How to get KeyGen in Deltarune and unlock the secret boss
The KeyGen is one of the most important hidden items in Deltarune Chapter 2. It opens a secret path that leads to a powerful hidden boss. If you want to unlock the full story and see everything the chapter has to offer, here¡¯s how to get the KeyGen and what to do next.
Deltarune Chapter 2 is filled with little secrets that only appear if you know where to look. One of the most interesting is the KeyGen. This special item is needed to open a secret path and unlock a hidden boss fight. You will need to explore carefully and pay attention to prices. The reward is totally worth it if you are ready for a challenge.
Here¡¯s everything you need to know about getting the KeyGen and how to use it in the game.
Travel to the Trash Zone
¡ª UNDERTALE / DELTARUNE (@UnderTale) May 30, 2025
Once you reach Queen¡¯s Mansion in Chapter 2, go outside and find the red door near the Colour Cafe. This is a portal that lets you go back to different areas you have already visited.
Choose the option that says Trash Zone. You will return to the area where you met Spamton for the first time. Start walking left and keep going until you reach the end of the street. There will be a small gap in the fence. Enter through that gap to find Spamton¡¯s hidden shop.
Buy the KeyGen from Spamton
When you talk to Spamton, select the option that says Buy More. You will see a list of random items that change often. Look at the top of the list for the item named KeyGen. The price of the KeyGen keeps going up and down. Sometimes it may show a huge number like nineteen thousand Kromer. Other times, it may drop to less than one hundred.
Wait for the price to fall below one hundred Kromer. When it does, quickly buy it. If the price is too high, just back out and check again after a few seconds. Once you buy the KeyGen, it will show up in your inventory under Key Items.
Reach the second floor of the Queen's Mansion
--> Don't sweat the difficulty. As long as you keep trying, you'll get it eventually.
¡ª UNDERTALE / DELTARUNE (@UnderTale) May 26, 2025
--> By the way, we put a lot of effort into making the lyrics work, but they're more or less impossible to read while you're playing... pic.twitter.com/xJl6x16IkK
Now you need to continue the story until you reach the second floor of Queen¡¯s Mansion. On the way, you will help the Tasque Manager with her Tasques. After this part, go past the large staircase until you reach an area with fast-moving cars.
Your goal is to press all the red stop buttons in that area. This will bring out a bunch of mice who clear the road for you.
Find the secret switch
After the road is cleared, walk into the hallway on the right side. You will enter a room with a giant teacup and lots of decorations. On the right side of the room, there is a tall pillar. Walk up to it and press it. You will hear a noise that means something has been activated. Now go further to the right. A hidden door will appear. This door leads to the basement.
Unlock the basement door
Walk through the hidden door and use your KeyGen on the glowing green lock. This will open the path to the secret basement under the mansion. Keep walking through the basement. You will go through a maze of dark hallways and strange machines. At the end, you will find an old, broken robot. Interact with it to get an item called the Empty Disk.
Take the Disk back to Spamton
That¡¯s not a translation error, that¡¯s just how this terrible beast makes conversation.
¡ª UNDERTALE / DELTARUNE (@UnderTale) May 20, 2025
Meet this enemy and many others when DELTARUNE Chapters 1-4 releases on June 4th! pic.twitter.com/MgMnGNsubC
Now return to Spamton¡¯s shop in the Trash Zone. Choose the Talking option when you speak to him. You will see a choice that says Give Disk. Select it. Spamton will take the disk from you, and his shop will close forever. So make sure you buy anything else you want before you give him the disk. Spamton will now load something new onto the disk.
Use the Loaded Disk and fight Spamton NEO
Go back to the secret basement in the mansion. This time, bring the loaded disk with you. Use it on the same old robot you found earlier. After a short silence, something strange will happen. You will now face Spamton NEO, one of the hardest and most exciting boss fights in the game. This battle is a big part of the hidden route and changes the story in a major way.
And that is how you get the KeyGen in Deltarune Chapter 2. This secret path takes effort, but the result is one of the best parts of the game.