SPOILERS: Challenge! Dark DonChare Solutions


Point to Note
Numbering of anomalies are only based on the position in the list of unlockable titles. Unless otherwise specified, you do not need to neutralize the anomalies in order.

Official Links
Taiko no Tatsujin official blog (Japanese, English, trad. Chinese, Korean)

Chapter 1 (2026/04/16)
Event QR Code
Anomaly 1
ANOMALY
  1. All Don-chan voice acting in the game disappeared
  2. Disappeared tracks: tracks with "Don-chan" in the title or sang by Don-chan
  3. Anomalous track: How to Play (あそびかた説明)
    • At the top of Namco Original folder
    • Background music of the in-game tutorial without Don-chan speaking
SOLUTION
  1. (if not obtained from 3rd generation) Unlock Wada Don instrument from Challenge! DonChare 2026
  2. Clear How to Play with full Spirit Gauge in Dark DonChare with Wada Don as the instrument
REWARD
  1. Title: Anomaly of Don-chan Neutralized! (異変 どんちゃん解消！)
  2. Title: Fastest: Don-chan Neutralized! (最速 どんちゃん解消！) only to the first solver
Anomaly 2
ANOMALY
  1. Ura notecharts cannot be played (it will immediately flip back to regular Oni even after entering the usual command)
  2. Game Tips when playing any track with Ura notechart: 裏ノ存在証明ヲセヨ Prove the existence of the other side (Ura)
  3. The following notecharts have all notes reversed (don become kat and vice versa) by default
    • Senpuu no Mai [Earth] (all difficulties) Note: after being recovered from Anomaly 3
    • [Sou-uchi] Souryuu no Ran (Oni only)
    • [Sou-uchi] Shunyuu ~happy excursion~ (Oni only)
INFO
The above tracks are the only Ura notecharts playable at this state
  • Senpuu no Mai [Earth] was the Ura notechart to the Senpuu no Mai (Earth) in AC14
  • Souryuu no Ran and Shunyuu ~happy excursion~ has 2P Ura Oni notechart in the 2nd or 3rd generation
SOLUTION
 Play any one of the above notechart in Dark DonChare with Abekobe/Reverse modifier
REWARD
  1. Title: Anomaly of Ura Notecharts Neutralized! (異変 裏譜面解消！)
  2. Title: Fastest: Ura Notecharts Neutralized! (最速 裏譜面解消！) only to the first solver
Anomaly 3
ANOMALY
Disappeared tracks: tracks that were unlockable in 2nd generation (AC10~14)
INFO
Secret command hidden in white text in the event mode's official blog post, similar to unlock commands in 2nd generation (AC10~14)
（３）（　）（　）（　）
（　）（　）（９）（　）
（　）（２）（　）（　）
（　）（　）（　）（５）
（１）（　）（１）（　）
SOLUTION
  1. Enter the secret command before entering any mode. A feather icon appears on the bottom-right and Angel Dream is now recovered
  2. Play Angel Dream in Dark DonChare
REWARD
  1. Title: Anomaly of Secret Command Neutralized! (異変 隠しコマンド解消！)
  2. Title: Fastest: Secret Command Neutralized! (最速 隠しコマンド解消！) only to the first solver
Chapter-wide Reward
Title: Challenge! Dark DonChare (挑戦！闇のドンチャレ)

Chapter 2 (2026/04/17)
Event QR Code
Anomaly 4
ANOMALY
  1. Anomalous track: middle of the middle
    • Middle of the Namco Original folder Dokidoki Mune-kun Omatsuri Time
    • Sound effect of Ranking Dojo track transition
  2. Anomalous Ranking Dojo Gaiden trial: middle of the first
    • Same tracks as KATSU-DON Chuuken (Yuugao no Kimi Oni, Kanadea Oni, DON'T CUT regular Oni) but significantly easier goals
    • Grants the title Right3 D.C. Right3Left1 when cleared
INFO
  1. Chuuken is the third out of five (middle) trial of the KATSU-DON Ranking Dojo (first ever)
  2. Kanadea is the second out of three (middle) track of KATSU-DON Chuuken (middle)
  3. D.C. or Da capo is a musical term to signify repeat from the beginning
  4. In the KATSU-DON Ranking Dojo list starting from Kanadea, counting three tracks to the right lands at Tsukikage SASURAI
  5. Returning to the beginning i.e. Kanadea, counting three tracks right then one track left is Blue Rose Ruin
SOLUTION
  1. Clear middle of the first in Ranking Dojo Gaiden to obtain the title Right3 D.C. Right3Left1
  2. Play in order Tsukikage SASURAI and then Blue Rose Ruin in the same credit in Dark DonChare
REWARD
  1. Title: Right3 D.C. Right3Left1
  2. Title: Anomaly of Ranking Dojo Neutralized! (異変 段位道場解消！)
  3. Title: Fastest: Ranking Dojo Neutralized! (最速 段位道場解消！) only to the first solver
Anomaly 5
ANOMALY
  1. Anomalous folder: Donder! Nippon-ichi Ketteisen 2013 Setlist Tracks
    • Contents: Aisowarai, Eternal bond, Bakemono Tsukiyo
    • Folder subtitle: 優勝をかけた戦いに勝利しよう！ Win the battles that begets a Champion!
  2. Disappeared track: Yuugen no Ran
INFO
  1. Aisowarai, Eternal bond, Bakemono Tsukiyo were the Shop Preliminary setlist tracks for Donder! Nippon-ichi Ketteisen 2013
  2. "Future Lab" is the nickname for the headquarters of Bandai Namco. Future Lab the track is directly inspired by its previous iteration in Shinagawa
  3. Joubutsu 2000 was the Final Battle setlist tracks for Donder! Nippon-ichi Ketteisen 2013
  4. The overall champion of Donder! Nippon-ichi Ketteisen 2013 was given the chance to be the first to play the then-unreleased Yuugen no Ran as exhibition
SOLUTION
  1. (optional) Win when playing Aisowarai in AI Battle Performance to obtain the title Join the Finals
  2. (optional) Win when playing Eternal bond in AI Battle Performance to obtain the title Opening Year was 2014
  3. (optional) Win when playing Bakemono Tsukiyo in AI Battle Performance to obtain the title Opening Venue was Future Lab
  4. Play both Future Lab and IOSYS Aki no Nikushoku Matsuri 2014 in the same credit in Dark DonChare or AI Battle Performance to obtain the title Rightful Seat at the Final Battle
  5. Win when playing Joubutsu 2000 in AI Battle Performance to obtain the title Rightful Seat at the Exhibition; Yuugen no Ran is now recovered
  6. Clear Yuugen no Ran in Dark DonChare
REWARD
  1. Title: Join the Finals (決勝大会に参加せよ)
  2. Title: Opening Year was 2014 (開催年は2014年)
  3. Title: Opening Venue was Future Lab (開催場所は未来研究所)
  4. Title: Rightful Seat at the Final Battle (決勝戦進出権)
  5. Title: Rightful Seat at the Exhibition (エキシビジョン挑戦権)
  6. Title: Anomaly of Nippon-ichi Ketteisen '13 Neutralized! (異変 日本一決定戦'13解消！)
Anomaly 6
ANOMALY
  1. All yellow drumroll notes are invisible (but still playable)
  2. Anomalous track: Revival Drumroll (復活連打)
    • Next to Dokidoki Mune-kun Omatsuri Time
    • Background music of the Revival Drumroll sequence in 2nd generation including Don-chan voice
    • Has no regular notes so forced to fail
  3. Anomalous track: New Revival Drumroll (新・復活連打)
    • Replaces Revival Drumroll after Solution Step 2
    • Background music of the Revival Drumroll sequence in 3rd generation without Don-chan speaking
INFO
Revival Drumroll is a mechanic in the 2nd and 3rd generations in which, after failing the first song, you may win the chance to continue playing by hitting enough drumroll hits. This does not activate when failing at subsequent songs.
SOLUTION
  1. Play Revival Drumroll in Dark DonChare as the first song of the credit (and forced to fail)
  2. The 2nd-generation Revival Drumroll will activate at the results screen. Successfully clear it to gain access to New Revival Drumroll
  3. Clear New Revival Drumroll in Dark DonChare (requires Good on the only note)
REWARD
  1. Title: Anomaly of Drumroll Neutralized! (異変 連打解消！)
  2. Title: Fastest: Drumroll Neutralized! (最速 連打解消！) only to the first solver
Chapter-wide Reward
  1. Instrument: Machina (まきな)
  2. Mini Character: Machina (Detective Ver.) (まきな(探偵Ver.))

Chapter 3 (2026/04/18)
Event QR Code
Anomaly 7
ANOMALY
  1. Disappeared tracks: all of 2000 Series and related tracks except Saitama 2000
  2. Game Tips sometimes: エトウ「来年は睡眠学習トレーニングでどう？ 2000匹まで数えるとか。」
    Etou: "What do you think about sleep-learning training next year? Like counting up to 2000 (sheep) or something."
  3. Morse Code secret message in Soroban 2000 in past Chapters of Dark DonChare
    • Chapter 1: SOS 真実を取り戻すため真実の数を刻んでください SOS×14
      SOS In order to restore the truth, please engrave the number of truth SOS×14
    • Chapter 2: SOS 真実を取り戻すため本来の私に刻んでください SOS×14
      SOS In order to restore the truth, please engrave on the original me SOS×14
  4. Anomalous track: Linda wa Kyou mo Zetsufuchou (リンダは今日も絶不調, lit. Linda's Still Not Feeling Great Today)
    • Next to Saitama 2000
    • Actual music is Joubutsu 2000
    • On the surface, the notechart only has "SOS" in Morse Code repeated 47 times
    • Notechart force-diverges to Master Path at the start, force-diverges to Normal Path for half a bar at the end of drums part, then diverges back to Master Path
    • Diverges to Professional Path with exactly 28 drumroll hits before the diverge points. Morse Code secret message: 真実の数は演奏前に刻む SOS
      Engrave the number of truth before the performance SOS
INFO
  1. Created by Linda AI-CUE, the 2000 Series now has 28 entries in total with Haya Saitama 2000, Kita Saitama 200, Yokuderu 15300, Nesin Amatias and Saitama 2001 counted separately. (Shimedley 2000+, ≠MM and Akiba 20XX are NOT counted)
  2. The "Linda" in Linda wa Kyou mo Zekkouchou relates to Linda AI-CUE, with some vocal shouts also provided by him.
SOLUTION
Enter Linda wa Kyou mo Zekkouchou in Dark DonChare with 28 seconds left on the timer and play it
REWARD
  1. Title: Anomaly of 2000 Neutralized! (異変 2000解消！)
  2. Title: Fastest: 2000 Neutralized! (最速 2000解消！) only to the first solver
Anomaly 8
ANOMALY
  1. The "Etou Beam" stream in Hurtling Boys Oni was replaced by a yellow drumroll note
  2. Anomalous track: Hurtling Beams
    • Next to Hurtling Boys
    • Only the "Etou Beam" stream repeated 12 times
    • Go-go Time on the 3rd and 10th repeat
    • Ura notechart (unlocked in Solution Step 3) is the "Etou Beam" stream once but spread over the 12-time sound effect
  3. The "Neo Etou Beam" stream in Lightning Boys Ura Oni was replaced by a yellow drumroll note
  4. Anomalous track: Lightning Beams
    • Next to Lightning Boys
    • Only the "Etou Beam" stream repeated 12 times
    • Go-go Time on the 3rd and 8th repeat
    • Ura notechart (unlocked in Solution Step 3) is the "Neo Etou Beam" stream once but spread over the 12-time sound effect
  5. Game Tips sometimes: ルール：コピーの反映は一度に連続して順番に行わなければならない
    To reflect Rule: Copy, you must follow the sequence in order continuously and all at once.
  6. Game Tips sometimes: エトウ「来年は睡眠学習トレーニングでどう？2000匹まで数えるとか。」
    Etou: "What do you think about sleep-learning training next year? Like counting up to 2000 (sheep) or something."
INFO
  1. The Chinese Zodiac Series (干支シリーズ) are tracks released to Nijiiro ver. on January 1st since 2022, with references to the symbolizing animal in Chinese zodiac of the coming year. 干支 may be read either as kanshi or eto in Japanese. The following entries relates to this anomaly:
    • 2022: exTORA Trap!! with references to the Tiger (the 3rd Chinese zodiac)
    • 2025: Jatetsu with references to the Snake
    • 2026: UMA no Force Train2000g (3 variations) with references to the Horse
  2. Both Hurtling Boys (2013/10/16) and Lightning Boys (2025/08/16) were released within a Year of the Snake. The months of their release dates are encoded in the Go-go Time of their respective Beams notechart
  3. Next year (2027) will be the Year of the Goat (shares kanji with sheep)
  4. Counting sheep is commonly associated with helping someone to get into sleep
SOLUTION
  1. Play exTORA Trap!! in Dark DonChare to obtain the title Beam Copier Kit
  2. (optional) Play either Hurtling Beams or Lightning Beams regular Oni in Dark DonChare with the title Beam Copier Kit to obtain the title Error: Beam Overload
  3. Play Jatetsu in Dark DonChare to obtain the title Edis Rehto eht ot Emoc. Ura notecharts for Hurtling Beams and Lightning Beams are now playable
  4. With title Beam Copier Kit unlocked, Play Hurtling Beams Ura Oni in Dark DonChare with the title Beam Copier Kit to obtain the title Etou Beam. Hurtling Boys Oni is now returned to normal.
  5. With title Beam Copier Kit unlocked, Play Lightning Beams Ura Oni in Dark DonChare with the title Beam Copier Kit to obtain the title Neo Etou Beam. Lightning Boys Ura Oni is now returned to normal.
    • Step 4 and Step 5 may be done in reverse order.
  6. With both Etou Beam and Neo Etou Beam titles unlocked, Play in order Lightning Boys Ura Oni and then Hurtling Boys Oni in the same credit in Dark DonChare
REWARD
  1. Title: Beam Copier Kit (ビームコピーキット)
  2. Title: Edis Rehto eht ot Emoc (てきにらう)
  3. Title: Error: Beam Overload (エラー：過剰ビーム)
  4. Title: Etou Beam (エトウビーム)
  5. Title: Neo Etou Beam (ネオエトウビーム)
  6. Title: Anomaly of Etou Beam Neutralized! (異変 エトウビーム解消！)
  7. Title: Fastest: Etou Beam Neutralized! (最速 エトウビーム解消！) only to the first solver
Chapter-wide Reward
  1. Instrument: Dark Machina (闇のマキナ)
  2. Mini Character: Machina the DARK (Phantom Thief Ver.) (マキナthe DARK(怪盗Ver.))

Chapter 4 (2026/04/19)
Event QR Code
Anomaly 9 Prerequisite: Chapters 2 and 3 Completion
ANOMALY
  1. Machina and Machina the DARK did not say anything in the chapter announcement post on Twitter/X (link), unlike the previous three chapters
  2. Yell Ex Machina! lost its preview and subtitle and is replaced by a version sang by Machina the DARK
  3. Dark Ex Machina♡ lost its preview and subtitle and is replaced by a version sang by Machina
  4. Game Tips sometimes:
    マキナ「アンタさっさと助けなさいよ！」
    まきな「はわわ…わたしはいいので、マキナちゃんから助けてください！」
    マキナ「…！　いいわね？ウチらを同時に助けるのよ！！」
    Machina the DARK: "Hey you, don't wait and help me now!"
    Machina: "Owawa... I'm fine, so please start with helping Machina-chan (the DARK) first!"
    Machina the DARK: "...! Well then? Help both of us at the same time!!"
  5. Game Tips sometimes: 消滅の呪文を唱えよ Chant the incantation of annihilation
  6. Anomalous track: Help Ex Machina (ヘルプ・エクス・マキナ)
    • Unlocks in Solution Step 1 at the location where Yell Ex Machina! should be
    • Only dialogue between Machina and Machina the DARK, instructing the player to "collect [their] Fragments of Music (音楽の欠片) and revive [them]"
    • Notechart is only one large note at the end
  7. Anomalous track: Yell Ex XXXXXXX! (エール・エクス・◯◯◯！)
    • Unlocks in Solution Step 2 at the location where Yell Ex Machina! should be
    • Instrumental of Yell Ex Machina! without the voice of Machina
  8. Anomalous track: Dark Ex XXXXXXX♡ (ダーク・エクス・◯◯◯♡)
    • Unlocks in Solution Step 3 at the location where Dark Ex Machina♡ should be
    • Instrumental of Dark Ex Machina♡ without the voice of Machina the DARK
INFO
  1. After hours of zero progress, an additional reply post (link) was added to the chapter announcement post on Twitter/X at 16:09 JST, showing a partial note by "Anomaly Detective Etou" with the following hints:
    • Yell Ex Machina! and Dark Ex Machina♡ switched singers = they are "reversed"?
    • "Incantation of annihilation" → "annihilation" is the reverse of "revival"?
    • Look back on the anomalies so far → several anomalies may invoke the concept of "revival"...
  2. The secret command from Anomaly 3 is now labelled as "incantation of revival" (復活の呪文)
  3. Yell Ex Machina! quotes three other Namco Original songs in music and charts:
    • Future Lab
    • Mekadesu.
    • Dokidoki Munekyun Omatsuri Time
  4. Yell Ex Machina! quotes nine other Namco Original songs in music and charts:
    • Yuugen no Ran
    • Infinite Rebellion
    • Dairokuten Maou
    • poxei♦DOON
    • Vixtory
    • Zou'o to Shuu'aku no Hanataba
    • Shinryu
    • 23:54, Hi no Tabiji e no Prelude
    • vs.VIGVANGS (unreleased at the time)
SOLUTION
  1. Enter the secret command from Anomaly 3 before entering any mode, ensuring that all listed inputs are both mirrored and vertically reversed from the original code, in this way:
    （　）（１）（　）（１）
    （５）（　）（　）（　）
    （　）（　）（２）（　）
    （　）（９）（　）（　）
    （　）（　）（　）（３）
    A Taiko sound plays, a musical-notes with dotted outline icon appears on the bottom-right and both the reversed Yell Ex Machina! and Dark Ex Machina♡ are removed from the songlist, with the anomalous track Help Ex Machina appearing in their place
  2. With all tracks quoted by Yell Ex Machina! (see INFO Point 3) in the "Recently Played" folder, play New Revival Drumroll in Dark DonChare Chapter 2 to obtain the title Crystal of Yell. Yell Ex XXXXXXX! is now unlocked
  3. With all tracks quoted by Dark Ex Machina♡ (see INFO Point 4) in the "Recently Played" folder, play New Revival Drumroll in Dark DonChare Chapter 2 to obtain the title Crystal of Dark. Dark Ex XXXXXXX♡ is now unlocked
    • Step 2 and Step 3 may be done in reverse order.
    • Since the "Recently Played" folder only shows 10 tracks for one-player credits, it is impossible to complete both steps at the same time.
    • It is currently unknown whether two-player credits ("Recently Played" folder shows 20 tracks) will allow for both steps to be completed at the same time.
  4. With both Crystal of Yell and Crystal of Dark titles unlocked, play both Yell Ex XXXXXXX! with Machina as the instrument and Dark Ex XXXXXXX♡ with Dark Machina as the instrument in the same credit in Dark DonChare Chapter 4
REWARD
  1. Title: Crystal of Yell (エールの結晶)
  2. Title: Crystal of Dark (ダークの結晶)
  3. Title: Anomaly of MakiMaki Neutralized! (異変 まきマキ解消！)
  4. Title: Fastest: MakiMaki Neutralized! (最速 まきマキ解消！) only to the first solver

Chapter 5 (2026/04/20)
Event QR Code
Authentication Code
Unlike previous chapters where you must do specific things on Nijiiro ver. to gain event progress for yourself, Donders are tasked as a whole with figuring out a 16-digit authentication code from the anomalies and replying it (without the hyphens) to the QR Code post on Twitter/X (link) to unlock the next event QR Code (to be revealed within one business day).
ANOMALY
One out of four anomalous track will appear at the top of the Namco Original folder. The locale of the cabinet determines which track to appear. All four tracks use the song selection background music, but the notecharts are all different at all difficulties. All sixteen notecharts contains Morse Code secret messages (see INFO Point 3).
  1. Key No.1 (第1の鍵)
    • Confirmed locales: Taiwan
    • Ratings: ★2 / ★4 / ★3 / ★1
  2. Key No.2 (第2の鍵)
    • Confirmed locales: South Korea
    • Ratings: ★4 / ★2 / ★1 / ★3
  3. Key No.3 (第3の鍵)
    • Confirmed locales: Japan
    • Ratings: ★3 / ★1 / ★4 / ★2
  4. Key No.4 (第4の鍵)
    • Confirmed locales: Australia
    • Ratings: ★4 / ★1 / ★2 / ★3
INFO
  1. Answer the question in each Morse Code secret message to get a number. For questions that asks for a letter, symbol or kanji, use the closest-looking number.
  2. The star rating of each difficulty signifies which of the four slots in the key the corresponding answer should go.
  3. Morse Code secret message and answers after arranging in the correct order:
    • Key No.1 太鼓に使うバチは1組何本 → 2
      How many drumsticks in a set for use in taiko
    • Key No.1 1小節の長さを示す音符 → semibreve → 0
      Musical note that signifies the length of one bar
    • Key No.1 ノクターンラプソディーシンフォニー → Zero Series → 0
      Nocturne, Rhapsody, Symphony
    • Key No.1 始まりのカオスを挟みし記号 → !!!Chaos Time!!! → ! → 1
      Symbol that sandwiches the starting chaos
    • Key No.2 鼓立あおはる学園の縁の数 → 0 (only dons in Koritsu Aoharu Gakuen Kouka)
      Number of rims in Koritsu Aoharu Gakuen
    • Key No.2 太鼓の達人の同時プレイ人数 → 2
      Number of people that can play Taiko no Tatsujin at the same time
    • Key No.2 カレーライスにつけると挨拶になる漢字
      → おつカレーライス (3rd-gen. livestream greeting) → 乙 → 2
      Kanji which when placed on curry rice becomes a greeting
    • Key No.2 もうn曲遊べるドン nに入る数字
      → もう1曲遊べるドン (2nd-gen. arcade song transition) → 1
      "You can play n more song-don" Fill in n
    • Key No.3 今のバージョンの1文字目は何 → ニジイロVer. → ニ → 2
      First character of current version is what
    • Key No.3 演奏ゲームで流れる音符の形 → → 0
      Shape of notes scrolling in Performance Game
    • Key No.3 どんメダル春の1曲目1文字目 → ZOMEKI THUNDER → Z → 2
      First character of first track in Don Medal Spring
    • Key No.3 楽曲火ノ鳥はSORAシリーズ何曲目 → SORA-VI Hinotori → 6
      Which order is Hinotori in SORA Series
    • Key No.4 フルコンボした時の不可の数はいくつ → 0
      How many Bads when in a Full Combo
    • Key No.4 アーケードの略称の1文字目 → AC → A → 4
      First character of short form for "arcade"
    • Key No.4 ポラリスノートの中の小さな文字 → POLARiSNAUT → i → 1
      Small letter in "POLARISNAUT"
    • Key No.4 半音下げるを示す記号は何 → flat ♭ → 6
      Symbol that signifies half step lower is what
SOLUTION
2001-0221-2026-0416. The code has been confirmed receipt at 16:09 JST (link), unlocking the next QR Code to be revealed on 2026/04/21.

Community Challenge (2026/04/21)
Event QR Code
Community Challenge 2026/05/21 Completed
Achieve 876,000 songs played in the event mode.
  1. Donders do not have to neutralize any previous anomalies to participate
  2. Playing the same track multiple times will have all times counted
  3. Unlike previous chapters, score records achieved from the Community Challenge part will be kept
  4. Songs skipped using Performance Skip are not counted
  5. Update (2026/05/02): Songs played in the Extra Challenge are also counted
PROGRESS
  • 2026/04/22 12:00 JST: 24,368 (link)
  • 2026/04/23 12:00 JST: 47,530 (link)
  • 2026/04/24 12:00 JST: 67,599 (link)
  • 2026/04/25 12:00 JST: 96,317 (link)
  • 2026/04/26 12:00 JST: 140,414 (link)
  • 2026/04/27 12:00 JST: 181,723 (link)
  • 2026/04/28 12:00 JST: 204,513 (link)
  • 2026/04/29 12:00 JST: 231,038 (link)
  • Extra Challenge EX (Kiwami) unlocked: 250,000 songs played
  • 2026/04/30 12:00 JST: 271,977 (link)
  • 2026/05/01 12:00 JST: 296,821 (link)
  • 2026/05/02 12:00 JST: 327,922 (link)
  • 2026/05/03 12:00 JST: 368,559 (link)
  • 2026/05/04 12:00 JST: 401,347 (link)
  • 2026/05/05 12:00 JST: 435,025 (link)
  • 2026/05/06 12:00 JST: 467,484 (link)
  • 2026/05/07 12:00 JST: 500,218 (link)
  • Extra Challenge EX (Miyabi/Iki) unlocked: 520,000 songs played
  • 2026/05/08 12:00 JST: 521,056 (link)
  • 2026/05/09 12:00 JST: 544,881 (link)
  • 2026/05/10 12:00 JST: 590,530 (link)
  • 2026/05/11 12:00 JST: 633,352 (link)
  • 2026/05/12 12:00 JST: 657,939 (link)
  • 2026/05/13 12:00 JST: 680,394 (link)
  • 2026/05/14 12:00 JST: 702,347 (link)
  • 2026/05/15 12:00 JST: 728,569 (link)
  • 2026/05/16 12:00 JST: 752,110 (link)
  • 2026/05/17 12:00 JST: 794,591 (link)
  • 2026/05/18 12:00 JST: 833,828 (link)
  • 2026/05/19 12:00 JST: 854,568 (link)
  • 2026/05/20 12:00 JST: 874,726 (link)
  • 2026/05/21 12:00 JST: 889,017 (link)
  • Qualification for reward ends 2026/05/25 04:59:59 JST
REWARD
Title: Anomaly: Community Challenge Complete! (異変 みんなでチャレンジ達成！)
  1. Reward will be granted to all Donders who have contributed to the Community Challenge at a later date
  2. After the goal has been reached, the Community Challenge will continue to be active for some time. Donders may still be qualified for the reward by playing within that period

Extra Challenge (2026/05/01)
Authentication Code
Donders are tasked once again as a whole with figuring out a 9-letter authentication code and replying it (in one line) to the post on Twitter/X (link) to unlock the Extra Challenge event QR Code (to be revealed within one business day).
INFO
  1. The colored outer frame of the authentication code image resembles those of the "Donderful Combo!!" scrolls displayed at the Ranking Dojo corner, found in all "Donder Station" thematic corners as well as Namco Akihabara
  2. Such scrolls (except BBCC Kuala Lumpur) were found to have letters added to the top-right corner as early as 2026/04/28 (link)
  3. The letters on the scrolls (arranged by location from north to south):
    • Namco BiVi Sendai Station East Exit, Miyagi: C (link)
    • Bandai Namco Cross Store Koshigaya Laketown, Saitama: H (link)
    • Namco Akihabara: A (link)
    • Namco Nagoya Station Front, Aichi: O (link)
    • Bandai Namco Cross Store Kyoto: Z (link)
    • Namco Aeon Mall Kobe South, Hyougo: T (link)
    • Namco Hakata Bus Terminal, Fukuoka: I (link)
    • Namco Wonder City South Kumamoto: M (link)
SOLUTION
CHAOZTIME. The code has been confirmed receipt at 14:04 JST (link), unlocking the next QR Code to be revealed on 2026/05/02.
Event QR Code: EX (Kiwami)
Event QR Code: EX (Miyabi)
Event QR Code: EX (Iki)
Anomaly 10
ANOMALY
  1. Anomalous folder: Extra Challenge (エクストラチャレンジ)
    • Appears 11 times
    • Contents: !!!Chaos Time!!!, †††Chaos Time the DARK†††
    • Only Oni difficulty can be selected (other difficulties are greyed out)
    • Folder subtitle: 最狂に最恐で最強のカオスに挑め Challenge the strongest chaos at its scariest with the craziest
  2. All other folders and options have disappeared
  3. Anomalous track: Rough: CHA0Z
    • Replaces !!!Chaos Time!!! and †††Chaos Time the DARK††† in Extra Challenge folder after Solution Step 1
      Note: Available in two-player credits even if only one player has completed Solution Step 1
    • Only Oni difficulty can be selected (other difficulties are greyed out)
    • All gameplay modifiers (Speed, Doron/Hidden, Abekobe/Reverse, Random) are greyed out and cannot be changed
INFO
  1. Official points to note warns that "EX (Kiwami)" version is of unprecedented difficulty, requiring an extreme level of drumming performance skills in addition to just anomaly investigation. Alternate versions that requires less drumming performance skills, "EX (Miyabi)" and "EX (Iki)", will be gradually released based on challenge status.
  2. After hours of zero progress, an additional reply post (link) was added to the chapter announcement post on Twitter/X at 16:09 JST, showing a partial note by "Anomaly Detective Etou" with the following hints:
    • "Strongest" (最強) → Oni difficulty
    • "Craziest" (最狂) → random → Detarame
    • "Scariest" (最恐) may not be related to speed (did not mention "fastest"), Doron or Abekobe
    • Look back on the anomalies so far, likely required to play both tracks in one credit
    • Would achieving **that** for both tracks together be too scary...?
  3. Together with the announcement of the "EX (Miyabi)" and "EX (Iki)" versions (link), the full solution is also revealed (with the title of the final track hidden).
SOLUTION
  • Requires Detarame/Whimsical modifier for all steps in "EX (Kiwami)" version
  • Requires Kimagure/Messy modifier for all steps in "EX (Miyabi)" version
  1. Donderful Combo both !!!Chaos Time!!! Oni and †††Chaos Time the DARK††† Oni in the same credit in Dark DonChare Extra Challenge (in any order)
    Note: Can be optional only in two-player credits, if the other player has completed Solution Step 1 to make the Step 2 track available
  2. Donderful Combo Rough: CHA0Z Oni in Dark DonChare Extra Challenge
REWARD
  1. Title: Anomaly of Chaos (Kiwami) Neutralized! (異変 カオス(極)解消！) for "EX (Kiwami)" version
  2. Title: Anomaly of Chaos (Miyabi) Neutralized! (異変 カオス(雅)解消！) for "EX (Miyabi)" version
  3. Title: Anomaly of Chaos (Iki) Neutralized! (異変 カオス(粋)解消！) for "EX (Iki)" version
  4. Track Unlocked: Rough: CHA0Z
  5. Title: Fastest: Chaos Neutralized! (最速 カオス解消！) only to the first solver of any version
    Note: Due to technical limitations, only this title can be granted by the game right when the anomaly is neutralized. The following first-solver titles will have the title granted manually at a later date.
  6. Title: Fastest: Chaos (Kiwami) Neutralized! (最速 カオス(極)解消！) only to the first solver of "EX (Kiwami)" version
  7. Title: Fastest: Chaos (Miyabi) Neutralized! (最速 カオス(雅)解消！) only to the first solver of "EX (Miyabi)" version
  8. Title: Fastest: Chaos (Iki) Neutralized! (最速 カオス(粋)解消！) only to the first solver of "EX (Iki)" version

Additional Info
Unresolved Anomaly(?)
Alternating rim hits on the title screen (before entering any mode) activates a "Missed input!" (ハズレ!) speech bubble, similar to AC11. It is unknown whether it is only a hint for Anomaly 3 or has further implications.
Challenge! DonChare 2026
It was speculated that the anomalies were related to the mission tracks of Challenge! DonChare 2026:
  1. Hello! Don-chan and instrument Wada Don
  2. Kikyoku, one of the earliest tracks with Ura notechart
  3. Hibike! Taiko no Tatsujin, with Ura notechart unlockable via secret command in AC12
  4. TENSEI -Kiyoshi ga Matsu Tsuwamono- references Grandpa, the host of Ranking Dojo
  5. Yuugen no Ran, with first public reveal in Nippon-ichi Ketteisen 2013
  6. Dokidoki Munekyun Omatsuri Time, widely recognized with its abundance of drumrolls
  7. Joubutsu 2000, part of the 2000 Series
  8. Seigaitten, introduced via music recruitment contest like Hurtling Boys, the source of Etou Beam, as well as the first new track of the calendar year like Chinese Zodiac Series
  9. Yell Ex Machina! and Dark Ex Machina♡
  10. !!!Chaos Time!!! and †††Chaos Time the DARK†††
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