Yume Nikki

Yume Nikki is the story of a young girl who has very strange dreams. The game is a wide open world, with no main goal besides collecting all the effects.

Effects
There are some sprites for more effects in the game.

Blindfold
There are sprites for an effect that isn't programmed in the game. The 8-bit wake-up pinch are overwritten by some triangle effect.

Of note is that there are two switches most likely related to that effect: Switches 054 and 080 are both the fourth effect-related switches in their groups, and each are never activated. The third item put switch 053 on, which activate Common Event 0008, which turns you into Hat and Scarf Madotsuki, and fourth item put switch 055 on, activatinc common Event 0009, turning you into Yuki Onna Madotsuki. Same pattern applies to swiches 079 and 081/common Events 0033 and 0034.

Crick in the Neck
In the game, this isn't really an effect, it's a random condition that may happen when you get out of your bed. All you can do when you are like that is sit down and go back in the bed. If you go back in the bed, you get out with your head normal. But...



There are 8-bit sprites for it! Which tells us it may have been an effect at some point.

Greyscale
At some point in Hell, there's a ghost of you, always facing the same direction as you. It looks the same as you, but grey. Just an NPC, right?

Nope, this mugshot tells us there was supposed to be a Greyscale effect at some point, or that you would become grey when in the White Desert. The fact that there's no 8-bit version of that effect supports that theory.

Will-o'-the-Wisp


The first of these unused effects had pretty much all it needed to have to be working. The two others were still partially in the game. This effect wasn't so lucky. All that's left is the mugshot, no other sprites at all. Although, the triangle may tell us that this was previously what happened when you used the Triangle Kerchief's ability, as there's no mugshot for when you do.

Unused Areas
Although there aren't much of those, there are indeed a few unused places in the game.

FC World C


This unused right half of the map, dubbed FC World C by fans, is inaccessible by normal means. No events are scripted in the area.

FC World Island?


Map0153 is some kind of island with a few statues. No events are programmed in this map, so you cannot exit.

Debug Room


The Debug Room is accessible through two methods: rename the file, Map0001.lmu to the name of another map, such as Map0003.lmu (Madotsuki's room in the real world), or to set an event that goes to the debug room in RPG Maker 2003.

The various sprites in the room all do different things.
 * The Mirror gives you the Fat effect, but displays garbage text instead of the correct name. The mirror was used in older versions of Yume Nikki for obtaining this effect.
 * The Neon thing makes its regular sound effect.
 * The FC World equivalent to Witch Madotsuki plays the 8-bit version of the effect sound.
 * Hiko-Neko (the cat face) gives you all of the effects and warps you to White Desert B. If you already have the effects, you will get duplicates.
 * Flying 8-bit Witch Madotsuki starts the Witch's Flight event, but you can't move.
 * The chair in the top right corner lets you save, but you won't be able to get out of the chair. Sometimes, the Witch's Flight event plays at the same time.
 * Going directly to the left of the traffic cone warps you to Mars-san, but you are put in a place where you cannot move or wake yourself up.

Madotsuki's Room


This unused cushion is in the tileset of inside Madotsuki's room.



The outside tileset contains a cracked window tile that is totally unused.

Puddle World


Inside the Puddle World's tileset, this torii really, REALLY stands out.

Mars


In the tileset for Mars' underground, there are those tiles for doors, which are, obviously, unused.

FC World


Two types of trees are completely unused.

These tiles look like they could be used in the FC Field area, but are unused.

Lost Party Member
Another Party member can be added to your party, but this never happens in the game.

It's nameless and there are no sprites associated with it. But having it in your party causes several scripts in the game to change.


 * All sane and insane Toriningen disappear. The Toriningen Party and the nice lunatic in The Mall are not removed.
 * The top-left cupboard in the Guillotine Room will disappear. If you stand on it's former tile and press the action button, then you will end up in front of one of the 8 cupboards in Eyeball World. If you enter the world again, then the cupboard will have returned to its rightful spot. This works in the bigger version of the Guillotine Room, too.
 * If you wake up, you will be unable to move. You can still open your menu.