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The game features some maps showcasing references to other games. 
Below is information of all the games, sorted by release year.
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[2004]
Madotsuki - Yume Nikki

[2007]
Urotsuki - Yume 2kki

[2009]
Sabitsuki - .flow

[2010]
Usotsuki - Yume Nisshi
Fluorette - Answered Prayers
Yume Wo. - Nagatsuki
Yon Goh - Witoru
Kazaguruma - Kudaranu Mousou No
Jose - Kudaranu Mousou No
Yomika - Yume Graffiti

[2011]
A - nostAlgic
Eric. - UBOK.
Tatsuki - Debris
Lefia - Debris
Rei - Musuu
Shimitsuki - If
Irene - the looking glass
Dokutsuki - Broken Bottles


[2012]
Itsuki - Someday
Sometsuki - Ultra Violet
Naoto - Acatalepsy
Qiu Qin - Dream Genie
Kikei - Anamorphosis
N/A - Single Line
Lee Jin Hui - Mong Jung Mong
Moyatsuki - Kyomu
Aitsuki - Kind Heart
Doug Bigham - Gnosis

[2013]
Suzutsuki - TRIAL
Soutarou - Mikan Muzou
Hazuki - E Nikki
Hirosae - Yume Nichiroku
Muma - Muma Rope
Mukuro - Soul Song
Xuan Wozi - Sewage
Ava - Iter Itineris

[2014]
Kodama - Hana no Chiruramu
Ying Zi - Phobia
Motatsuki - device
Conrad - .B.P.
Hua Ju - August 31
Isaac - Mizu
Reney - jourNEY REcord
Pershina - Genseki Wakusei
Inahoozuki - De I Cide
Ginmokusei - De I Cide

[2015]
Kubotsuki - Uneven Dream
Totsutsuki - Uneven Dream
Yakitsuki - withers
Nire - Yuque
Satotsuki - Yume Kayoi
Kotozuki - Yume Kayoi
Yoruzuki - Maeyono

[2016]
Yatsuki - Shirushi

[2017]
Modori - ShamaL
Tyran - Mesonoxian

[2018]
Irving - Oversomnia
Alexei - I Had The Strangest Dream, Ivan
Hanatsuki - Re:in
Tamashitsuki - Re:in
Cheryl - Hope
Yugano - Akashi
AI - Dialogue
Akira - Returning Nightmares

[2019]
Danaë - Amillusion
Noelia - She Awaits
Makitsuki - Yume Tagai
Sakiyuki - Yume Tagai

[2020]
Sumitsuki - Ephemreal
Joshua - Wishful Thinking
yukiko - Void
Nuitsuki - Me・llow
Akagami - Me・llow
Nonoka - blooms
Kiribana - blooms
Mariana - Deep Dreams
Geoff - Motel Snooze
Evan Meyer - Mendum Memoria

[2021]
Cathy - INSULTED
Cygnus - ISO
Musubitsuki - Bullseye (◎)
Sanpurutsuki - Scary Nikki
Kataochi - psyder
Ginji Suzumoto - Tokyo purgatorio
Edel - Daughter
Nrutaz - RepresaL

[2022]
Hizashi - Dream Records
Alex - Severed Ties
Gizatsuki - Okami no Yume
Mikan - Braingirl
Althea - The Foxglove Catcher
Aruben - [COLD]

[2023]
Aiko - Illove dream
Kuro - Illove dream
Pale - Remember to Remember
Wormiko - Yume Tsushin
Hikutsuki - Tsukodome
Uwabami - Tsukodome
Zakurotsuki - WeAreDreaming
Aotsuki - Full Moon Dream
Amora - For Elise

[2024]
Minnatsuki - Collective Unconscious
Yasuo - LAPIS lAZULi
Ame - Angel Wings

[2025]
Max - DreamEscape
PJ - pajama
N/A - quilt
Madison - Labyrinth of Paint


(If there is any wrong or miss in the info , please contact me to correct them!)