Schrodinger no neko

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This page is for the Cait Sith song titled シュレーディンガーの猫. For the Brian the Sun song of a similar title, please see Schrodinger no neko (Brian the Sun).


Song Information

シュレーディンガーの猫's pop'n music banner.
シュレーディンガーの猫's jacket.

Artist: Cait Sith
Composition/Arrangement: TOMOSUKE
BPM: 187
Length: 1:53
Genre: TOY CONTEMPORARY (トイコンテンポラリー)
pop'n music Character: TENT-KANT [16]
pop'n CG designer: shio
Movie: VJ GYO
First Music Game Appearance: pop'n music 16 PARTY♪
Other Music Game Appearances:



Song Connections / Remixes


  • シュレーディンガーの猫 is the Above outdoors' stage unlock of pop'n music 16 PARTY♪'s Atsumare! pop'n PARTY♪ (あつまれ!ポップンパーティー♪) event. It could be unlocked from July 2nd, 2008.
    • From August 6th, 2008, it is available by default.
  • Schrödinger's cat is a thought experiment devised by Erwin Schrödinger in 1935. The scenario presents a cat that may be both alive and dead, depending on an earlier random event.
  • シュレーディンガーの猫's pop'n music charts were created by TOMOSUKE himself [2].
    • シュレーディンガーの猫's EX chart was the first chart rated Level 43 (on the old 1-43 scale) that originated in an arcade pop'n music game. However, pop'n music 18 せんごく列伝 later changed to Level 43 the EX charts of three arcade songs that were released before シュレーディンガーの猫: ブタパンチのテーマ, Übertreffen, and neu.
      • シュレーディンガーの猫's EX chart has a Spicy Gauge.
  • シュレーディンガーの猫 appears in beatmania IIDX 20 tricoro and REFLEC BEAT colette -Summer- as part of the Q-pro, Mimi, Nyami & Pastel-kun no minna de uchuu sensou!! (クプロ・ミミニャミ・パステルくんのみんなで宇宙戦争!!) unlock event, which started on July 29th, 2013.
  • When シュレーディンガーの猫 is played in beatmania IIDX, the LED ticker displays "SCHRODINGER'S CAT".
    • Before beatmania IIDX 22 PENDUAL, the LED ticker displayed "SCHRODINGERS CAT", without the apostrophe.
  • In pop'n music éclale, the shape of TENT-KANT's star on its head was changed from a six-pointed star to a five-pointed one.
  • シュレーディンガーの猫 received an EASY chart in pop'n music éclale on December 21st, 2015.
  • After being removed from the initial release of REFLEC BEAT 悠久のリフレシア, シュレーディンガーの猫 was revived on February 2nd, 2017.
  • シュレーディンガーの猫 is one of DanceDanceRevolution A's EXTRA SAVIOR DDR 20th Anniversary Songs, as part of the DanceDanceRevolution A × pop'n music peace 20th Anniversaries event. It can be unlocked from November 15th, 2018.
    • The BEGINNER and BASIC charts are available by default, but DIFFICULT onwards need to be unlocked, in order, via EXTRA SAVIOR.
    • As of DanceDanceRevolution A20, it is available by default.
  • シュレーディンガーの猫 is the third song in DanceDanceRevolution to have charts rated Level 18 that lack BPM changes, stops, and Shock Arrows, following Prey and 嘆きの樹.
  • シュレーディンガーの猫 is available in beatmania IIDX INFINITAS as part of the beatmania IIDX INFINITAS Music Pack vol.5 (beatmania IIDX INFINITAS 楽曲パック vol.5).
  • シュレーディンガーの猫 is available in コナステ ノスタルジア as part of Konasute NOSTALGIA pop'n music Selection Music Pack vol.1 (コナステ ノスタルジア pop'n music セレクション楽曲パック vol.1).
  • シュレーディンガーの猫 is one of the unlocks of ノスタルジア Op.3's Goudou ongaku-sai pop'n music selection (合同音楽祭 pop'n music セレクション) event. It could be unlocked from September 29th to November 17th, 2022.
    • It could be unlocked again from March 16th to April 26th, 2023, and from November 2nd to December 21st, 2023.
  • シュレーディンガーの猫 received a Real chart in ノスタルジア Op.3 on November 2nd, 2023.
  • シュレーディンガーの猫 is available in pop'n music Lively as part of pop'n music Lively Music Pack vol.13 (pop'n music Lively 楽曲パック vol.13).
  • シュレーディンガーの猫 is available in DanceDanceRevolution GRAND PRIX from December 21st, 2023, by purchasing the GRAND PRIX music pack vol.23 (グランプリ楽曲パック vol.23).
  • シュレーディンガーの猫 is available in SOUND VOLTEX EXCEED GEAR コナステ from March 13th, 2024, by purchasing the Konasute SOUND VOLTEX BEMANI Selection Music Pack vol.1 (コナステ版 SOUND VOLTEX BEMANI セレクション 楽曲パック vol.1).

Music Comment

If you hold too much on one thing, you will lose sight of everything, nya

Song Production Information

Cait Sith


There is more than one correct answer.
There was never a correct answer to begin with.

People always try to rely on something.
We sometimes think that is necessary to rely on something for a person to be who he or she is.

However, when things are considered on the most microscopic level, the behavior of elementary particles is nothing but random.

You encounter the paradox that if you settle on one view, you lose sight of everything else.

That would be the logic of "Schrödinger's Cat" in a nutshell.

In other words, it is up to you to decide how to deal when you encounter something you don't understand.

Do you accept it as a new and incomprehensibly high level of difficulty, or accept it as a relative understanding of the reasons for the other higher difficulty songs? Whether it makes sense to conquer all the songs or not, I'd rather you go out with me if you get a full combo on TOY CONTEMPORARY! Whether to use it as a pick-up line or not...

It's "FREEDOM-NYAAAAAAAAAAA-------------!".

Because there was never a right answer--

...I wrote this song to encourage everyone to be flexible and have a broader perspective.
This song contains a variety of ideas that can be taken in different ways.
It could be the charts, the tune, the song title and comments, the cat or animal voices....
Overall, the charts were created to be very challenging.
I also incorporated a feeling that has never been seen before in the arrangement, to give the audience a sense of surprise when they first played this song, so I made the tune complex, with rapid changes in development and beat.
However, I mustn't forget that it's a pop'n song, so I made it with the aim of becoming the most fun and crazy boss that I think of in pop'n!

I hope that in many ways, the name of this song will be engraved in the long history of pop'n music.

Character Information


We received an order from Mr. Cait for a "Dadaist" look, so we took a detour with "Oui, monsieur" and came up from the clouds with a gentleman with Magritte taste.
"It is as beautiful as a chance encounter between a sewing machine on an operating table and a rain umbrella." So please enjoy the poetic and surrealistic world view.
I hope I can also bring out the smoothness of his enchanting hand movements, which is typical of a magician.
He not only does magic, but also tap dances. Mr. Tent is truly a master of his craft.

The circus moves through the city. Very mysterious.
What's going on inside the tent? I want to know. I want to see.
The children's curiosity is excited.
But if you accidentally open the door...
It could be a big, unthinkable deal. Nya.

Video Production Information


Difficulty & Notecounts

beatmania IIDX difficulty rated from 1 to 12.
DanceDanceRevolution difficulty rated from 1 to 20 from X onwards.
pop'n music difficulty rated from 1 to 43 through pop'n music 20 fantasia, and 1 to 50 from Sunny Park onwards.
REFLEC BEAT to groovin'!! Upper difficulty rated from 1 to 10+, 1 to 13 in VOLZZA/VOLZZA 2, and 1 to 15 in 悠久のリフレシア.
SOUND VOLTEX difficulty rated from 1 to 20 from IV HEAVENLY HAVEN onwards.
ノスタルジア difficulty rated from 1 to 12 for Normal to Expert charts. Real charts rated from 1 to 3 diamonds (◆).
ポップンリズミン difficulty rated from 1 to 10. (Ratings and notecounts obtained from Pop'n Music Fever and BEMANIWiki 2nd.)

beatmania IIDX

Game SP Difficulty DP Difficulty
Notecounts - 580 1231 1717 - 614 1198 1685 -
beatmania IIDX 20 tricoro→Present - 6 10 12 - 7 10 12 -
beatmania IIDX INFINITAS - 6 10 12 - 7 10 12 -
beatmania IIDX ULTIMATE MOBILE - 6 10 12 - - - - -


Game Single Double
Beginner Basic Difficult Expert Challenge Basic Difficult Expert Challenge
Notecounts / Freeze Arrows / Shock Arrows 162 / 9 265 / 27 411 / 13 591 / 10 788 / 7 / 0 258 / 21 401 / 15 568 / 12 742 / 7 / 0
DanceDanceRevolution A→Present 6 9 12 15 18 9 12 15 18
DanceDanceRevolution GRAND PRIX 6 9 12 15 18 9 12 15 18

pop'n music

Game Normal Mode Battle Mode PSP Exclusive
Notecounts 299 616 1238 1748 399 469 469 519 1307
pop'n music 16 PARTY♪→20 fantasia ※19 26 39 43 17 23 - - -
pop'n music Sunny Park→ラピストリア - 32 45 ↑50 17 23 - - -
pop'n music éclale→Present 17 32 45 50 17 23 - - -
pop'n music portable 2 ※14 26 39 43 - - 19 23 41
pop'n music Lively 17 32 45 50 - - - - -

※ Denotes chart is different from the EASY chart:

  • pop'n music 16 PARTY♪→20 fantasia 5-Buttons chart: total notes: 469.
  • pop'n music portable 2 5-Buttons NORMAL chart: total notes: 301.


Old Charts

Game Level
Basic Medium Hard Special
Notecounts 269 450 838 -
REFLEC BEAT colette -Summer-→groovin'!! Upper 5 8 10+ -
REFLEC BEAT plus 5 8 10+ -

New Charts

Game Level
Basic Medium Hard White
Notecounts 313 459 855 -
REFLEC BEAT 悠久のリフレシア 7 10 14 -


Game Level
Max Chain (EXCEED GEAR→Present) 774 1196 1629 2379 -
Effected By レッドキャットスクリューズ レッドキャットスクリューズ レッドキャットスクリューズ レッドキャットスクリューズ×~PH -
Jacket Artists shio shio shio shio -
SOUND VOLTEX EXCEED GEAR コナステ 7 14 17 19 -


Game Level
Normal Hard Expert Real
Notecounts 468 856 1484 1859
コナステ ノスタルジア 5 8 12 -
ノスタルジア Op.3→Present 5 8 12 ◆3


Game Difficulties
Normal Hyper EX
Notecounts 266 435 757
ポップンリズミン 5 8 10
Stage 1 NA NA NA ロケンロー・キング - Runnin' Away - Hearty Party - Kicky Kemari Kicker - Quick Master -Naked Trance Mix-
Stage 2 Days - にゃんだふる55 marble version - 華爛漫 -Flowers- - the keel (Nu-Style Gabba mix) - SPICY PIECE (Ryu☆Remix)
Stage 3 Dance to Blue - カーニバルの主題による人形のためのいびつな狂想曲 - SigSig - たまゆら - 大見解の新見解
Stage 4 タンバリンビーツ - HAGOROMO - CHIP'N'RIDDIM - Blind Justice ~Torn souls, Hurt Faiths~ - 繚乱ヒットチャート
Outdoors' stage Left: バイキングマン - 20,november - V
Right: Little Rock Overture - 万物快楽理論 - ポルターガイスト
Above: シュレーディンガーの猫
Universe stage Have a good dream.
HELL course songs
HELL 1-5 I'm on Fire - すれちがう2人 Millennium mix - R.C. - 西新宿清掃曲
HELL 1-5 ReNew すてきなタブーラ - 水中家族のテーマ - お江戸花吹雪 TEYAN-day MIX - Concertare
HELL 6 Midnight Yoghurt(女SPY☆お色気ゴーゴー脱出大作戦) - 작은행복 - H@ppy Choice - 大見解
HELL 7 Denpasar - SA-DA-ME - 夜間行 - Ending theme of pop'n music 6
HELL 6-7 ReNew Maritare! - The tyro's reverie - 悲しいね - 夜間行
HELL the EIGHT ♥LOVE² シュガ→♥ - Over the night - pure - 釈迦
HELL 9 Dynamic! Atomic! S.C.B.G. ~ver.1~ - デパ地下のお話 - 男々道 - ブタパンチのテーマ
HELL 10 明鏡止水 - Jack - Holy Forest - ULTRA BUTTERFLY(坤剛力)
HELL-11 - 怒れる大きな白い馬 - カゲロウ - でんがなマンガナ
HELL 12 - Vairocana - 進め!爺ちゃん! - 雪上断火
HELL 13 BAROQUE HOEDOWN - HypArcSin(x) - 文明開化 - ƒƒƒƒƒ
真HELL 13 フリーパス - KING of the SEA - Sanctum Crusade - 真超深TION
HELL 14 hora de verdad - BBLLAASSTT!! - 猿の経 - Übertreffen
HELL 1~14 Vairocana - ULTRA BUTTERFLY(坤剛力) - ブタパンチのテーマ - Übertreffen
HELL 15 Votum stellarum -forest #25 RMX- - 天庭 - ZETA〜素数の世界と超越者〜 - neu
HELL 16 バイキングマン - CHIP'N'RIDDIM - 万物快楽理論 - シュレーディンガーの猫
HELL 17 ƒƒƒƒƒ op.2 - 突然ゴルゴンゾーラ - Geiselhaus - 音楽
せんごく地獄 蛇神 - 西軍||∴⊂SEKIGAHARA⊃∴||東軍 - NOBUNAGA -
HELL TUNE STREET Remain - BabeL ~Grand Story~ - BabeL ~Next Story~ - BabeL ~roof garden~
HELL fantasia Southern Cross - カラルの月 - Eine Haube ~聖地の果てにあるもの~ - 少年は空を辿る
HELL Sunny Park コドモライブ - 背徳と邪悪のエピタフ - 生命の焔纏いて - 生命の環を紡いで
beatmania IIDX Unlocks SHION - 梅雪夜 - 音楽 - examination leave - - VALLIS-NERIA - シュレーディンガーの猫 - Valanga
pop'n music Unlocks メイメツ、フラグメンツ - 梅雪夜 - 天空の夜明け - ストレイ・マーチ - 灼熱Beach Side Bunny - Daily Lunch Special
キャトられ♥恋はモ~モク - Valanga
REFLEC BEAT Unlocks Devilz Staircase - ZETA~素数の世界と超越者~ - Proof of the existence - コドモライブ - perditus†paradisus
少年は空を辿る - キャトられ♥恋はモ~モク - シュレーディンガーの猫
Final Song Zirkfied