SONG GUIDE · FBD 15 · HIDDEN CHART
FBD 15 — The Hidden ▓ Chart
ARC 4: THE HAND OF CALAMITY · ∞ · WITH ANOMALY
The top of In Falsus' difficulty scale has no name: the song select lists this entry as ▓ blocks, credits the artist as ∞, and its top chart is the only FBD 15 in the catalog — the game's highest documented level. This page walks that chart through Seol's verified full attempt, frame by frame: song select, the FORBIDDEN 15 detail screen, the COMMAND pick, the dive and the DIVE FAILED result. No public clear had surfaced when this page was last checked (2026-09-18), so every claim stays inside what the frames and the song database show.
TL;DR
- ▸Identity: the entry with the masked title — shown as ▓ blocks in game, artist credited as ∞ — carries the catalog's only FBD 15 chart (v1.0.2c): MIN 6, EVO 9, ULT 12, FBD 15.
- ▸Chart build: wide crossing beams, fan streams and a golden hexagon ring wall, ending on a result screen that counts 3,108 judgements — the largest tally documented in the song database.
- ▸Clear status: no public DIVE CLEARED had surfaced as of 2026-09-18 — Seol's full attempt on this page ends DIVE FAILED at rank C, and Ironfork's written chart view records the same result.
- ▸Every still deep-links Seol's upload at the shown moment; the run closes at 084'992'566 with the MISS GAUGE at -14.
SOURCE FOOTAGE
Every frame on this page comes from Seol's FBD 15 attempt: a full-screen chart capture with no handcam, no facecam and no commentary. It records one continuous run — song select with the masked entry and the 6/9/12/15 rail, the FORBIDDEN 15 detail screen, the COMMAND partner pick, the dive, DIVE FAILED and the rank C result. The upload's title carries the phrase 'with Anomaly'; on screen that reads as red distortion rolling through the background, and this page describes it only as what the frames show.
A second record exists on the text side: Ironfork's chart view of the same song — a written breakdown, not footage — also ends at DIVE FAILED. It is credited as a source for cross-checking the chart's shape; no frame on this page comes from it.
Deep-link seconds can land a frame or two off the exact moment; every still on this page was verified individually against the video. Clear-status claims are time-boxed: last checked 2026-09-18.
THE SONG AT A GLANCE
CATALOG DATA · v1.0.2cThe catalog entry, straight from the site's song database (community-wiki data, v1.0.2c). The Song row is not corruption: in game the title is masked, displayed as ▓ blocks in place of a name — the community id tokonagi exists so databases can file the entry. Levels are documented for all four tiers; the footage on this page covers the FBD 15 chart itself.
| Song | ▓ |
|---|---|
| Artist | ∞ |
| Arc | Arc 4: The Hand of Calamity |
| Game version | 1.0.2c |
| Levels — MIN / EVO / ULT / FBD | MIN 6 · EVO 9 · ULT 12 · FBD 15 |
→ Song Unlocks→ In Falsus Song List — All 70 Tracks with Chart Levels
HOW THE ATTEMPT UNFOLDS
11 FRAMES · SEOL FBD 15 RUNEleven frames, one lesson each: how the masked entry presents at song select, what the FORBIDDEN 15 badge and the COMMAND pick confirm, where the beams go widest, what the hex ring wall asks, and what a DIVE FAILED result still teaches. Timestamps quote the source video at the shown moment.
- 1
Find the masked entry: 6 / 9 / 12 / 15
The song select screen lists the entry without a name — the title row renders as ▓ blocks above a dark red-and-grey jacket. The SELECT DIFFICULTY rail reads MIN 6, EVO 9, ULT 12, FBD 15, and the capture locks onto 15 before hitting PLAY.

FBD 15 ATTEMPT · 0:00 SONG SELECT · Footage: Seol ↗ - 2
The FORBIDDEN 15 badge
The detail screen confirms the scope: a red 15 DIFFICULTY FORBIDDEN badge — FBD stands for FORBIDDEN — sits over the masked song card with HIGH SCORE reading 000. The COMMAND progress row shows NIA → FELL; this guide describes what the screen shows, not how the entry is earned.

FBD 15 ATTEMPT · 0:04 SONG DETAIL · Footage: Seol ↗ - 3
COMMAND: NIA or FELL
Before the dive, a COMMAND step asks for a partner — NIA and FELL face each other across the pick screen. What the choice changes isn't visible in the footage, so the guide leaves it exactly there: one partner is picked and the dive starts.

FBD 15 ATTEMPT · 0:10 COMMAND PICK · Footage: Seol ↗ - 4
No quiet opening
The dive starts already hot: at score 000'746'268 four cyan streams fall side by side with a yellow wedge cutting in, and EXACT judgements land three at a time. There is no readable ramp — settle your hand position in the first seconds or the quad streams will decide for you.

FBD 15 ATTEMPT · 0:17 DIVE OPENING · Footage: Seol ↗ - 5
Four vertical beams, every lane live
Seconds later the same idea returns wider: four blue vertical streams span the lanes at score 002'542'977. Nothing about the pattern rewards bursts — it asks for even finger distribution and a steady scan from lane edge to lane edge.

FBD 15 ATTEMPT · 0:20 QUAD BEAMS · Footage: Seol ↗ - 6
The wide fan streams
Around score 015'132'210 the chart opens into blue-and-white fans spreading across the whole field, EXACT rows landing as they pass. The fans look enormous but travel narrow: track each fan's centre line and the edges resolve themselves.

FBD 15 ATTEMPT · 0:40 WIDE FANS · Footage: Seol ↗ - 7
Crossing beams and yellow bursts
The first real traffic jam: red and cyan wide beams cross the field at score 023'665'835 while yellow burst clusters fire from the gaps. Read the crossing point rather than either beam, and commit early to the lane that stays open longest. The red distortion behind the playfield runs heaviest through this stretch — screen dressing, not a pattern to play.

FBD 15 ATTEMPT · 1:00 CROSSING BEAMS · Footage: Seol ↗ - 8
Yellow arrows over pink streams
Past the midpoint the palette flips: yellow arrow shapes drop over dense pink streams at score 047'570'644. The arrows break the horizontal reading the fans trained, so re-anchor on each pink stream's landing lane before following the arrows back up.

FBD 15 ATTEMPT · 1:40 ARROWS + STREAMS · Footage: Seol ↗ - 9
The hex ring wall
The chart's centrepiece: a red wall of notes under a golden hexagon ring, dense streams running through both, and green NEAR effects flashing at the line — hits landing just outside the exact window. The capture shows no fuller frame; if the chart hides its hardest read, it is here.

FBD 15 ATTEMPT · 2:00 HEX RING · Footage: Seol ↗ - 10
DIVE FAILED at 084'992'566
The banner lands over an emptied playfield with the score at 084'992'566: DIVE FAILED, the MISS GAUGE drained to -14. This is where the source run stops — and where every public record of this chart had stopped when this page was last checked (2026-09-18).

FBD 15 ATTEMPT · 2:48 DIVE FAILED · Footage: Seol ↗ - 11
Read the result screen
The result freezes the whole story: 084'992'566, rank C, DIVE FAILED, EXACT 2,218 + 274 split across two rows, NEAR 299, BREAK 317, MAX LINK 165, timing split EARLY 237 / LATE 62. The judgement rows total 3,108 — the largest count documented in the song database — with RETRY and CONTINUE waiting underneath and the 15 badge beside the jacket.

FBD 15 ATTEMPT · 3:00 RESULT · Footage: Seol ↗
FBD 15 FAQ
SEARCH INTENT · ANSWEREDWhat is the FBD 15 song in In Falsus?
It is the entry at the top of the game's difficulty scale: the only FBD 15 chart in the catalog (v1.0.2c), with MIN 6, EVO 9 and ULT 12 beneath it. The title is masked in game — the song select renders it as ▓ blocks — and the artist is credited as ∞. Song databases file the entry under the community id tokonagi.
Has anyone cleared FBD 15 in In Falsus?
No public clear had surfaced when this page was last checked (2026-09-18). The attempt documented here — Seol's full run — ends DIVE FAILED at rank C with the MISS GAUGE at -14, and Ironfork's written chart view of the song records the same result. That is a statement about public records at a point in time, not a claim about the chart's ceiling.
How do you unlock the hidden song?
Only interface-visible facts are safe to state: the masked entry appears in the song select list with its 6/9/12/15 difficulty rail, and launching it runs a COMMAND partner step — choosing between NIA and FELL — before the dive. The capture shows no unlock condition being met, so this page won't invent one; the song unlocks guide tracks what has been verified.
How many notes does the FBD 15 chart have?
The song database has not recorded an FBD notes breakdown for this entry — the lower tiers' counts are documented, the top chart's isn't. What is public: the result screen on this page counts 3,108 judgements — EXACT 2,218 + 274, NEAR 299, BREAK 317 — the largest judgement total in the catalog's records.
What does FORBIDDEN difficulty mean?
FBD is the fourth tier on every In Falsus song — MIN, EVO, ULT, then FBD, spelled FORBIDDEN on the detail screens. On most tracks it is the ceiling chart. Here the badge reads 15 DIFFICULTY FORBIDDEN, the highest level documented anywhere in the game; the difficulty guide explains how the four tiers scale.