Like Yume Nikki and many of its fangames, there are a variety of events that Soutarou can come across in Mikan Muzou. This article contains a list of many of the events found throughout the game, along with their individual locations, their requirements to activate, and what consequences activating them may have.
Bored
Location: Soutarou's Real Room.
Effect Needed: None.
Required Sanity: Any.
Description: In the real room, if you wait a little, Soutarou will yawn. Every time Soutarou yawns, his level of sanity will randomly increase/decrease by 1 point.
Waking Up
Location: Various locations.
Effect Needed: Any/None.
Required Sanity: Any.
Description: Most of the effects have a unique waking up action. For example, if you have the Tape effect equipped, Soutarou looks like he is being taped until he disappears; if he's in the child state of the Down Jacket effect, he'll fall on his knees; or if he uses the Torso effect, he will disappear and leave behind a blood puddle.
What's also interesting is that the only time Soutarou will pinch his cheek like any other dreamer is when he has the Black Hair effect equipped.
Trying to wake up when he's already awake will result in him looking up - probably at the player - confused.
Nature of Chasers
Location: Various locations.
Effect Needed: Brass Knuckles.
Required Sanity: Any.
Description: In this game, Shokushu as chasers work differently than in other fan games. If Soutarou attacks a calm Shokushu while wearing a bag on his head with the Brass Knuckles effect, it will be killed. However, if Soutarou does the same action without the bag on his head, the chaser will become enraged. If Soutarou is caught while they are in this state, he will be transported to an inescapable area.
Hazy Memory
Location: Soutarou's Dream Room.
Effect Needed: None.
Required Sanity: Any.
Description:Please note that you won't be able to witness this event if you have collected all effects.
In the dream room, keep waiting until you hear an alarm sound. Then, check the drawer next to you; a short cutscene will begin, showing with that appears to be some kind of fetus. The sound of a cardiometer can be heard in the background as well. Pressing any key will make Soutarou come back from the "trance" laying on the ground.
Viewing this event highly decreases your Sanity Level.
Black Stone World's Ghosts
Location: Black Stone World.
Effect Needed: Brass Knuckles.
Required Sanity: Any.
Description:: If you equip the Brass Knuckles effect in the Black Stone World, the ghosts wandering in the world will immediately disappear and you won't be able to hurt any of them.
Behind The Doors
Location: Door World.
Effect Needed: None.
Required Sanity: Any.
Description:: In Door World, there is a dark blue door which disappears upon interaction and a green door that, when interacted with, will slightly open, revealing a big red eye behind it.
There is also a random chance that if you try to open any locked door, they will all open and show multiple red eyes.
Manor Shenanigans
Location: Maid Mansion.
Effect Needed: Brass Knuckles/Picture Frame.
Required Sanity: Any.
Description: Somewhere in the Rain Puddle World's sewers is a brown sliding door that is entrance to a manor, where dozens of housemaids will bow down before Soutarou every time he enters a hallway or a room, except when you have a certain effect equipped. If Soutarou wears the Brass Knuckles before them, they will look down on him, before forcing him to unequip it.
In the room that's home to the Picture Frame effect, using the latter will result in the original frame being fractured as well.
The Manor's Secret
Location: Maid Mansion.
Effect Needed: None.
Required Sanity: Any.
Description: In the manor, there is a room with a moveable object that blocks a secret room. On the left side, there is a view of a river of blood. When exiting this room, Soutarou will look back at the scenery one more time before coming back to the manor.
However, if you have very high sanity, walking up to the scenery may cause Soutarou to have a pained expression on his face and fall to his knees before waking up.
Gray Buildings Shenanigans
Location: Assembly Line.
Effect Needed: None.
Required Sanity: Any.
Description: From the starting point when entering from Black Stone World, go left, then down. If you try to go into the doorway on the right here, it will disappear without warning and you will hear laughter.
You can also go right twice, then down. In this room, there is a hole if your mental state is below ten, and a round red creature with a single eye if it is above ten.
(Feigning) Ignorance
Location: Prison.
Effect Needed: None.
Required Sanity: Any.
Description: Find the large doorway in the gray building. Go upstairs, until you're on the third floor - the one after the floating gray teleporter. Attempting to go up again will result in Soutarou immediately going back out, with an uneasy expression on his face.
A similar event happens when you try to open the bloody dresser in the Rooms of Nothingness. The screen will fade to black, preventing you from seeing what's inside. Although this time, he'll act like there's nothing of note in there.
White Building
Location: Old Arcade.
Effect Needed: None.
Required Sanity: Any.
Description: In the arcade, interact with the machine that has a white screen to trigger a little cutscene, showing what seems to be either a church or a hospital. It won't do anything once it's over, but the next time Soutarou sleeps, another cutscene of that same building will show up, waking him up immediately.
The Arcade Chaser
Location: Old Arcade.
Effect Needed: None.
Required Sanity: Any.
Description: In the second room of the same arcade, a blond-haired chaser can be found playing on an arcade machine. Trying to hit him with the Brass Knuckles - or to disturb him with several other effects - will result in him looking at Soutarou menacingly, revealing as well his hostile nature.
Glitching the Dream
Location: FC World.
Effect Needed: Distortion.
Required Sanity: Any.
Description: While in the FC World, equip the Distort effect and press the action key. The screen will glitch, while a loud noise plays, before Soutarou wakes up.
The Shapeshifter
Location: Inorganic Building.
Effect Needed: Brass Knuckles.
Required Sanity: Any.
Description: Using the Brass Knuckles effect on Shokushu with the bag off Soutarou's head and allowing him to catch Soutarou will take him to an inescapable area with an NPC who shapeshifts in reaction to two effects. If you use the Both Hands effect, her head becomes a silhouette of hands, resembling elk horns. If you use the Black Cat effect, her head becomes a silhouette of a cat's head. She also can be killed.
Cursed Room
Location: Migraine Hallways.
Effect Needed: None.
Required Sanity: Low.
Description: Entering the top left door, then the rightmost door. Walk to the top right corner and try to interact with the box there. Return to the entrance to trigger the event; the floor starts to get darker, and the door will be locked, preventing you from exiting the room. Several arms then appear, chasing Soutarou. Touching one of them will force him to wake up.
After that, if you try to come back there, Soutarou will automatically refuse to do so.
Room of Bad Memories
Location: Migraine Hallways.
Effect Needed: None.
Required Sanity: Any.
Description: This is a random event (1/500% chance after seeing Cursed Room) but interacting with the papers on the wall in the room with one paper (left of the Clot effect room) and the room with many papers (on the hallway to the right) may improve this chance. Going back to the top left hallway, enter the second door and pace around in this empty room until Soutarou falls to his knees and sees a scene from his past. (This may only happen when you attempt to leave the room.)
Sewer Monster
Location: Sewers.
Effect Needed: None.
Required Sanity: Any.
Description: Somewhere in the sewers - that are accessible by going into a hole in one of the prison's cells, a doorway will take you to platform surrounded by waste, where dwells a one-eyed green monster. If you dare interact with him, Soutarou will be submerged by him as soon as he tries to leave, forcing him to wake up.
The Little Girl in the Streets
Location: Abandoned Rooftops.
Effect Needed: None.
Required Sanity: Any.
Description: By going between the two lampposts in the Case effect's area, you'll find yourself in a backstreet where a blonde little girl can be found. Most of the time, she'll be wandering, although there is a chance to find her sitting. If you re-enter this area again, there are odds that Soutarou will find her unconscious, apparently injured and probably dead - or dying. He'll head towards her and, desperate, finally falls on his knees before waking up.
Note that, when near this girl, Soutarou will refuse to equip any gruesome effects, like Centipede, Brass Knuckles or Case.
Cat Basket's Flying Event
Location: Dirt Field.
Effect Needed: Black Cat.
Required Sanity: Any.
Description: If it is night in the Dirt Field (indicated by being slightly darker than normal, this changes every two dream sessions), go up between four metal rods with a symmetrical grass pattern around them. Then go up and enter the building, go up all the stairs until you reach a big balcony. If it is night, there is a chance for a creature that looks like a hybrid of a cat and basket to be here. By using the Black Cat Effect and interact with Basket Cat, you will start a controllable flight cutscene with Soutarou in Black Cat form, sitting in Cat Basket, while Cat Basket itself is flying, on a background of night sky.
Smiling Himemi
Location: Gray Wasteland.
Effect Needed: None.
Required Sanity: Any.
Description: Similar to the Poniko/Uboa Event from Yume Nikki. To trigger this event, enter the second-to-last house in the Gray Wasteland. It appears empty except for a big chair, which Soutarou can sit in. When you leave, a girl is briefly visible sitting in the chair. Repeatedly enter and leave the house (1 in 64 chance when entering) until the girl is visible while entering. From that point, the door locks and Soutarou can't leave her house. If Soutarou interacts with her, she will initially give him a cute smile, before turning into a creepy one, and then waking Soutarou up.
Eye Box
Location: Sepia Island.
Effect Needed: Brass Knuckles.
Required Sanity: Any.
Description: An event that works the same way as the Eye Box event from Yume Nikki. Find the box located east on the Monochrome Island, equip the Brass Knuckles and interact with the object. Doing so has a chance to teleport you to a small room. Going into one of the doorways will only lead you to the other one, meaning that this room is a loop - you can verify it by using the Envelope effect. Interacting with the box again will bring you back to the Monochrome Island.
Cave Chaser
Location: Dim Cave.
Effect Needed: None.
Required Sanity: Any.
Description: In the cave, there is a small hole in the wall at eye level. If Soutarou looks through it, he sees a calm chaser with blonde hair. If Soutarou looks through it again and the chaser is gone, he appears behind Soutarou and eats him offscreen, forcing Soutarou to wake up.
Vending Machine Chaser
Location: Serene Hill.
Effect Needed: None.
Required Sanity: Any.
Description: This event requires you to have less than 100 yen. When you arrive at the end of Serene Hill, if a blond-haired chaser is there, try to buy a drink from the vending machine and then interact with him. The chaser will go to the vending machine, buy one and give it to you. He will then wink at Soutarou.
Unusual Inescapable Areas
Location: Gray Building.
Effect Needed: Brass Knuckles.
Required Sanity: Any.
Description: Enter the Door World. Go left and up, enter the gray door. Head down then right to the Monochrome Island. Go north and enter the building. Go north-west and through the door frame. Go right until you're inside a building. Use the Brass Knuckles without the bag on Soutarou's head, hit the chaser and let him chase and catch you, first inescapable area that you can visit by bother chaser is Monochrome Hill after door world, there you can find a little black haired Soutarou, he can be killed.
From the entrance of the Assembly Line from Black Stone World; go up, up and left, use Brass Knuckles without the bag on Soutarou's head, hit the chaser and let him catch you. Soutarou will then be teleported to the Monochrome Pixel Room; a strange white room with a furniture, clock and door that is blocked by some kind of counter.
Railing NPC
Location: Cliffside Train Tracks.
Effect Needed: Picture Frame.
Required Sanity: Any.
Description: When Soutarou uses the Picture Frame effect near this NPC while you are in Foggy Bridge, it just disappears. However, if you use it in Cliffside Train Tracks this NPC lays in the water, seemingly dead.
White Cat
Location: Archaic Temple.
Effect Needed: Black Cat.
Required Sanity: Any.
Description: There is a white cat here, which can be in different places, determined randomly after Soutarou wakes up and falls asleep again. It can be sitting on some kind of pedestal in first room, inaccessible between four holes in the third room, sleeping the basket in fourth room, or outside of the building, sitting near the vending machine. If Soutarou uses the Brass Knuckles effect on the cat, it will run from him.