Here is a list of the current effects present in Yume 2kki, as well as their locations and instructions on how to get them.
Please remember that this game is still a work in progress, and because of that the instructions here may become outdated at any time in the future.
Bike (Motorcycle)
(Effect recommended to have before retrieving: none)
Found in Garden World. The effect is located directly southwest from the main entrance.
This effect doubles Urotsuki's speed, allowing for much quicker travel. Also, if one holds down the interact key long enough, Urotsuki will pop a wheelie in place. The name "Motorcycle" comes from Western fans of the game, as the game refers to the effect as "Bike".
Boy
(Effect recommended to have before retrieving: Motorcycle)
Found in Geometry World from the Nexus. From the entrance, go west a few steps, and go up along the row of L-shaped things next to the smiling flower. There will be a door there. Go in, and interact with the thing at the end of the corridor until it doesn't change color anymore. Then exit the corridor, and talk to the outline figure that walks near the door to get this effect.
This effect can be used on some places.If you go to the bathroom on the Dark Room and sit with it you get a wallpaper.Holding down the interact key Urotsuki will sit down and holding again will make her go back.
Chainsaw
(Effect recommended to have before retrieving: none)
Found at the Hospital Outskirts. Go directly south from the entrance, then head due west once you reach the southern wall of the Outskirts. Step on the red circle, then enter the mouth of the vomiting diamond located to the west of the entry point (that is, the red circle that brings you back to the Outskirts) 3 times, looping around from the back to the front to re-enter it. Interact with the chainsaw stuck in the ground in the completely black area to obtain the effect.
This effect allows Urotsuki to kill or injure NPCs (which sometimes leave behind money) and break open certain doorways.
Lantern
(Effect recommended to have before retrieving: none)
Found in Forest World. Travel northwest from the Nexus's entrance until you see a large hole partially blocked off by traffic cones. Enter the hole, travel south at the first intersection near the cave's entrance, and continue south until you reach the southernmost wall. Head east (and south/north as necessary) and you should find the effect at a dead-end.
This effect allows you to lighten dark areas and burn NPCs when the action button is pressed.
Fairy
(Effect recommended to have before retrieving: Invisible)
Found at the Highway. Travel southeast from the entry point of the Highway until you find a small building with a Robot Guard standing next to it. To get past the new version of the Robot Guard, you need to turn invisible so you can walk past him. Bypass the Robot Guard and enter the building, then interact with the fairy to obtain the effect.
This effect can be used to fly over some gaps in terrain and to fly through small holes in walls that would otherwise be inaccesible. In older versions, this effect was located in Pokemon World.
Spacesuit
(Effect recommended to have before retrieving: Motorcycle, Lantern)
Found in Flying Fish World. Navigate through the elevator systems and you'll eventually come across the effect lying on the ground (you'll pass by a boarded-up door on the way; this is Smile-san's room).
This effect allows you to pass over some gaps in terrain, and it is required to enter Space. Holding down the interact key will cause Urotsuki to do a somersault in place.
Glasses
(Effect recommended to have before retrieving: Motorcycle, Lantern)
As of .097f, the Glasses are found in the Dark Museum, which can be reached from a door in Geometry World. You will need the lantern effect to navigate the Dark Musuem.
In older versions, the Glasses are in the Museum (distinct from the Dark Museum), reachable through the ticket booth in Flying Fish World.
This effect reveals some hidden items and modifies the appearance of a few visible objects.
Rainbow
(Effect recommended to have before retrieving: none)
Found in Theatre World. The effect is located directly southeast of the entry point.
This effect illuminates obscured tiles or objects, and can generate a rainbow in some rainy areas.
Wolf
(Effect recommended to have before retrieving: none)
Found near the Teleport Maze from Sign World. Enter the teleporters in the following order: Right, right, up, right, right. Step on the white teleporter to your north to enter an enclosed beach area. Move east until you find a gray-haired NPC; interact with the NPC to obtain the effect.
This effect makes Urotsuki howl, which causes most NPCs to move away from her. Notably, this effect can be equipped on top of the Motorcycle effect for a mixed effect, allowing you to howl while on the motorcycle.
Eyeball Bomb
(Effect recommended to have before retrieving: Fairy or Spacesuit)
Found in Toy World. Go south (the Fairy and Spacesuit effects allow for easier navigation of the slippery floor, if necessary) and pass through the east-facing door in the blue blocks to enter the Mini-Maze. The effect is located deep within the maze (the specific directions are too lengthy to list here), and it is visible on the maze's map.
This effect allows you to return to the Nexus at will, similarly to the Medamaude effect from Yume Nikki. Notably, this effect can be equipped but does not function in underwater areas.
Telephone
(Effect recommended to have before retrieving: none)
Found in the Dark Room. Enter the southern doors in the next two rooms, and you should arrive in a room with a faceless, bat-winged girl. Interact with the moving telephone to obtain the effect.
This effect triggers reactions in some NPCs, and is required to get the Twintail effect.
Maiko
(Effect recommended to have before retrieving: none)
Found in the Shinto Shrine. Go due north from the Hand Hub's entry point and take the main entrance into the shrine. The effect can be obtained from the animated geisha outfit, which is located roughly northeast from the main entrance's entry point.
This effect allows you to take the place of the geisha woman that manages the hotel in Japan Town, and it allows you to view the Odorika event. Holding down the interact key will make Urotsuki bow.
Penguin
(Effect recommended to have before retrieving: none)
Found in Urotsuki's Dream House. Interact with the video game system next to the TV set in your bedroom. Once the game begins, walk along the eastern path (going up and down the ladders as necessary), then hold down the interact key to slide past the looping segment of the path. After that, go onto the next map, climb up the ladder, and face the ledge. The effect will automatically be in the menu the next time you go to sleep.
As described above, holding down the interact key causes Urotsuki to slide and bypass some events. In addition, this effect makes Urotsuki swim if it is equipped in an underwater area.
Bug
(Effects recommended to have before retrieving: Chainsaw)
Found at the Scenic Outlook in the Bug Maze. Equip the Chainsaw effect and attack the creature standing in front of the gray pillar. When it begins chasing you, lead it out of the narrow passage, then enter the now-unblocked passage and interact with the gray pillar. Travel north from the entry point and interact with the gray-and-green object surrounded by fires to obtain the effect.
This effect causes some NPCs to move toward you, similarly to the Cat effect from Yume Nikki.
Spring
(Effect recommended to have before retrieving: none)
Found in the Apartments. From outside the main building, go up the path northwest from it to get to a smaller apartment block. After that, enter the door on the second floor of that building and go down the hole that has tentacles protruding from it. Once inside the long hallway, head east; the area will eventually transition. Keep going east until you see a monochrome creature with a red eye. Interact with the creature, then continue to the east until the area transitions again. Go through the double doors, head east a little further, then go up the stairs at the end of the hallway. Interact with the green-haired NPC to obtain the effect.
Holding down the interact key will make Urotsuki do a small hop. This effect can be used to jump up and reach otherwise inaccesible portions of some areas.
Invisible
(Effects recommended to have before retrieving: Chainsaw, Rainbow or Lantern)
Found in The Invisible Maze from the Bowling Zone. Navigate through the maze and interact with the purple and yellow object. When you arrive at the seashore, go up to the NPC with the hat, equip the Chainsaw effect, and attack her (the area will desaturate). Interact with the purple and yellow object and backtrack through the Invisible Maze. Once you exit the Invisible Maze, you'll appear in Yukata's area. This area is a non-linear maze; follow the direction in which Yukata is facing in each room until the area fades to black, even if you have to backtrack. Eventually you will reach a purple silhouette of Urotsuki; interact with the silhouette to obtain the effect.
This effect allows Urotsuki to become transparent, rendering her unseen by Chasers.
Cripple
(Effect recommended to have before retrieving: none)
Found in Japan Town. Go west into the town from the Sewers entrance, then enter the alleyway located after the entrance to the hotel. Go directly east down the alleyway until the area transitions to enter a strange location with moving ladders. Once there, head north until you see Heishi-kun sitting in a circle of light from a streetlamp. Interact with him to obtain the effect.
Holding down the interact key makes Urotsuki say her "I can't do that" lines.
Stretch/Tall
(Effect recommended to have before retrieving: none)
Found near the Hospital. Head west through the reception room of the Hospital, go through the opening on the west wall, pass through two segments of the hallway (you'll go by 6 doors), then enter the first door in the 3 hallway segment (door #7). Interact with the yellow, cycloptic snake wearing a boot to enter a monochrome maze of arrows. Navigate through the maze until you reach the blue creature at the northern wall of the maze, then interact with the creature to enter a odd room with a animated picture and a hanging girl. Go south from the entry point, turn east at the dark spot in the red line, continue east until you hit the wall, turn north and turn west down the green and red path next to the hanging girl, then pass through the rounded door frame at the end of the path to enter a large, laggy room filled with spinning glyphs and crystals. Interact with the small blue crystal at the southeast corner of the map, head northeast along the screen-sized blue map, and interact with the pink and red object to obtain the effect.
This effect doubles Urotsuki's height and halves her width, and pressing the action button makes her kneel down and cry. It is required (in addition to some money) to enter The Baddies Bar.
Haniwa (Gyroid)
(Effect recommended to have before retrieving: none)
Found in the Haniwa Temple from Sign World. Travel east along the path (interact with the haniwas on the path to clear the way) and go up the staircase until the map transitions. Continue east to the top of the stairwell; you'll be in Haniwa Temple once you reach the end of the staircase. Interact with the gray haniwa to obtain the effect.
This effect allows Urotsuki to move haniwa statues when the interact key is held down.
Cake
(Effect recommended to have before retrieving: none)
Found in Cutlery World. Travel south until you reach the fence, hug the wall and travel west, then go south through the closest opening in the fence. Repeat these steps with the second fence. Once you reach the third layer, head east until you find a silver fork; interact with the fork, then travel west across the path and up the neck of the giant fork. Interact with the cake-headed girl in the yellow dress to obtain the effect.
Holding down the interact key makes the cake on Urotsuki's head drip frosting, which she wipes away.
Twintail
(Effects recommended to have before retrieving: Chainsaw, Telephone)
Found in The Deciding Street. Go through the entrance underneath the red cover. Walk to the western end of the room, equip the Chainsaw effect, and attack the telephone. Then, equip the Telephone effect and stand on the gold-and-black tile where the telephone was sitting. After a while, the pink figure will walk over and "answer" Urotsuki, prompting a short cutscene in which you obtain the effect.
Pressing the action button makes Urotsuki kick in whatever direction you are facing. It can also be combined with one of the costumes in the Dressing Room. Some of the sprites in the sprite sheet appear to indicate that you may be able to punch with your pigtails in future releases of the game.
Child
(Effect recommended to have before retrieving: none)
Found on the Ocean Floor. When the Submarine arrives here from the Docks, exit the submarine, then traverse the area, keeping generally as close to the southern edge of the maps as you can (you should pass by various oversized object on the way). Once you find a northern path that leads to an open area with a bed in the center, take the western path and interact with the large egg-shaped object; this will bring you to a small room with a bed and a familiarly-patterned egg. Interact with this egg to obtain the effect.
This effect is cosmetic, shrinking down all of Urotsuki's proportions by a factor of 2. Holding down the interact key will make Urotsuki jump up and hit her head on an unseen object.
School Boy
(Effect recommended to have before retrieving: none)
Found in Monochrome Feudal Japan. Go southwest from the Art Gallery's entry point until you reach a sort of dirt barrier, then go west alongside the dirt wall until it diverges to the southwest. Continue to follow along the wall to the southwest, then head east when the wall cuts to the east. Move through the opening in the southern wall when it comes up, then go roughly west-southwest until you encounter a fence with a substantial gap in it. Pass through it and continue south-southwest through the scattering of buildings. One of the open buildings leads to the area with the effect; the correct building will leads to a brief dark hallway between two brightly lit doorways. Go west through the hallway, then follow along the path until you encounter a blue-skinned NPC in dark clothing. Interact with him to obtain the effect.
This effect is cosmetic, and holding down the interact key will make Urotsuki flap her cape.
Trombone
(Effect recommended to have before retrieving: Lantern)
Found in The Baddies Bar. Once there, equip the Lantern effect and flourish the lamp; this opens all of the rooms that might possible contain the effect. Look around the area and enter all of the narrow black openings in the walls to look for the effect (be careful; most of these chambers contain Chasers). Interact with the multicolored flashing humanoid holding the trombone in one of the rooms to obtain the effect.
This effect allows Urotsuki to play in a duet with Elvis Masada. Holding down the interact key makes Urotsuki play a few notes on the instument.
Tissue
(Effect recommended to have before retrieving: Motorcycle)
Found in White Fern World. Follow the path from the White Mushroom Field (ignore the branch-off to the east near the beginning) until you reach a large area shaped like an eyeball (NOTE: This path is extremely long. Usage of the Motorcycle effect is recommended). Once there, step inside of the middle square in the array of squares to the west of the entrance to enter the deepest section of this world. Travel approximately southeast until you encounter a cylindrical building. Enter the building, wait for the cutscene to finish, and interact with the white papery object sticking out of the building to obtain the effect.
This effect allows you to leave up to 5 markers (i.e., tissues) on the ground (hold down the interact key to do so), similarly to the Poop Hair effect from Yume Nikki.
Little Red Riding Hood
（Effect recommended to have before retrieving: none)
Found in the Fairy Tale Woods from the UFO entrance. Head south through the rooms until you reach a large tree with a single red apple on it. Interact with the base of the tree to obtain the effect.
When pushing the action button, Urotsuki will take what looks like food out of her basket and eat it.
Polygon
(Effect recommended to have before retrieving: none)
Found in the Warehouse. Travel east-northeast of the Red Nail Passage's entry point until you encounter a large building with an open doorway. Go through the doorway, then continue east through the front room and across the hallway, then take the ascending staircase. In the next room, take the other ascending staircase. On the top floor, go to the west down the hallway, then enter the northern door about midway down the hall. Interact with the moving polygon to obtain the effect. Somehow, you can change this and create a hole in Urotsuki's head.
This effect is cosmetic, and holding down the interact key will make a green outline temporarily surround Urotsuki and make her model change from low-definition to high-definition (and vice versa if repeated).
Marginal
(Effect recommended to have before retrieving: none)
Can be found in the Broken Faces Area. Locate the UFO building, then travel southwest until you see Marginal Vivid Worker (sometimes called Strangler Eyes). Interact with him to obtain the effect.
This cosmetic effect transforms you into a Marginal Vivid Worker, which is also a meme on Pixiv.
Teru Teru Bōzu
(Effect recommended to have before retrieving: none)
Can be found at the end of the Dark Stairs Zone in the Dark Alleys.
This effect turns Urotsuki into a Teru teru bōzu. Holding down the interact key will make it rain, and doing it a second time time will stop the rain.
Bat
(Effect recommended to have before retrieving: Teru Teru Bōzu and Rainbow, or Invisible)
Can be found in the area across the river of the Tribe Settlement. This place can be accesed using two methods. One is from the FC Basement (takes more time, requires Invisible effect). Starting from the normal entrance from the Tribe Setlement, go down the stairs, then go left and down the stairs, go left a bit, chainsaw the white creature and take the stairs going down right behind him, take the stairs going down again, go to the right, equip and use the Invisible effect, and go up the stairs in front of the wall with eyes, and finaly go up the stairs again. In the separated area of the Tribe Settlement, just go up and interact with the creature in front of the totem to get the effect.
There's a shorter method, but it requires the Teru Teru Bōzu and Rainbow effects. In the Tribe Settlement, go to the river zone and use the Teru Teru Bōzu effect to make it rain. Then use the Rainbow effect, and a multicolored path will appear, conecting both sides of the river.
This effect gives Urotsuki bat wings. Holding down the interact key once will mark the spot you're standing in, and doing it a second time will make Urotsuki fly out of the map, and then appear at the spot you previously marked. It can be used to fly over the girl blocking your way at the Snowy Pipe Organ as well. It can also be used to fly over roadblocks/traffic cones and access areas that are under construction. This is obviously an unintended behavior, and some map designers scripted their maps to disallow the use of this effect. This glitch has been fixed as of version 0.097f. In versions earlier than that, the glitch is simple to execute. Just tap the arrow keys while the screen is fading after flying into the air to move over terrain.
Pseudo Effects
This is a list of the effects that either cannot be collected, combinations of effects or are still in development.
Uncollectable
Dressing Room
Whenever you interact with the manequins with outfits on in the Dressing Room, your outfit changes. You can also wear the Glasses effect with the suit and the Twintails effect with the maid outfit.
Swimsuit
If you go to the hot springs from the Mini Maze in Toy World, Urotsuki's outfit changes into a blue swimsuit with a light blue swim cap.
Santa Claus
In Christmas World (accessible from the Hand Hub), go into the large house and chainsaw the man wearing a Christmas hat. Interact with the hat and your outfit changes to a Santa Claus costume.
Sliced
In Urotsuki's Fake Apartments, go into the room on the lowest floor with the girl with long green hair in it. If you walk up to the side of one of the razors and press Z, Urotsuki will walk through the razor and split in half. This effect only lasts for as long as you are in the room.
Shadow Monster
When you are in the hotel in Japan Town, you may find a room where you can put on your swimsuit and get in the bath. After a while, Urotsuki may suddenly change into this form, and after walking out into the main lobby, she will be surrounded by shadow people, change back to normal and return to the bathroom. This form also makes Urotsuki walk a lot slower.
Combo Effects
Wolf/Motorcycle
One of two combo effects currently programmed in the game. By selecting the Wolf effect and then the Motorcycle, you are able to ride the motorcycle as a wolf.
School Boy/Glasses
There are currently only two sprites of this effect available on the sprite sheets. This combination is a reference the series Pop'n Music; particulary the character Nakaji, whom wears the same mask.
Twintail/Glasses
Another combo effect, added as of .98. Selecting the Twintails and Glasses effects makes Urotsuki wear glasses with her twintails. Holding Z makes her cross her arms.
Bug/Rainbow, Chainsaw,???
These Bug combos are available in the Debug Mode of the game. Using Rainbow with Bug makes you into a rainbow-colored bug, using (possibly) Chainsaw and Bug makes you a bee, and using Bug with an unknown effect makes you a green beetle.
School Boy/Chainsaw(?)
Only available on the School Boy sprite sheet. It is Urotsuki using the School Boy effect with some kind of sword.
School Boy/Bike
Only available on a sprite sheet currently. It's basically Urotsuki with the School Boy effect riding the bike.
Twintail/Wolf
Only available on the sprite sheets. This combination's purpose is unknown.
Wolf/Glasses
Only available on the sprite sheets. This combination's purpose is unknown.
In Development
Block Person
This can transform you into a walking block from Toy World included in past versions of the game. You are able to get this from the E tile somewhere in Toy World, but its abilities are unknown.
Odorika
This effect makes you look like Odorika, and seems to be only cosmetic. This is currently only available on a sprite sheet.
Faceless
This removes Urotsuki's face and puts an eye on her shirt. This is debatable as to whether this could be an effect in the future, as it currently only appears in the Mirror Room in Toy World when you use the Glasses effect on your reflection.