- The name of the game, Cytus, actually comes from the name Cocytus, which means "the river of wailing" in ancient Greek mythology.
- In the update 7.0, many songs from early chapters (Chapter 1 to 3) have their charts remade, due to the serious off-sync between the audio and the chart. Certain old charts had bad design as well. Many of the charts remade have a much faster Scan Line BPM and better chart quality as compared to the old charts.
- Although not displayed in the game itself, Cytus actually records play data in its save files, including how many times a song has been played, or the exact highest TP score up to 15 decimal places.
- NeLiME, the composer of First Gate, Gatorix, Codename : Zero and Leviathan, was a high school student when he composed the songs.
- ensou, the composer of COMA, is from Philippines and he is a Tagalog Rock Vocaloid producer, with all of his songs featuring the Vocaloid GUMI. (except for the song "Entropy"; it features the Vocaloid 初音ミク.)
- Vospi, the composer of Reverence and Do Not Wake, is from Russia.
- Project Grimoire is a team consisting of 3 Japanese illustrators, and 2 composers, Verdammt and ICE. Due to an incident with BEMANI, Brionac ended up in Cytus instead. The cover image was drawn by the 3 illustrators, which were requested by ICE. The name of the illustrators are Yūkyū, Yako, and Tetsu.
- All of their members are from Japan. (Except for ICE, he is from Hong Kong.)
- Their other members are Amukko, Yooh, and ke-ji (Which is all members of Team Grimoire). (Note that one of Yooh's aliases is BlackYooh/BlackY)
- Eyemedia's Alive: The Beginning has a faster version that plays in the results screen, and the original version was used for the title screen before Alive: Loom was used.
- M2U is credited for helping in the composition of Predawn, which was mainly composed by NICODE, in update 7.0.
- Hoskey is the only artist in Cytus to have his spelling changed. His name was originally in all caps until Chapter 8 and Cytus Lambda.
- Searlait and Yoneko, the singers for Knight of Firmament, Lord of Crimson Rose and The Fallen Bloom, are actually from Taiwan even though the lyrics of the songs are in Japanese.
- sakuzyo won the team title with VALLISTA, Neurotoxin and Laplace in BOF2011 (all three songs were composed and mapped into charts by himself).
- Killerblood specialises in retro songs. One of the shooting NES game is the inspiration for most of his songs, especially Musik, which happens to be his favorite work of his own in Cytus. His favorite composer other than himself is ICE, and his favorite song from ICE is Entrance.
- ICE has the most number of songs that have a difficulty of 9 including Easy difficulty, with a total of 38 (including hidden versions).
- Haloweak and KyuRu are the only two composers from mainland China.
- The following table lists the number of songs of the Artists:
|No. of song(s)||Artist(s)|
|1 song||AILE, LOW PASS, Hero_C, Nocturne Moonrise, Haloweak, Ric, orangentle, Baroque, ginkiha, Project Grimoire, Shinichi Kobayashi, ensou, Qrabit, KyuRu, Presti, Mai Aoyagi, Yuk-cheung Chun, Kevin Penkin|
|2 songs||Ice Bird, Alpha Legion, aioi, EBICO (Including 1 with jioyi), Vospi, Bro's, Verdammt/Project Grimoire (Including 1 with ICE/Project Grimoire), SHK, siromaru(Including 1 with Cranky)|
|3 songs||Switchworks, DJ Mashiro (Including 2 songs with 3R2), Kiryu, jioyi (Inluding 1 with EBICO), KIVΛ, NICODE and M2U, V.K.|
|5 songs||3R2 (Including 2 songs with DJ Mashiro), NeLiME (including 1 song with Presti), HAMO/MILI|
|6 songs||ani, Tsukasa, naotyu-/Suzumetune|
|7 songs||Yamajet, xi (Including 1 with sakuzyo), Killerblood, Persona, sakuzyo (Including 1 with xi)|
|9 songs||Eyemedia (including 4 songs by Eyemedia members in Chapter K), Rabpit|
Video Games Orchestra
|22 songs||ICE/Project Grimoire (Including 1 with Verdammt/Project Grimoire)|
|This makes ICE the artist with the most songs in Cytus.|
- Before Cytus 9.0 came out, Sta had the most songs at 13 songs.
- The song playing in the title screen is the short version of Alive: Loom.
- The original song playing in the title screen was Alive: The Beginning.
- Every song in Chapter S is a remix of an orchestral piece in history, thus a theme used for Project Symphony (tentative title), one of Rayark's games under development.
- Nocturnal Type by switchworks is the song used in the in-game tutorial of Cytus.
- Halcyon and Conflict are winner songs of BOF in 2010 and 2011.
- Hercule is the only naotyu- song that doesn't have vocals.
- Knight of Firmament and Lord of Crimson Rose are the only Eyemedia songs that have a singer.
- First Gate Overdrive and Conflict are two hidden songs that have a preview song once they're activated.
- ∅ (Slit), along with its hidden versions, ∞Fields and ¡Azucar! have their title begin with a symbol.
- L and Q only have a single letter as their title.
- Alive: The Beginning is the shortest song in Cytus at 1:18, while LNS OP is the second shortest song, at 1:33.
- Evil Force and Infernus both have the same minor key, which is D minor.
- Chapter L has the most number of songs which have hidden version(s) in the game (10 songs).
- Qualia refers to individual instances of subjective, conscious experience. The cover photo in negative colours looks a lot like Earth.
- Area184 and Area184 -Platinum Mix- have BPMs of 184 (Reference to their song titles), while Freedom Dive has a BPM of 222.22 with 1222 notes in hard mode (A reference to its BPM).
- The girl in the title card of Freedom Dive is called Kurante, which would be Current when translated into English.
- L2 : Ascension To The Upper is the longest song in Cytus at 7:37.
- The most common BPM in Cytus is 180, with a grand total of 18 songs having this BPM. The second most common is 160, with 13 songs having this BPM.
- The title of some songs can be in different languages. For instance, they could be in English (the most of them), French (Les Parfums de L'Amour), German (Zauberkugel), Italian (Vivere La Vita), Japanese (Saika), Chinese (Hua Sui Yue) etc.
- The lyrics of some songs can be in two or more diffirent languages or functional language.
- Undo is the only song in Cytus sung in Mandarin.
- Mandora is a creature in another game with the same name of Rayark Inc., and is featured on the title covers of nine songs, namely Hot Air Balloon, Hey Wonder, VitMaster, The Way We Were, Sweetness Overload!!!, Afterglow, Les Parfums de Celebrez, Phubbing and Rebirth.
- Some songs in Cytus were already part of other rhythm games, like BMS, Mozarc and o2Jam.
- COMA by ensou and Undo by Yuk-cheung Chun are the only songs in Cytus that are not sung in full English or Japanese, but instead in Tagalog and Mandarin, respectively.
- There are some songs that have their names changed completely when their hidden version is accessed, these songs being The Ricochet, Magnolia and Hay Fields (changed to The Long Years, Myosotis and ∞Fields respectively).
- The Ricochet appears to have small images of Cytus being played on the bottom left and right corners of the art.
- In The Ricochet, you can hear the word "The Ricochet" sometimes in the middle of the song.
- Money & Money is the only Chapter T song to be a remix.
- Catastrophe contains the Rayark logo in the background, along with the name Valkyrie, a reference to VOEZ, another game by Rayark (The OBB folder of VOEZ, which is com.rayark.Valkyrie)
- L is the only song to use one of its hidden songs (L2 - Ascension: Act 1 (Loneliness)) as the preview song.
- All of Chapter L's hidden songs are the same as the non-hidden ones. This is exclusive to Chapter L.
- The Blocks We Loved and Q have the biggest level gap between Easy and Hard, which is 7, being Easy Lv2 and Hard Lv9.
- Coincidentally, they are also the only two level 9 songs that don't have drag notes.
- I race the dawn also has the biggest level gap between Easy and Hard, which is 7 being Easy Lv1 and Hard Lv8.
- Saika ver.B is the only song which has a hard chart accessed via a red start ring but isn't a level 9 chart.
- Stardust Sphere has triple tap notes on Easy.
- L3 : Roar, On The Deserted Lands(Old Version) is the song with the most notes on both difficulties, with Easy having 1873 and Hard having 2073.
- The Easy chart on L10 : In Memory of Maneo (New Version) is the only one with no click notes.
- This makes it the only chart that can be MM'ed without having your hand leaving the screen.
- The Fallen Bloom is the only song to have a cutscene that isn't a part of Cytus:Alive.
- Alive: The New World is the only song to have a Hard level of less than 4. With update 7.0, no songs have difficulty of 2 or 3 under hard mode.
- Stardust Sphere and L3 : Roar, On The Deserted Lands have three-fingered slide notes.
- L9 : Meteo - Mourn has four-fingered hold notes.
- Darkness and most songs in Chapter L have quadruple tap notes.
- L9 : Meteo - Mourn (Old Version) has the most triple notes in one frame, with 8 groups of triple notes, and L10 : In Memory of Maneo (Old Version) has the most quadruple notes in one frame, with 4 groups of quadruple notes.
- Chapter L has the most number of charts that has a level of 9, which has 28 charts. Second is Chapter M, which has 11 charts.
- Chapter 1, Chapter 3, Chapter K and Cytus:Alive are the only chapters that have 1 song that is Level 9. They are Ververg ver.B, Halcyon, The Red Coronation and Vanessa on Hard respectively.
- Many songs have changed in this game, but some songs only change their levels like Libera Me (Lv. 9 - Lv. 7 in Hard Mode, no changes in notes) and Masquerade (Lv. 8 - Lv. 9 in Hard Mode, also, no changes in notes) -> Read more: Songs that have changed.
- Excluding hidden songs and Chapter L, Alive: The New World and L are the only songs that have the same difficulty on Easy and Hard. (1/1 and 9/9 respectively)
- In Chapter L, every chart, both on Easy and Hard, has a combo that's final digit matches its song number. Example: L3 : Roar, On The Deserted Lands has 1873 notes (903 in the remade chart) on Easy and 2073 notes on Hard.
- L3 : Roar, On The Deserted Lands (New Chart) has the highest note difference between difficulties, which is 1170. The lowest is Alive: The New World, which is 0.
- Some songs' max combos have repeating digits, namely The Way We Were (Easy, 333) Rainbow Night Sky Highway (Hard, 555), Future World (Hard, 666), Quantum Labyrinth (Easy, 333), Ververg (Hard, 444), Light up my LOVE (Easy, 222), Chocological (Easy, 333) and Operators (Easy, 33).
- Do Not Wake and The Blocks We Loved are the only two Level 9 songs which is physically possible to Million Master with one finger only.
- Infernus (Level 8), Q (Level 9), The Blocks We Loved (Level 9) are the highest leveled songs possible to achieve MM+TP70, which means no coloured perfects.
- This is because a slide note always end with a coloured perfect unless it is not touched, which results in a miss.
- These song are also possible to FC+Score700k, which means no perfect - only good(because every circle of a slide note isn't score good or bad - only perfect or miss).
- Some songs have groups of notes that resemble letters, numbers, or things. The following table lists the songs have group of note resemble letters, numbers, or things:
|Area184||Ending of Hard mode||The pattern of the notes form A, R, E, A, 1, 8, and 4.|
|Halloween Party||Easy mode||Drag notes form the number 31, referencing the fact that Halloween is most commonly celebreated on October 31st.|
|Combo 530, Hard mode||The notes form the face of a Jack-o'-lantern.|
|Do Not Wake||Near-end part of Hard mode||There are some note groups which resemble the letters D-O-N-O-T-W-A-K-E.|
|Twenty One||Near-end part of the song on both difficulties||2 groups of drag notes at the end resemble the number 21.|
|Holy Knight||Middle of Hard mode||There are hold and drag notes that resemble K.|
|Brionac||Middle of Hard mode||Four note groups form the word PROJ, which refers to the artists of Brionac, Project Grimoire.|
|Conflict||Middle of Hard mode, After the 3 3-finger note groups||There is a group of drag notes that form the letter C.|
|Halcyon||The near-end part of Hard mode||Tap notes and slide notes form the Cycon for this song.|
|To Further Dream||Middle of Hard mode, before combo 475-500||Drag notes form a countdown: 6, 5, 4, 3, 2, 1 and an 8-note group forms the number 0.|
|Codename : Zero||Near-beginning and near-end of Hard mode||A group of drag notes form the number 0.|
|Entrance||At the end of Hard mode||Drag notes form a dollar sign ($), referring to the words "Money money give money" written behind the wings.|
|∅ (Slit) O||The near end of hard mode||A group of taps and drags forms the cycon of the song (∅).|
|Area184 -Platinum Mix-||Combo 212-331, Hard mode||Similar as Area184, patterns of notes form A-R-E-A-1-8-4-P(P stands for Platinum).|
|GENESYS||The middle and the end part of Hard mode||A group of drag notes form the Rayark logo.|
|After the Bloody Purity part||A group of drag notes form the letter 'B'|
|Masquerade||In the middle of the song on Hard mode||Many group of notes form a butterfly.|
|Magnolia||In Easy mode||Drag notes form the letter M.|
|L1: The Devastated Lower (old version)||Near-end part of the song on both difficulties||2 group notes forms the letter L and 1.|
|L2 : Ascension To The Upper (old version)||Near the middle, combo 907-917 on hard||A group of drag notes and click notes form the number 2.|
|L3 : Roar, On The Deserted Lands (old version)||Near-end part of the song on hard||2 group notes forms the letter L and 3.|
|L4 : The Unrevealed (old version)||At the beginning, combo 86-96 on hard||A group of click notes form an IV (The Roman numeral for 4)|
|L8 : Meteor - Farewell (new version)||In the middle and at the very end of easy||2 sets of drag notes forms the number 8.|
|L8 : Meteor - Farewell (old version)||At the last part of both difficulties||2 group notes forms the letter L and 8.|
|L9 : Meteo - Mourn (new version)||Near the beginning, about combo 250||A set of drag notes and a hold note form an IX (The Roman numeral for 9).|
|At the very end||2 hold notes, one short, one long, overlap creating a sword-like visual. It is repeated few times.|
|L9 : Meteo - Mourn (old version)||Near the climax, at the end||A zig-zag of many drag notes overlap a long hold note. The drag notes shape a heart, and the hold note resembles the sword that's pierced the heart of the character in the cover art. This pattern also closely resembles an upside-down version of the cycon for L10: In Memory of Maneo.|