If you’re looking for Deltarune Chapter 5’s secret boss location and how to access it, this guide will help you. Before reading ahead, I would suggest completing the chapter first, as you must have the shortcut doors unlocked.
It’s a staple for the game to have a secret boss in all of its chapters, now including Chapter 5. Their locations are easy to find, but accessing the boss fight itself requires a tremendous amount of exploration. They’re always showered in obscurity.
Here is a guide for its location.
Table of contents
Where To Find Deltarune Chapter 5 Secret Boss?
Deltarune Chapter 5’s secret boss is hidden under the Flower Castle. Not in the ruins or its basement, but before the fight with all the flowers.
To find the secret boss’ location, return to the save point before the final fight with Flowery. Near it is a Warp door that you can use to visit other areas. So, use the Warp Door and fast travel to the Green’s Shop at the Top of Castle area.
Go right, and activate the Petal Feather. Jump and hit the flower above it to reach the upper level. Instead of going right to the flowers’ boss fight, turn left. Ralsei will say that the Dark Fountain isn’t this way, indicating you’re on the correct path.
Here, you will have to jump over the thorny petals. Jump and move forward by hitting the hanging flowers. If you fall, the section will restart from the last platform. Additionally, avoid Aqua’s swords, and once you reach the second platform with a gap in the middle, drop down.
Go left from here and hit Susie’s Rude Buster on the pin wheel to create an air flow that will descend you to the ground. While falling, break the blue petals to create a safe path and go through the circular bullets shot by Yellow’s guns.
And at the bottom, you will find a huge, pink door that’s guarding the secret boss. However, you will need a key to unlock it.
How To Unlock Deltarune Chapter 5 Secret Boss Fight?
The door to Deltarune Chapter 5’s secret boss fight requires the MysteryKey, which is only available at a specific shop in the game. To get to the shop, use the Warp Door near the boss’ door, and go to Cliffs’ Shop.
Ascend the staircase to your left to reach the shop with a save point nearby. Head inside, and in the Buy menu, you will find the MysteryKey. However, it requires a special type of currency: Pink Dollars. They’re hidden all over Chapter 5.
Here are their locations:
Pink Coin #1
From the Warp Door, go to the garden’s Hopschef. Activate the Petal Feather with the nearby statue, and head right. Break the thorny vines and fight against three of Aqua’s bullet patterns. Once defeated, move ahead and use Ralsei’s act on the leaf above, then jump across the gap using other leaves.
At the top, deactivate the Petal Feather and go inside the room. Speed through the torii gate while avoiding the Starwalker’s bullet, and ring the bell at the end.
The Starwalker will drop a chest containing the first Pink Coin.
Pink Coin #2
Return to the garden’s Hopschef Warp Door and go left to enter the scissor’s room. Pick up the watering pot from the middle, and keep moving left. Water the small pink grass to form a path, and head to the next area.
From the shallow waters, go above to find a pink container containing the second Pink Coin.
Pink Coin #3
Again, return to the garden’s Hopschef Warp Door and fast travel to the End of Garden in ‘Garden’. This will take you to the first light pillar of this world. Go right from here until you find the Petal Feather activator.
Rush left to fight Aqua’s bullet patterns, then pass through the speed torii gate ahead to find a pink stone. Jump and break it to find the third Pink Coin inside.
Pink Coin #4
Deactivate the Petal Feather and use the Warp Door to fast travel to Blue’s Room in the Castle. Go right (save the game if you’re low on health), and you will find a Petal Feather activator at the end. Use it, jump on the ledge, and run right to descend into the area.
At the lower levels, continue moving right to enter a room with neutral jumping flowers. Since they don’t have direction, these flowers will launch you in the opposite direction of where you hit them. It’s a bit tricky. To make a successful jump, hit the flowers at the top-center to launch yourself above. At the top, break the pink stone to find the fourth Pink Coin.
Pink Coin #5
For the fifth Pink Coin, return to Blue’s room and use the Warp Door. Fast travel to the Garden’s Near Shrine area, and go right. Past the vine, ascend the staircase to the shrine where you find the Petal Feather. Instead of descending the staircase, jump left to reach a vine’s leaf.
Climb the leaves until you see numerous bells above. Jump right from there to reach the shrine’s roof, and go right; don’t forget to jump to reach the hidden leaf. There, you will find the next Pink Coin.
Pink Coin #6
To get the sixth Pink Coin, use the ‘Near Shrine’ Warp Door and fast travel to Cliffs’ First Climb. Drop into the hole and activate the Petal Feather. Go right from here, defeat Seth’s book, and go left using the vine above (don’t jump on the high cliff to the right).
Keep moving left while using Ralsei as a platform until you see a wind geyser with a Petal Feather statue. There’s a vine near it. Use Ralsei to jump across the gap to find this pink coin inside the pink stone; I’ve already picked it up.
Pink Coin #7
After picking up the sixth pink coin, go right and deactivate the Petal Feather. Use the Wind Geyser to go above one level. Once you slide down the mountain to reach the wheat field, go left to find an area with vines.
Climb the first vine. Then, jump right to reach the next area with a watering pot that drops water after every few seconds. Use it to drop down to the coin to collect it; it’s in mid-air. I’ve already collected it.
Pink Coin #8
After dropping near the scarcrow enemy, use the umbrella enemy to jump above and reach the previous area. Activate the Petal Feather, drop below, and go left to find the next Petal Feather statue; deactivate it. Use the wind geyser to go above, and use the Warp Door to teleport to the Cliffs’ Shop; the same shop from where you can purchase the MysteryKey.
Go right from the shop, cross the wheat field, and activate Pearl Feather. Suddenly, a vine will appear before you. Act Ralsei on it to use him as a platform. Jump on him, and when the vine goes up, use Susie’s Rude Buster on the pinwheel above.
Drop to the golden flowers below. See the little vines to the left of the golden flowers? Stand there, and use Ralsei’s act on one of the golden flowers’ roots, and then jump on him. Let the wind take you to the right. However, Aqua’s swords and attack patterns will attack you. Avoid them, and then jump on the ledge to reach the next area.
In the next room, climb the umbrella and immediately jump on it to reach the upper level. Fight against Seth’s book, and after defeating them, go right to find the pink stone containing the eighth Pink Coin.
Pink Coin #9
Now, it’s time to return to the Shop’s Warp Door. Go left after obtaining the eighth Pink Coin, and use the pinwheel to switch the airflow. Hop on the golden flowers, avoid Aqua’s knives, and reach the beginning of this area.
Go through the speed torii gate and wheat fields again, then use the Warp Door and fast travel to Cliffs’ Netskie Climb. Turn right and climb the vines to the top; avoid the scissors. After reaching the top platform, where you had to figure out the real treasure box, move forward and enter the cave-ish area.
Activate the Petal Feather, go through the speed torii gate, and jump across the gaps in the cliff. Just keep moving, and at the end, you will find the ninth Pink Coin inside the pink stone.
Pink Coin #10
For the final Pink Coin to buy the MysteryKey, drop from where you took the ninth pink coin. Move left from the bottom, then use the wind geyser to return to Netskie Climb. Use the Warp Door and fast travel to the Foyer in the Castle.
Go to the cafe, and one room to the right to find numerous spear-holding statues. Push all the statues over the edge; one of them is hostile. After all of them are pushed, return to the Foyer, and go down to return to the castle’s entrance.
Outside the castle, turn right, avoid the light pillar, and head inside the other room. You will find all five of the spear-holding statues there. Push them onto the switches behind them to create a path to the pink chest. Finally, open the chest to find the last Pink Coin.
Unlocking The Secret Boss Fight Door
With ten Pink Coins in your hands, return to the Foyer and use the Warp Door to fast travel to the Cliffs’ Shop. Buy the MysterKey, then use the Warp Door again; travel to the Pink Door at the Top of Castle area.
Use the key to open the pink door, and move inside to meet Mad Mew Mew, the secret boss of chapter five. Unlike any other secret boss before, Mad Mew Mew lives up to her name. The fight is extremely chaotic, so I would suggest buying plenty of healing items before you fight her!
Oh, and if you’re a fan of Vocaloid, you would love Mew Mew’s soundtrack.
With this, our Deltarune Chapter 5’s Secret Boss Location guide comes to an end. Check out our complete walkthrough hub for Deltarune Chapter 5 right here.
Looking for more guides and walkthroughs? Please check the links below:
- Into Indie Games Homepage
- My Winter Car Walkthrough & Guide Hub
- Heartopia Walkthrough Hub
- Ancient Farm – Guides And Walkthrough Hub
- DuneCrawl Complete Walkthrough
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