GOCCO (ＧＯＣＣＯ)/guide

Walkthrough
This is a partial walkthrough on where to find effects and how to get items and achievements. Whilst some of the content has been translated from Yume Nikki Derivation Enjoyment @wiki, the rest is based on actual playing experience.

If you played the game and found more Effects/Items/Achievements, please add them to the walkthrough. Thanks!

Fire Iron (ひかきぼう)
Reality → Manhole World → Blue-Green Swamp → Yellow Fish Passage → Passage to Guitar-san's Place → Chinatown → Red Maze → Gray Town → Talk to the white shadow girl

Crown (おうかん)
Reality → Manhole World → Blue-Green Swamp → Purple Passage → Castle → Talk to the Eyeball King

Pointed Hat (とんがりぼうし)
Reality → World of Broken Glass → Rainy Ruins → Ghost Castle → Talk to the old man in the Ghost Castle

Vacuum Cleaner (そうじき)
Reality → Graffiti world → Hospital → Painting Passage → Head family numbers World → Harbor in the evening → Curtain World → Warehouse Passage → Torso World → Dark Window Passage → Green Men Garden → White Ruins

Wire (はりがね)
Reality → Manhole World → Lower part of Manhole World → Stone Humanoids World → Place the ball (at the north-eastern side of the map) in a hole (at the south-western side of the map), dive into the hole after the ball, then talk to the creature in the small room.

Ice (こおり)
Reality → Manhole World → Purple and Green Mountains World → Talk to the woman in the glass passage

Headset (ヘッドセット)
Reality → Manhole World → Lower part of Manhole World → Yellow Tiles World → Waterside Town → Talk to the singer who is on the stage at the concert

Dot (ドット)
Reality → Manhole World → Blue Swamp → Yellow Fish Passage → Passage to Guitar-san's Place → Chinatown → Red Maze → Dark Town → Office → Talk to the resident of the round building with lots of ladders on it

Mosaic (モザイク)
Reality → World of Broken Glass → Rainy Ruins → Ghost Castle (2nd floor) → Black-and-White World → Subway Station → Train (to a station in the city) → Station in the city → Train (to a station in the countryside - red sign) → Station in the countryside → Countryside → Sunflower Passage → Eyes and Chasers Hallways → Red Flashing Room → Talk to the black circle in the back of the room

Female Doctor (じょい)
Reality → Graffiti World → Colorful Plates World → Connecting passage → Dark Bridge World → Connecting passage → Red tree painting World → Flower Tiles World → A black field with a Gyudon Shop → Talk to the residents of the cross type in the Character World.

Rope (なわ)
Reality → Manhole World → Lower part of Manhole World → Stone Humanoids World → Savannah → Bubble World → Mr.HEL's Live Concert → Huge Face Passage → Passage with a string in the back → Talk to the doctor in the world of darkness

Apron (エプロン)
Reality → Manhole World → Blue-Green Swamp → Yellow Fish Passage → Guitar-san's Place → Dark Neon Shapes World → Dark/Red Hallways → Purple Bugs Neighborhood → Interact with the black cat in one of the alleys between the houses.

OR:

Reality → (Pond →) Green and Black World → (Red and Blue Balcony →) Blue Eyeballs Gallery → Childishly Drawn World → (Cage Hallway) → Guitar-san's Place → Dark Neon Shapes World → Dark/Red Hallways → Purple Bugs Neighborhood → Interact with the black cat in one of the alleys between the houses.

Consumable Items
These items are consumable, which means their amount decreases each time you use them. When you are out of the item, it will disappear from your list until you pick it up again. These items can be collected to an unlimited amount.

Unlimited Use Items
Once picking them up, they can be used an endless amount of times.

Clothes/Accessories
Although clothes are collectable in GOCCO, (almost) none of them actually show up on the sprite when equipped. All of these items are there to add up "defense", "attack", "mental" etc. points to Sanagi. Since it's not a real RPG, only some of those qualities actually make any difference during the game.

Window/Menu Types
To equip

Achievements
Here are the game's achievements and how to get them.