The Posthumous Investigation
Complete Walkthrough

The complete loop-by-loop walkthrough for The Posthumous Investigation. The 100% completion run covers 38 loops, unlocks all achievements, and shows all endings. This guide is divided into three phases matching the investigation's natural progression arc.

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How to use this walkthrough: If this is your first playthrough, we strongly recommend using the Beginner's Guide first and only consulting this walkthrough when genuinely stuck. The investigation is far more rewarding when solved through your own deduction. Use Phase 1 for orientation, Phase 2 only after 5+ loops of your own, and Phase 3 for 100% achievement completion.

๐Ÿ“‹ Walkthrough Phases

๐Ÿ—บ๏ธ
Phase 1 ยท Loops 1โ€“10

Reconnaissance & First Evidence

Map all 14 suspects' schedules, collect the first round of Evidence nodes, establish your baseline Thinking Board, and encounter your first major contradiction.

๐ŸŸข New Player Friendly โฑ ~3.5 hours
Read Phase โ†’
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Phase 2 ยท Loops 11โ€“25

Deep Investigation & Chain Building

Resolve all major testimony contradictions, access the hard-to-reach evening and dawn evidence windows, complete all three accusation chains, and reach both standard and true endings.

๐ŸŸก Intermediate โฑ ~5 hours
Read Phase โ†’
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Phase 3 ยท Loops 26โ€“38

100% Completion & All Achievements

Dedicated loops for all remaining achievements including conversation milestones, deliberate wrong-accusation achievements, hidden dialogue branches, and ending-specific unlocks.

๐Ÿ”ด Achievement Hunter โฑ ~3 hours
Read Phase โ†’

๐Ÿ”„ All 38 Loops โ€” Quick Reference

Jump directly to any loop. Each loop entry links to the relevant phase page with anchor.

Loop YouTube Timestamp Primary Objective Phase
Loop 1 โ–ถ 0:00 Full location & NPC schedule mapping Phase 1
Loop 2 โ–ถ 32:12 Initial dialogue pass โ€” all 14 suspects Phase 1
Loop 3 โ–ถ 48:42 First contradiction identification Phase 1
Loop 4 โ–ถ 1:19:42 Evidence collection โ€” accessible day locations Phase 1
Loop 5 โ–ถ 1:38:54 Study document (10:00+ window) + first board build Phase 1
Loop 6 โ–ถ 1:48:12 Cafรฉ meeting window (12:15โ€“12:45) Phase 1
Loop 7 โ–ถ 2:12:01 Second suspect tier conversations Phase 1
Loop 8 โ–ถ 2:37:41 Port District evening window (18:00+) Phase 1
Loop 9 โ–ถ 3:00:58 Bedroom second visit + dawn garden (07:00) Phase 1
Loop 10 โ–ถ 3:19:54 Motive chain completion attempt Phase 1
Loop 11 โ–ถ 3:45:44 Cross-character testimony cross-reference Phase 2
Loop 12 โ–ถ 4:08:10 Alibi contradiction evidence Phase 2
Loop 13 โ–ถ 4:27:36 Means chain physical evidence completion Phase 2
Loop 14 โ–ถ 4:44:11 Hidden dialogue branch โ€” time-window exclusives Phase 2
Loop 15 โ–ถ 5:00:59 Board connection review + test accusation Phase 2
Loop 16 โ–ถ 5:18:25 Standard Ending attempt Phase 2
Loop 17 โ–ถ 5:34:30 True Ending evidence gaps identified Phase 2
Loop 18 โ–ถ 5:58:31 Secondary conspirator evidence collection Phase 2
Loop 19 โ–ถ 6:32:52 True Ending board completion Phase 2
Loop 20 โ–ถ 6:50:58 True Ending achieved Phase 2
Loop 21 โ–ถ 7:10:03 Hidden location sequence Phase 2
Loop 22 โ–ถ 7:21:14 Cross-character manipulation โ€” private meeting Phase 2
Loop 23 โ–ถ 7:36:12 Extended secondary evidence pass Phase 2
Loop 24 โ–ถ 8:03:55 Dialogue achievement โ€” character full tree Phase 2
Loop 25 โ–ถ 8:25:07 Dialogue achievement โ€” second character Phase 2
Loop 26 โ–ถ 8:55:08 Wrong accusation achievement (circumstantial) Phase 3
Loop 27 โ–ถ 9:11:09 False conviction achievement (full wrong chain) Phase 3
Loop 28 โ–ถ 9:17:47 Early-loop timed achievement Phase 3
Loop 29 โ–ถ 9:23:38 Timed achievement โ€” loop 2 window Phase 3
Loop 30 โ–ถ 9:33:36 NPC schedule manipulation achievement Phase 3
Loop 31 โ–ถ 9:45:28 Hidden literary Easter egg dialogue Phase 3
Loop 32 โ–ถ 9:55:34 Combat / confrontation achievement (Black Eye) Phase 3
Loop 33 โ–ถ 10:04:57 Benevolent achievement (Marie Grant full dialogue) Phase 3
Loop 34 โ–ถ 10:13:28 Dawn-only exclusive achievement Phase 3
Loop 35 โ–ถ 10:22:23 Evening-only exclusive achievement Phase 3
Loop 36 โ–ถ 10:32:39 Final hidden location completion Phase 3
Loop 37 โ–ถ 10:40:04 Remaining minor achievements cleanup Phase 3
Loop 38 โ–ถ 10:47:58 Final loop โ€” 100% board + All Achievements Phase 3

๐ŸŽฌ Full 100% Walkthrough Video (No Commentary)

The complete 100% run by NeatPick โ€” all 38 loops, all achievements, all endings. Use the loop timestamps above to jump to the exact loop you need.

Beginner's Guide โ†’Time Loop System โ†’Thinking Board Guide โ†’All Endings โ†’All 14 Characters โ†’All 28 Achievements โ†’All Locations โ†’General FAQ โ†’