• Only reading all six tree-hole entries opens the box. Entering the password and not expanding the entries does not count;
• The hidden Reply ending requires opening letter number 30 in the Tin Box first. If you don't, the third choice stays greyed out;
• The 10 clues are a collection count, not a gate. You can choose an ending at 4/10;
• A choice goes straight to an ending and cannot be undone.

How the password 062423 is derived

The password is not a birthday, and it is not a class number. It is written in three places, and you need all three:

1. Diary, 24 June 2009, "Buried Under the Third Brick": the author is number 23, Chen Jiayi. That is the burial day; she and number 05, Zheng Yi, are the duty students that week.
2. Duty Roster: for the week of 6/22 – 6/28, the duty students are "23 Chen Jiayi" and "05 Zheng Yi".
3. Guestbook, 24 June 2009, 19:12, Chen Jiayi (No. 23): "I set the tree hole password: the month and day, plus my student number, six digits. Don't write it on paper. Keep it in your head."

So:

• The month and day: 06 + 24 = 0624
• Her student number: 23
• Together: 062423

It is not 20090624, not 062405 (05 is Zheng Yi, not the person who set the password), and not Xiaoman's 07. The input tolerates spaces, hyphens and full-width digits, but there is only one correct six-digit answer. After two wrong attempts the page shows a hint.

The shortest route

The 9 diary entries: the timeline

On the Class Diary screen, opening an entry counts as reading it. The nine entries are in date order:

Only two entries really matter for the puzzle: 24 June gives the two numbers, and 30 June explains that the box is safe and the site is about to close. The other seven are the timeline: why someone comes back every 24 June, and why 2026 is different.

15 messages, 5 album pages, the duty roster

Guestbook: six messages worth reading

The Guestbook has 15 messages, from 2009 to 2026, with the newest at the bottom. The ones that matter are:

Most of the rest give the same "these seventeen years" clue: it is not one person coming back, but duty students from different years leaving one line each year. The last anonymous message, from 24 June 2025, reads: "My kid asked me why I have to look at a very old web page every year on this day. I said, because Mom's name from when she was little is on it."

Album: two of the five pages have clues

The Album has five photographs; open one for the full image, with the caption below:

Duty roster: the other half of the password

The Duty Roster runs five weeks, two people per week. For 6/22 – 6/28 it is "23 Chen Jiayi, 05 Zheng Yi". The line at the top — "Duty students: lock the door, wipe the blackboard, remember the tree hole password" — is not decoration. It explains who owns the password: the duty student of that week set it, so use her number 23, not Zheng Yi's 05 and not Xiaoman's 07.

The six tree-hole entries: read all six to open the box

The Tree Hole screen was built in 2009; only someone who knows the password can enter. It now holds six entries, dated from 2015 to 2026, each showing a date, a title and a signature. The six entries are:

Read all six (open every entry) before the Tin Box screen appears. Opening the door without reading is not enough; missing one is not enough either. Below the entries it always reads "The box appears only after all six entries are read."

The tin box and the six readable letters

The Tin Box screen is framed as "thirty letters, in student-number order", but the game lets you open six:

Letter 30 is the key to the hidden ending. On the Tin Box screen, open the envelope numbered "30" and read it, and the third choice — "Take only letter number 30, leave one line in the guestbook, and go" — becomes clickable. Without reading letter 30, only the first two endings are available.

The three endings

On the Tin Box screen, the three choices are the game's own words:

The three closing lines are:

• Reunion: "Some promises aren't made to be kept. They're made so the people who walked away know that someone once waited."
• Bury It Back: "Some things get buried not because they don't matter, but because you don't want to lose them a second time."
• Reply: "You didn't call everyone back, but you brought the 2009 version of yourself home."

The choice cannot be undone. To see all three, start separate runs, or reload from a point before the choice; there is no built-in rewind.

All 10 clues

Clues are not a gate, but 10/10 requires specific pages:

The easiest to miss are "Where the Box Went" and "The Appointment": they exist only inside the tree hole, so the password must be solved first. The other eight can be collected outside.

If you are stuck

Password wrong? The answer is 062423. The rule is "that day's month and day + the student number of the duty student who set it": 06 + 24 + 23. Don't add the year, don't use 05 (Zheng Yi), and don't use 07 (Xiaoman).

Tree hole open but no box? Entering the password is not enough. Expand and read all six entries. The page shows "n / 6 read"; only at 6 / 6 does the Tin Box screen appear.

Hidden ending greyed out? On the Tin Box screen, open the envelope numbered "30" and read it. After that, "Take only letter number 30" unlocks.

Why only six of thirty letters? The fiction is thirty; the game exposes six readable letters, and number 30 is yours. Do not look for the other twenty-four; they are not interactive.

What time is the meeting? Tree Hole, "See You Tomorrow" (2026-06-24) says "July 1, four in the afternoon." You arrive at 3:40, which is why the Tin Box screen opens "1 July, 3:40 p.m." Four is the appointment for the class, not your arrival time.

Does refreshing lose progress? Progress is stored on this device and resumes after a refresh; clearing browser data or changing devices starts over.

Related guides

• Buried Summer game page: mechanics, facts and real screenshots
• ERRATA complete walkthrough
• Midnight Watch walkthrough
• Unclaimed complete walkthrough

Changelog

• 2026-10-23: First published. Every count (the 9 diary entries, 15 messages, 5 album pages, 6 tree-hole entries, 6 readable letters, 10 clues and 3 endings) and every quoted line was checked against the wording shown on the in-game screens; the password 062423 was cross-checked in the 24 June 2009 diary, the 6/22 – 6/28 duty roster and the 24 June 2009 19:12 guestbook message. The four screenshots were taken from the live build on 20 October 2026.