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Please remember that this game is still a work in progress, and because of that the instructions here may become outdated at any time in the future.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)
From The Nexus, enter Garden World. The effect is located directly southwest from the 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".
BoyFile:Effect boy.png
(Effect recommended to have before retrieving: Motorcycle)
From The Nexus, enter Geometry World. Travel directly north from the entrance, then turn to the west once you pass a C-shaped line on the ground to your left. Continue traveling west until you see a door in a opaque teal block (if you loop and don't see it, move two or three steps north, then continue to the west), and enter the doorway. Head east down the teal path and enter the door on the teal object at the end of the path. Once you emerge in a yellow-and-black room with a maze, go to the southern end of the boxed-off area that you're in and enter the maze (make sure to avoid the patrolling ghost). Transverse the maze until you encounter a yellow-framed doorway, then enter the door and travel north along the path until you pass through a second doorway. Move through the second section of the maze until you encounter yet another doorway (there should be a number of white ghosts in an enclosed area within sight of this door). Go into this door, then interact with the blue object at the far end of the room until it makes a different sound. Exit the room, then interact with the rainbow-flashing outline of a human to obtain the effect.
Chainsaw 
(Effect recommended to have before retrieving: none)
From The Nexus, enter Graveyard World. Travel roughly east-northeast until you find a vomiting heart, then pass through its open mouth and enter the door on the western wall in the room in which you appear. Travel west through the Hospital's reception room and go through the opening on the western wall. Pass through 3 segments of the hallway (you'll go by 9 doors), then enter the first door in the 4th hallway segment and go through the opening on the western wall in the small room through the door. Continue west through the oddly-floored hallway and pass through the entryway into 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.
Lantern 
(Effect recommended to have before retrieving: none)
From The Nexus, enter Forest World. Travel northwest from the entry point 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.
Fairy 
(Effect recommended to have before retrieving: none)
From The Nexus, enter Onyx Tile World. Move along the eastern path until it opens up, then head northward, going to the west at the intersection you should encounter. Continue north until the pink, worm-like object comes into view, at which point begin moving east-northeast until you find a taxi. Interact with the taxi to warp to 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. 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)
From The Nexus, enter Geometry World. Travel west-southwest until you encounter a square block with a door set into it (it should be next to a row of other doorless blocks). Go through the door to enter the Dark Museum. Travel north and go through the northern door, then walk west down the hallway and enter through the door on the northern wall at the end of the hallway. Go north until the room opens up, then walk west until you see a cartoony mailbox. Interact with the mailbox to enter 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)
From The Nexus, enter Geometry World. Travel west-southwest until you encounter a square block with a door set into it (a row of smaller blocks should be directly to the right of this block). Go through this doorway to enter the Dark Museum. Move north and go through the northern door, then go west down the hallway and pass through the northern door at the end of the hallway. Head north until the room opens up, then interact with the cartoony mailbox located west of the door you just exited to enter Flying Fish World. Ignore the elevator entrance and instead travel west and interact with the identical cartoonish mailbox to teleport to the Museum (distinct from the Dark Museum). Go through the eastern door and interact with the moving glasses on the pedastal to obtain the effect.
This effect reveals some hidden items and modifies the appearance of a few visible object.
Rainbow 
(Effect recommended to have before retrieving: none)
From The Nexus, enter 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)
From The Nexus, enter Mushroom World. Go west from the entry point until you find a white pavement trail, then follow the trail in a northwesterly direction until you find a green teleporter. Interact with the teleporter to go to the Bug Maze. Travel west along the path until you are forced to turn north, then take the northeastern path at the intersection. Follow the path until the next intersection, then go north at the intersection and follow the trail pointed to by the yellow arrow. Interact with the monochrome sign at the end of the trail to enter Sign World. Travel directly south from the entry point until you run into a sign, then go east until you encounter a heart. Head north from the heart and interact with the blue and white signpost to enter the Teleport Maze. 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)
From The Nexus, enter 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)
From The Nexus, enter Marijuana Goddess World. Travel south and east across the body of the goddess until you reach the bottom row of tiles on the shape, then head due east until you find a pink doorway shaped similarly to a cat's mouth. Go through the doorway to enter 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)
From The Nexus, enter Mushroom World. Go west until you encounter a white pavement path, then follow the pavement path in a northwesterly direction until you find a green teleporter. Interact with the teleporter to enter the Bug Maze. From the entry point, go west along the path until you are forced to go north, then take the northeastern trail at the intersection. Follow the path until the next intersection, go north at that intersection, and head west at the next intersection. Take the southern branch off of the western trail and walk between the two humanoid figures to enter The Hand Hub. Travel southeast from the entry point (ignore the other portal that's visible from the entry point) then take the closest northeast path. Interact with the portal at the end of this path to go to 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)
From The Nexus, enter Urotsuki's Dream House. Interact with the video game system next to the TV set. 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)
From The Nexus, enter Mushroom World. From there, go west until you encounter a white pavement path, then follow the path in a northwesterly direction until you find a green teleporter. Interact with the teleporter to enter the Bug Maze. Move along the west path, go north at the first intersection, and interact with the giant flower to enter the Scenic Outlook. 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)
From The Nexus, enter Mushroom World. Travel west-southwest along the white pavement path, then take the northern path into a roughly elliptical area of mushrooms when you encounter an intersection (the southern path leads to a square of pavement with a broken vending machine next to a faceless man). Take the western path at the intersection inside of the ellipse, follow along the red cracks in the ground, and interact with the stemless mushroom cap with eyeballs. Then, pass through the eyeballs on stalks to enter the White Mushroom Field. Travel roughly southwest until you find a less saturated version of the stemless mushroom cap with eyeballs; interact with it to enter White Fern World. From the entry point, travel south along the path, take the eastern branch-off, and step on the black void to enter the Apartments. Head north past the faceless boy to reach the buildings, then enter the door on the second floor. Go up through the northern door, then go south and exit the room. From there, go west and get off of the porch of the building, then go through the transition point to the west of the building. 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)
From The Nexus, enter Forest World. Travel due east of the entry point until your path is blocked by a line of trees, then interact with the white chocolate bar to enter Chocolate World. From there, travel south until you reach a four-way intersection, then go west at the intersection. Interact with the blinking, pink-and-purple, conical object to enter the Stone Maze. Head east until you encounter a dead end, then go north. At the first intersection, move east, then turn south at the subsequent intersection. Continue south until you encounter a red bowling ball; interact with it to enter the Bowling Zone. Go north from the entry point in the Lanes and interact with the three white pins at the top of the alley (make sure to avoid the purple bowling balls) to enter Bowling Pin World. Go northeast until you see a triangle of black dots surrounded by four pins, then step on the triangle of dots to return to the Lanes. Go north (ignore the opening to the other lane) until the map stops, weaving through the stationary obstacles as necessary, to reach The Invisible Maze. Navigate through the maze (you can equip the Rainbow effect and hold down the interact key to temporarily reveal the maze walls) 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 (it'll be visible this time). 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. After the area transitions, you'll appear on a glass platform above deep space. Follow the path of glass tiles until you 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)
From The Nexus, enter Marijuana Goddess World. Travel south and east along the goddess's body, then, once you reach the southernmost line of tiles, go due east until you find a cat's-mouth-shaped doorway set in a pink frame; pass through this doorway to enter the Dark Room. Head one room south from the entrance, take the doorway on the eastern wall, go up the stairway, then pass through the other doorway to enter the Sewers. Move along the path to the east, then head down the southern stairwell. Go west for the next two rooms, then use the ladder in the third room at the end of the path to enter Japan Town. Continue west into the town, 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)
From The Nexus, enter Graveyard World. Travel east-northeast until you find a vomiting heart, go through the heart's open mouth, then go through the door on the western wall of the room you're now in to enter the Hospital. Head west through the reception room, 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 it is required (in addition to some money) to enter The Baddies Bar.
Haniwa (Gyroid)
(Effect recommended to have before retrieving: Motorcycle)
Found somewhat deep into the Marijuana Goddess world. Go there, then down until the hand thing, and once there touch the top left hand thing to be warped to the Bug Maze. Go to the right and into the "secret" passage (which is obvious because of the arrow pointing to it), and navigate on the invisible paths until you find a sign, which leads to the Sign World. Find something that looks like some sort of blocky pyramid and go to the middle of it - this will cause the jumping character to disappear, as well as change the entire sign world. Go right from the pyramid until you see a set of rocks, and once in that thing that looks like Stonehenge, just go right until you reach the upper area (simply interact with the obstacles to make them disappear) and interact with the Gyroid at the top of the screen to get this effect, which makes you able to move Gyroids around when you hold Z (including the one that gave you the effect).
Cake
(Effect recommended to have before retrieving: none)
Go to Theatre World. Move down about 6 steps directly below the entrance and then head right to find an arch-way. Enter the archway. From the entrance, hug the bottom of the gate and go left. Then down though the doorway. Then go left on the bottom until you see an opening, go through it.Stay in the middle of this gated area and go left until you find a silver fork. Interact with it and keep on going left. When on top up the fork, talk to the girl to get the effect. The cake effect drips when you hold Z. Simply cosmetic, but the girl in the world you got to the effect from will react strongly to you having this effect equipped.
Twintail
(Effects recommended to have before retrieving: Chainsaw, Telephone)
Go to the heart world. Enter the shoes. Go left under the red and white cover. Kill the teleohone in the room. Equip the telephone and stand in the spot where the telephone was. Wait a few seconds. The pink person should answer you. The screen will go black. After a few seconds, you will recieve the twintails effect.
In the 0.092i version of the game, talking to the Mirror Room ghost in the chess pattern floored house with the Twintails equipped will get you teleported into a similar-patterned hallway. The end of it will have the mirror with the ghost trapped in it. Breaking the mirror will cause the ghost to disappear. Otherwise the effect seems to be just cosmetic. Although, some character sprites indicate that Urotsuki may be able to use the twin tails as arms with the abililty to punch in the future.
Child
(Effect recommended to have before retrieving:motorcycle)
Go to the apartments from the library. Go down the stairs and to the upper left on the map once you are outside the bunny man's apartment. Go in the apartment directly in front you. Go in the portal. Follow this map to get to the submarine. The submarine will only be open 1/8 times you are there (if it's not, just walk on the tiles close to the nearest junction on the path, marked by little dots on the map near the submarine). Once in the submarine, wait about 5 minutes until the sonar sound starts sounding different and the background moves more slowly (you can interact with the girl to make the submarine invisible, which makes identifying that easier), then exit the submarine. You should now be at the bottom of the sea. Keep going down to the bottom of each map. They usually have only 1 or 2 exits in each, so it should not be hard getting to the end. The end is near a bed. When you find the bed, go left and interact with the white egg. You will be transported to a room with an egg in it. Interact with the egg to get the effect.
The child effect turns Urotsuki to about half her size. When you press z she jumps.
School Boy
(Effect recommended to have before retrieving: motorcycle)
Can be found through a painting in the art gallery. There are two ways to get there. The first is to follow the route to the room where you got the telephone effect. If the girl is reading, you can use the telephone effect to make her leave. Interact with her book to be transported to the art gallery. The second is to go to the Marijuana world. Go down and interact with the blue neon hand. Once you are in the giant neon hand, you will want to go all the way to the bottom. Interact with the blue hand there. You should be in a forest. From there, you will go to your left until you see an easel. Enter that. When you're in the art gallery, go to the 5th painting on the first floor. Enter the painting. From the entrance, go up until you touch the fence. Then go right. Keep going right until the fence starts to go up. Go up with it. Go up through the area. Once you exit that area, go right and up. You should see a town. Go in the first opening and go down. go in the next opening. You see open and closed houses (some of them just lead to an island). Go all the way to the bottom. Enter the house on the bottom left. You'll be in a dark cave and keep on going left until you reach a new area. Follow the path until you see a blue guy and interact with him to get the school boy effect. Hold Z to flap your cape.
Alternate way: from the entrance of the monochrome world, go down until you touch the fence, then right until you touch the fence again. Go down until you can go right again, and then do that until you pass through a gate. There's only one way until the lot of houses, so it shouldn't be too hard to figure your way there. Once you do, go as far down as you can, then as far left as possible. Find the open house closest to where you are, then in this small world find the student.
Trombone 
(Effect recommended to have before retrieving: Lantern)
Follow instructions for the Red Riding Hood effect until it mentions the three bleeding faces. "Make sure you are left to the farthest left face and then go down".The small green man should be walking around near the top area of the UFO door. Talk to him to be transported to a world with multicolored walls that have zippers in them. Wander around until you find a zipper that touches the floor. Use the lantern to open it. You should see a multicolored man holding a trombone. If you see a face with sharp teeth exit the room and locate another zipper in the area. ( The lantern opens all of the big zippers in this world) The man will be in one of the zippers.
The trombone will play a tune when you press z. It also causes the creatures with trumpets on them to change colors and slow down. You can also play a duet with Elvis Masada if you talk to him while it is equipped.
Tissue 
(Effect recommended to have before retrieving: Motorcycle)
Head to the Mushroom world. From the entrance go left until you hit a wall of white and red mushrooms. Go down around the mushrooms and look for an opening in the mushroom fence. Go up and to the area with the red cracks. Find a white blob with red eyes and interact with it. Next, go in between the pair of eyes. From there take the red path down. When it branches go left and continue to follow the path. You will come across a large group of mushrooms. Just go along the bottom and take the first path that goes down. Follow it and you should come across a white face surrounded by 5 mushrooms. Interact with it. You will be transported to a world filled with snow. Go down. Ignore the door to the right and keep going down. Get through the area( it is pretty straight foward so it should not be hard.) Once you exit that area, go left and enter the center of the +. Go right from the entrance. When you encounter a green bubble creature go up. You should see a tower. Enter it and wait for your character to get to the top. When you reach the top, interact with the blue box to get the tissues.
The tissue turns Urotsuki's head into a tissue box. She can drop tissues that can be used as markers.
Little Red Riding Hood 
(Effect recommended to have before retrieving: Motorcycle)
Go to Christmas World and interact with the smallest tree. Locate the manequin walking around in the Exibition and talk to him. In the nails area, locate the hexagonally shaped door. Enter it and go all the way to the end of the area. In the window room, make sure that the things in the window are bears. Once you are in the bear area, locate the telephone pole and interact with it. In the red and black area, find the black tube with the red eye and interact with it. From there, go left until you see 3 bleeding faces. Make sure you are left to the farthest left face and then go down. You should see a door with a space ship on it. Enter it and you will find yourself in a grey room with an odd creature and a UFO. If the UFO is not there, just exit the room and re enter it. Keep doing that until the UFO shows up. Enter the UFO. Go to the left door and enter it. Intaract with the computer on the left and select the apple option. You will hear a beeping sound. In the far right room in the UFO a clock will be counting down how long until you reach your destination. Once the clock hits zero, exit the UFO and go all the way down until you see a tree. Interact with the tree to get the effect.
The Red Riding Hood is simply cosmetic. It dresses Urotsuki up like the story book character Red Riding Hood.
Polygon 
(Effect recommended to have before retrieving: Motorcycle)
Go to the Grey Road from Red Streetlight World and cycle around the black areas. You should find a staircase leading underground. Go down it and keep traveling right until you come to a grassy area. Now go right until you come to a group of streetlights in a circle. Cycle upwards and interact with the small four-leafed shoot coming out of the ground. You'll be transported to the Warehouse.
Continue traveling right again through the area until you come to a white doorway on your left. When you enter it, you will be transported to a pinkish rooftop with a rotating triangle. Interact with it to get the Polygon effect.
The effect makes Urotsuki look like she is made of blocks, and if you press Z, a green outline will appear around her and her texture will become more detailed.
Pseudo Effects
This is a list of the effects that either cannot be collected, combinations of effects or are still in development.
Outfits
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.
Combo Effects
Wolf/Motorcycle 
This is the only combo effect 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 File:Policemask.png
There are currently only two sprites of this effect available on the sprite sheets, but it looks like you have a sheet of paper in front of your face with a drawing of glasses and a mustache on it (a disguise?).
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/Bike
Only available on a sprite sheet currently. It's basically Urotsuki with the School Boy effect riding the bike.
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.
Bat
This effect gives Urotsuki bat wings. This is also obtainable from the E tile in Toy World, yet it is only cosmetic for the time being.
Odorika 
This effect makes you look like Odorika, and seems to be only cosmetic. This is currently only available on a sprite sheet.