Guide · FORBIDDEN 15

FBD 15 hidden song, the summit on camera

FBD — FORBIDDEN — is the tier In Falsus locks above ULTIMATE, and this is the deepest public record of anyone diving into it: a level 15 hidden song whose name the uploader deliberately masks. Ironfork's chart view, uploaded two days after the 1.0 update, captures the whole attempt — and the attempt dies. This page walks all twelve frames: the masked song card, the wide floor notes only FBD charts carry, the full-width rows, and a result card that adds up to 2,208 notes with a longest chain of 12.

SongWithheld — the uploader masks title and artist (??? — ???)
DifficultyFORBIDDEN (FBD) 15 · 2,208 notes
Filmed run (Ironfork)DIVE FAILED · 031'883'504 · MAX LINK 12
Filmed conditionsNote Speed 4.0 · 3:03 video

Sources

Screenshots are frames from Ironfork's full FBD 15 run credited above — unmodified apart from cropping, each step deep-linked to its moment. FBD mechanics wording follows the Miraheze community wiki. The song's identity is intentionally masked in the source; this page keeps it that way.

Before the dive

  1. 1

    Read the card: FORBIDDEN 15, no record

    The dive's first screen shows everything the game is willing to say: a red 15 badge over the word FORBIDDEN, an empty HIGH SCORE row — nobody had a record on this card when it was filmed — and a jacket credited to the illustrator Suzunashi. No title, no artist. The song is one of the 1.0 update's hidden additions, and the uploader keeps it that way on purpose. Community wikis currently top out at FBD 13; this card reads 15.

    In Falsus song screen for the FBD 15 hidden song: red FORBIDDEN 15 badge, masked jacket, empty HIGH SCORE row
    Level 15 · FORBIDDEN · HIGH SCORE —: a first attempt, nothing hidden except the name.Watch the source clip
  2. 2

    Load the REFLECT deck

    Before any note falls, the run passes the REFLECT screen: five Connect cards chosen for this dive, lined up beside the guide character, with the previous panel listing the run's boost values — 3,500 and 2,300. FBD attempts are expensive declarations: everything you bring into a level 15 chart matters, because the chart will not forgive idle hands.

    REFLECT deck screen before the dive — five Connect cards beside the guide character in In Falsus
    Five cards, one dive: the loadout is set before the field appears.Watch the source clip

The opening minute: beams first, slabs right behind

  1. 3

    The first notes arrive as beams

    The chart opens under a million points and already looks like a boss: twin violet beams pour down the field while a cyan wide slab crosses the middle lanes. FBD charts keep all six keys live with every lane working, and this opening wastes none of it — the first seconds mix lane-wide beams with slab shapes that ULT charts save for their finales.

    Twin violet beams and a cyan slab open the FBD 15 chart at 000'607'830 in In Falsus
    Under 001'000'000 on the clock and the field already runs full width.Watch the source clip
  2. 4

    Wide beams land on top of taps

    Score 001'284'142: the opening burst floods the lanes with violet and cyan while BREAK and EXACT judgments alternate along the line. Wide floor notes are FBD-exclusive — they span several lanes, and any one of the overlapped keys hits them. The trap is overreaction: take a wide beam as one gesture, not six presses.

    In Falsus FBD 15 opening burst: violet and cyan beams flood six lanes as BREAK and EXACT alternate at 001'284'142
    Score 001'284'142: wide beams and single taps, one gesture apart.Watch the source clip
  3. 5

    Slabs trade places

    Past the minute mark the chart swaps its palette — a gold wide slab detonates across the left lanes, a green burst fires, and cyan panels slide down the middle. The field never rests: FBD 15 keeps re-seeding the ground so no hand position survives long. This frame's judgments already mix EXACT with BREAK — in this run, the chart started collecting casualties from here.

    Gold wide slab and green burst across the left lanes, cyan panels mid-field at 010'642'695 in In Falsus
    Score 010'642'695: gold and cyan slabs trade places mid-chart.Watch the source clip

Midchart: the wide-note war

  1. 6

    A slab rides over a BREAK wall

    Score 014'356'468: a magenta wide slab covers the right lanes under a row of BREAK judgments while cyan hold panels wait mid-field. FBD's wide holds can even transfer from one key to another mid-hold — a question no lower tier ever asks. Read the slab and the holds as separate work orders: catch the slab with any overlapped key, then settle into the hold.

    In Falsus FBD 15 magenta slab over a wall of BREAK judgments while hold panels wait at 014'356'468
    Score 014'356'468: one wide slab, riding a wall of BREAKs.Watch the source clip
  2. 7

    The full-width row

    Score 017'326'776: five BREAK judgments lit across the entire playfield width — the chart asking all six keys for the same beat. This is the signature the community wiki describes as wide floor notes exclusive to FBD, and at level 15 they arrive in rows, not singles. The answer is coverage, not speed: park fingers across the cluster and press through the row.

    Floor note row spans all six lanes of In Falsus, five BREAK lamps lit at 017'326'776
    Score 017'326'776: judgment lamps lit across every lane at once.Watch the source clip
  3. 8

    The floor note lands with a gold blast

    Score 017'999'573: a wide floor note detonates in a gold flash over the left lanes while a violet wave sweeps the rest of the field. Wide shapes in FBD are not garnish — they carry the chart's density, and at level 15 they stack with everything else the field is doing. The EXACT sandwiched between BREAKs in this frame is what reading overload looks like on the HUD.

    Wide floor note detonates in gold over the left lanes as a violet wave sweeps the In Falsus field at 017'999'573
    Score 017'999'573: the wide floor note lands, gold flashing.Watch the source clip
  4. 9

    The whole line judged in one gesture

    Score 026'975'404: EXACT and BREAK judgments span the entire six-lane line as a green burst fires on the right. Through the back half the chart stages full-width events every few seconds, and the score's steeper climb here shows the run salvaging what it could — taking the wide shapes while the narrow taps slipped past as BREAKs.

    EXACT and BREAK lamps span the whole judgment line in In Falsus as a green burst fires at 026'975'404
    Score 026'975'404: the whole line, judged in a single breath.Watch the source clip

The final stretch, the death, and the result card

  1. 10

    Twin slabs tighten the final stretch

    Score 031'982'119: twin green wide slabs squeeze the center lanes under a lone EXACT while cyan panels rise from the bottom of the field. In the last thirty seconds, slab-over-panel shapes arrive faster than this hand could answer — and beneath these frames, the Miss gauge was quietly draining.

    In Falsus FBD 15 late chart: twin green slabs squeeze the center under one EXACT at 031'982'119
    Score 031'982'119: twin slabs cinch the last gate.Watch the source clip
  2. 11

    The gauge empties in the final stretch

    The field goes blank and the score freezes at 035'522'308 — the Miss gauge has hit bottom, deep in the chart's final stretch. In Falsus does not fake mercy: once the gauge empties, the dive is over no matter how much chart remains. The frozen counter says this run made it most of the way through a three-minute song before the ladder's top rung said stop.

    Miss gauge emptied — the In Falsus playfield freezes at 035'522'308 with the CONTINUE prompt showing
    Gauge empty — the score frozen at 035'522'308.Watch the source clip
  3. 12

    Read the DIVE FAILED card

    The result card does the accounting: 1,072 + 26 EXACT and 12 NEAR against 1,098 BREAK — the judgments add up to 2,208 notes, the heaviest workload documented on any In Falsus chart. MAX LINK 12 tells you how it went: the chain never lived longer than a breath. Even a failed dive pays out — the encounter closed at 027'384'349, CERTIFIED. That is what the summit currently yields: a full-card autopsy.

    In Falsus DIVE RESULT for FBD 15: DIVE FAILED at 031'883'504 with 1,098 BREAK against 1,098 EXACT, MAX LINK 12
    1,072 + 26 EXACT · 12 NEAR · 1,098 BREAK — MAX LINK 12.Watch the source clip

What FBD charts do differently

FBD — FORBIDDEN — sits above ULT and rebuilds the playfield: all six keys are live on every chart, and wide floor notes appear only at this difficulty. Wide taps span several middle lanes and register from any overlapped key; wide holds can transfer between keys mid-hold. On this page's frames the signature shows up as judgment labels stretching across the full playfield width — the rows at 1:36 and 2:00 are textbook examples.

How does the ladder below compare? The launch roster's FBD ceiling was 11 (à la mode), with Ghost Ray at 10 — the first FBD charts players clear on the way up; a Steam community post documents a Ghost Ray FBD-10 clear. Community wikis now list level 13 charts (Latent Duality, Enigma, Mémoire). The level 15 card on this page sits above all of them — and the widest-reached capture so far, 8,000-plus views in its first two days, ends in DIVE FAILED. That is the current state of the summit: seen, measured, not yet cleared.

Mechanics wording follows the In Falsus Wiki (Miraheze), Rhythm gameplay page; the Ghost Ray FBD-10 clear is documented in Steam community discussion. Difficulty reference points: this site's song unlocks guide and community song-list data as of 2026-09-13.

FAQ

What is FBD in In Falsus?

FBD stands for FORBIDDEN — the locked tier above ULTIMATE. Its charts use all six keys plus wide floor notes exclusive to the difficulty, and the tier only appears once your mastery across the roster opens it. The launch charts topped out around FBD 10-11; this page covers a level 15 — the highest In Falsus chart we have seen filmed.

Which song is the FBD 15 hidden song?

Honestly: unknown — deliberately. The uploader masks both title and artist (the video is titled "??? - ???"), no community wiki had documented the name as of September 13, 2026, and the comment section does not name it either. What the footage does show: a three-minute chart of 2,208 notes, jacket art credited to Suzunashi, filmed at Note Speed 4.0. We keep the hidden-song framing so the reveal stays yours to find.

How do you unlock FORBIDDEN (FBD) charts?

By building mastery across many songs, not grinding one. The in-game notice reads "The knowledge of FORBIDDEN difficulty eludes you" — clear charts across the roster and FBD appears above ULT on each song. Our song unlocks guide maps the whole gate system step by step.

How hard is an FBD 15 chart?

Above everything currently documented. Reference points: Ghost Ray FBD 10, à la mode FBD 11, community wikis topping out at 13 — and this 15 sits above them all. The filmed run is the evidence: a strong player's chain never exceeded 12, nearly half the chart's judgments read BREAK, and the gauge emptied in the final stretch. Comments on the video put it past Arcaea's Testify BYD. Treat FBD 15 as the game's current wall.

Has anyone cleared FBD 15 — and how should you prepare?

No public clear had surfaced when this page was written — the widest-reached capture ends in DIVE FAILED at 031'883'504. The prep path is the FBD ladder itself: clear the level 10-11 charts (Ghost Ray, à la mode) until full-width floor notes feel normal, then climb into the newer 13s. Our score calculator shows how much each NEAR and BREAK on your own cards is still worth.

Written for infalsustips.com from our own demo testing and community research. Fact-checked against: In Falsus Wiki (Miraheze) (CC BY-SA 4.0) · In Falsus Wiki (Fandom) (CC BY-SA)

Data reflects demo v0.3.1 · being re-verified on 1.0 · Unofficial fan site — In Falsus © lowiro