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In Falsus Collab Songs: All 7 Crossovers

Cryogenic appears in Arcaea, Cytus II, CHUNITHM, maimai DX, ONGEKI, UNBEATABLE and Lanota — versions, difficulties and unlock details for each, with sources.

Sep 12, 2026infalsus.orginfalsus.org

One song is quietly staging the largest takeover in rhythm-game history. Cryogenic — Camellia's track with NIJISANJI EN's Petra Gurin, written for lowiro's In Falsus — spent the summer of 2026 hopping from one rhythm game to another, until by launch week it was playable in seven other titles at once. Nobody else covers this In Falsus collab wave in one place, so this page does: every verified crossover, with the version it arrived in, how you unlock it, what the chart is called in that game, and a gameplay screenshot from an actual player.

Everything below was checked on September 12, 2026. Official announcements are labeled as such; everything else is community evidence from named players, linked under each screenshot. The list is still growing — Rotaeno is next — so expect updates.

The In Falsus collab at a glance

| Game | Added in | How you get it | Chart there | First verified | | --- | --- | --- | --- | --- | | Arcaea (lowiro) | v6.13, March 2026 | Free, limited-time World Mode | Future 9 / Eternal 10 | Mar 9, 2026 | | CHUNITHM (SEGA) | summer 2026 event | Arcade song rotation | MASTER 14 | Jul 2, 2026 | | maimai DX | summer 2026 event | Game & Variety category | MASTER | Jul 17, 2026 | | ONGEKI (SEGA) | summer 2026 event | Arcade song rotation | MASTER 14 | Jul 23, 2026 | | UNBEATABLE (D-CELL) | patch 2.3, Aug 31, 2026 | Free (official) | 20☆ "unbeatable" | Aug 31, 2026 | | Cytus II (Rayark) | v5.2.18, Sep 8, 2026 | Free single (official) | CHAOS 14 | Sep 8, 2026 | | Lanota (FEIMUSTUDIO) | v4.2.0, Sep 9, 2026 | Event Shop, 5000 Stabilized Sound | Master 14+ | Sep 9, 2026 |

One song, seven games, three platform families — mobile, arcade and PC. Here is each crossover in order, with the evidence.

Arcaea — the home game gets it first (v6.13, March 2026)

The least surprising crossover: Arcaea belongs to lowiro too, so when In Falsus was still months from launch, its lead song already slipped into Arcaea's Memory Archive in v6.13 — with a Future 9 chart and an Eternal 10 on top. Community documentation records it as a free, limited-time World Mode entry rather than a paid single. The uploader who recorded the footage below sightread it to an EX+ on March 9, 2026 — four months before In Falsus even released.

Arcaea gameplay of Cryogenic by Camellia ft. Petra Gurin showing the Eternal 10 difficulty label and score counter on the sky-input journey screen

Gameplay: flipster — Cryogenic, Eternal 10, EX+ sightread (arcaea v6.13)

Arcaea Track Complete result screen for Cryogenic showing ETERNAL 10, MAX RECALL 470 and an EX+ grade with the song jacket

Gameplay: flipster — Track Complete screen of the same run

Since this is an in-house move rather than a licensing deal, it may not stay the last one — but as of September 12, 2026, Cryogenic is still the only In Falsus song in Arcaea.

CHUNITHM — MASTER 14 on the SEGA cabinets

Petra Gurin herself confirmed on X that Cryogenic reached Japanese arcade cabinets, CHUNITHM included. The chart landed at MASTER 14, credited to note designer Falsely Lemon — verified here from a direct-capture chart-confirmation upload on July 2, 2026.

CHUNITHM MASTER 14 chart capture of Cryogenic showing the track info panel with Camellia ft. Petra Gurin (In Falsus) during the opening lanes

Gameplay: チュウニズム譜面保管所 Mate — Cryogenic [MASTER 14] chart confirmation

maimai DX — the In Falsus jacket in the Game & Variety category

maimai DX picked the song up the same summer, filed under the ゲーム＆バラエティ (Game & Variety) category with a MASTER chart; chart data is also catalogued on dxrating.net. The direct-feed capture below is from July 17, 2026 — and its publisher explicitly allows reuse of their external-output recordings, which is why you can see the In Falsus jacket rendered right on the cabinet screen.

maimai DX MASTER gameplay capture of Cryogenic with the In Falsus jacket art inside the ring and a cyan slide toward the star note

Gameplay: S.R.project — Cryogenic MASTER AP (maimaiでらっくす外部出力)

ONGEKI — MASTER 14 in the third SEGA cabinet

Cryogenic's arcade tour didn't stop at two SEGA games. ONGEKI lists it at MASTER 14 as well — this capture is from July 23, 2026, and a second player's external-output upload labels the game version as オンゲキ Re:Fresh Act.2. We have not located a standalone SEGA announcement page, so this entry rests on gameplay captures; the screenshots leave little doubt.

ONGEKI MASTER 14 gameplay capture of Cryogenic with red, green and blue bell lanes under the LEVEL 14 MASTER track panel

Gameplay: オンゲキ譜面保管所 — Cryogenic [MASTER 14] chart confirmation

UNBEATABLE — patch 2.3 makes it free (and no, Moon Child is not In Falsus)

On August 31, 2026, D-CELL shipped UNBEATABLE patch 2.3 with the official headline "THE STORY IS TRUE! PATCH 2.3 w/ MOON CHILD and In Falsus' 'Cryogenic' is LIVE!" — adding Cryogenic as a free playable track at level 20☆. Two things get conflated in community posts about this patch, so to be precise: the patch's other addition, Moon Child, is the theme of Moon Child — an unreleased 1990s Amiga game by Team Hoi — not an In Falsus song. The In Falsus collab part of patch 2.3 is exactly one track: Cryogenic.

UNBEATABLE final result screen for Cryogenic listing artist camellia ft. petra gurin, level 20 unbeatable, full combo and the In Falsus jacket

Gameplay: mauveberry — UNBEATABLE, Cryogenic (In Falsus collab), full combo S+

Cytus II — a free single for Rayark's 15th Anniversary (v5.2.18)

Rayark joined the party on September 8, 2026 with Cytus II v5.2.18. Their official update video description is unambiguous: alongside six other free anniversary songs, In Falsus's Cryogenic / Camellia ft. Petra Gurin joined as a "Free single added from In Falsus" — playable on the CHAOS 14 chart. It remains the only In Falsus song in Cytus II; the six other anniversary additions are Rayark-scene originals, not In Falsus tracks. Announcements went out via the official Cytus II Facebook page and X account.

Cytus II v5.2.18 official update trailer segment showing Cryogenic by Camellia ft. Petra Gurin with the In Falsus jacket and a Free Songs Added banner

Gameplay: 雷亞遊戲 Rayark Inc. — official Cytus II v5.2.18 update trailer

For a player-recorded full run of the chart itself, Micha's sightread Master Mode max-score clear is the cleanest reference.

Lanota — launch-day gift at 5000 Stabilized Sound (v4.2.0)

FEIMUSTUDIO's Lanota synced its v4.2.0 update to September 9, 2026 — literally the day In Falsus launched on Steam — and put Cryogenic in a time-limited Event Shop for 5000 Stabilized Sound, with a Master 14+ chart. Multiple players cleared it to Perfect Purified on day one.

Lanota Master 14+ gameplay of Cryogenic showing Harmony perfect judgments around the turning ring with the In Falsus jacket card behind

Gameplay: FreaklezTSK — Lanota × In Falsus, Cryogenic, PERFECT PURIFIED

Coming next: Rotaeno, and more rumors firming up

This is the part that will date fastest. Rotaeno's official account has announced that In Falsus content arrives in v2.27 on September 17, 2026, with Cryogenic joining the Base Song list. Community trackers additionally report Paradigm: Reboot (September 19) and Muse Dash (September 25) — neither verified against an official announcement by us yet, so treat those as reports. Bookmark this page and the patch notes tracker; both update as crossovers go live.

What about the other direction?

Has In Falsus itself returned the favor by importing songs from other games? No — not as of September 12, 2026. The launch build shipped 70+ songs (40+ originals, chart levels 1–11) and our song catalog documents all verified tracks at game version 1.0.2c, none flagged as inbound crossovers. Several launch tracks come from rhythm-scene veterans — Lime, USAO, Kobaryo, Sakuzyo — but licensed catalog music is a different thing from a documented cross-game collab event. If lowiro ever adds one, the patch notes tracker will catch it first.

Playing Cryogenic in In Falsus itself

The song started as one of the six demo Encounters and carries the story arc's coldest set piece. In the full game its charts top out at Evolved 5 / Ultimate 9 — the friendliest Camellia endpoint in the tracklist, and a common first Ultimate clear. Our Cryogenic song page has the per-difficulty breakdown, and the difficulty system guide explains what MIN/EVO/ULT/FBD levels mean; if you're grinding unlocks elsewhere, the song unlock guide covers every condition.

Sources

Official announcements:

Community evidence and documentation (all accessed September 12, 2026):