History VideoGame / Yume2kki

** Snowy Forest can only be explored for two minutes maximum before day breaks and Urotsuki wakes up.

** Drowsy Forest takes it to the next level with its ''40-second'' time limit. If you fail to find the exit in time, Urotsuki wakes up in a strange version of her own bedroom.

* AmbiguousGenderIdentity: Urotsuki's Dream Apartments has a blue boy in one of the rooms. If you use the Invisibility effect, the boy looks around and then transforms into a girl with orange hair. If you use the Glasses effect, the kid turns into the girl and runs away in fright. It's possible that the blue kid is a transgender girl and is hiding it from Urotsuki.

** There's an area in the FC Caverns that has a very ''VideoGame/{{VVVVVV}}''-esque character inside of it.

** Monster Clown Snake Women.

* UnlockableContent: Various wallpapers for Urotsuki's computer as she gets to certain points/activates certain events, among other things.

* EasterEgg: Holding right and shift while starting a new game unlocks Time Trial Mode, a {{speedrun}} mode where you try to beat the game as fast as possible. Saving is disabled while in this mode.

** There's a chance that if you turn on the TV in Urotsuki's fake room, you will be greeted by basically [[VillainTeamUp all the chasers in the game]] with no place to escape. [[spoiler: Though there's always the Medabomb Effect to handle that.]]

** The Forest of Sleepiness takes it to the next level with its ''40-second'' time limit. If you fail to find the exit in time, Urotsuki wakes up in a strange version of her own bedroom.

The game can be found [[http://dic.nicovideo.jp/a/%E3%82%86%E3%82%81%E3%81%AB%E3%81%A3%E3%81%8D%E6%B4%BE%E7%94%9F here]] and updates very frequently.

** Killing Megusuriuri will cause the EldritchAbomination in one of his cabinets to fester and mutate his office and Box-chan. After seeing this, you can never enter the office or see [[{{Moe}} Box-chan]] again. [[spoiler:

* DependingOnTheArtist: The Wallpapers are all made by different artists, so everyone has a different interpretation of all of the characters.

** Wallpapers. There are 427 in total, each one of them with their own unlock method.

* WideOpenSandbox: Apart from [[GottaCatchEmAll finding all 36 Effects]], there is no explicit goal.

** The wallpapers are this, serving no purpose other than to give you something different to look at when you're accessing the menu.

** Wallpapers. There are 314 in total, each one of them with their own unlock method.

* GardenOfEvil: In one of the more isolated areas of the game, you will come across this along with a [[DeadGuyOnDisplay Dead Girl On Display]] and a [[WhenTreesAttack Laughing Tree]].

* SpiritualSuccessor: Besides the obvious fact that the game is a spiritual fangame to Yume Nikki, one very large mass of areas created by a certain developer almost seems like a more linear (but graphically improved) successor to [[VideoGame/LcdDem his own game]].
* SpookySilentLibrary: One of the worlds accessible from the Nexus.

** Voxel Island, one of the deepest locations in the game, has some bizarre conditions to getting to it, one depending on ''Nexus color'', the other condition being [[Catch22Dilemma not having the Drum effect with you despite needing the Drum effect to get to the Silhouette Complex.]]

* DevelopersRoom: You may gain access to a developer room by [[spoiler:unlocking the first four endings, which will cause a present to appear in the real world with a key to the room]]. Inside it, you may change the music that plays inside, change your walking speed, meet [[AuthorAvatar Author Avatars]] that represent some developers, and even play a slot machine game.

* EarlyInstallmentWeirdness: In very early versions of the game, you played as a boy in a grey hoodie in a room much different to Urotsuki's, and the dream worlds were much smaller and of lesser quantities. When Urotsuki was finally introduced as the protagonist, the worlds were still sparse, and it took a while for more of them to appear. Theater World also was accessible from the Nexus until it was replaced with the Matoran Keyboard.

** Voxel Island, one of the deepest locations in the game, has some bizarre conditions to getting to it, one depending on ''Nexus color'', the other condition being not having the Drum effect with you despite needing the Drum effect to get to the Silhouette Complex.

* [[HalfTheManHeUsedToBe Half The Girl She Used To Be]]: Can happen to Urotsuki in a room in her dream apartments. Played entirely for humor, as she can still walk around and there's no blood or gore associated with it.

* JungleJapes: The Tropical Jungle, located behind the Grand Scientific Museum, contains lush, colorful foliage, towering trees, and even what looks like a [[EverythingsBetterWithDinosaurs dinosaur]] with a spiral neck.

* SequelEscalation: While not a "true" sequel per se, Yume 2kki takes all of the content in ''VideoGame/YumeNikki'' and amplifies it [[UpToEleven to the max.]]

* SurrealHorror: With all of the content in the game, Yume 2kki takes the amount of Surreal Horror present in ''VideoGame/YumeNikki'' UpToEleven.