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Complete walkthrough for the OMORI x Yume Nikki Crossover Fangame.
Walkthrough
The game follows a somewhat linear path and effects are gained as the story progresses. It's recommended to interact with everything to see some fun interactions with characters, but this guide only covers how to get to the end.
Pink Sea
In your bedroom, go to sleep. You'll soon be joined by the rest of your party. Enter the right door in the nexus. In the Pink Sea, go south, then west. Defeat the enemy (combat is pretty straightforward; avoid the obstacles and shoot at the enemy to drain their health), then smash the watermelon to get the Knife effect. Use it to cut the trees blocking you and go east. Ignore any balloons and go southeast. Continue until you reach Urotsuki to save and heal your party with her picnic basket. Ahead is the first boss: Kyuukyuu-kun. Avoid his burst attacks and the tentacles the rise from the bottom of the screen. After the fight, go right and enter the door to unlock it in the nexus.
Snow World
In Snow World, continue east to find Mafurako. She's missing her scarf, so she asks you to find it for her. Go south and smash the watermelon to get the Umbrella effect. This effect is useful for pressing buttons that Madotsuki cannot reach otherwise. Equip the new effect and walk over the diamond button, use the Umbrella to summon a rain cloud to press it. Continue this for each button to progress and go right when you reach the bottom. Use the Umbrella and Knife effects to reach a snowman. He won't give you Mafurako's scarf at first, so use the Umbrella to summon some rain to change his mind. Backtrack all the way to Mafurako to return her scarf. Head east to see Mafurako and Kamakurako. Mafurako will move Kamakurako and propose an idea for a prank. Continue east, save and heal with Urotsuki, and prepare for the next boss battle: Yuki-onna and FC Demon. You can take them out in either order. Yuki-onna has a somewhat slow and consistent spiral attack, while the FC Demon has homing attacks. Once they're defeated, a short scene will play out. After it, continue east and into the White Desert. Enter the door to unlock it in the nexus.
White Desert
In the White Desert, go northwest and find the Stop Light effect. Use it to smash the rocks and access the northwest area of the White Desert. When Monoko is controlled by the Stop Light, her hit box is treated just like Madotsuki's, so she can used to quickly move between areas. Fight the Dave Spector and use the Knife and Stop Light to clear a path through the obstacles and step on the eyeball at the top of the area. Go back south, then northeast. For this puzzle, use the Stop Light to press the button to get to the eyeball. Once both eyeballs have been interacted with, the center path clears at the north part of the White Desert. Save and heal with Urostuki and prepare for the final boss. You should be able to defeat them at any level, but you'll deal more damage and be able to take more damage the higher your level, making the fight quicker. If you can't defeat the boss in one or two tries, you can level grind with Dave Spectors. After defeating them, the ending will play out, but you can still keep playing afterwards.