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In Chapter 2 of Deltarune, you might meet a character named Hacker. He will ask you to find three blue checkmarks hidden around the Cyber Field. These checkmarks are optional, but finding each one is connected to uncovering a major secret in this chapter. If you find all three checkmarks, you’ll get the chance to face a hidden boss, but only after completing all the tasks Hacker gives you.
Once you enter the Library’s Dark World, the Cyber Field is the first big area you’ll explore. To find Hacker, follow the normal path through the area, then go to the spot where you see two robots with stereo heads. After your first encounter with Queen, take the east exit to go up to the next screen. There, you’ll find Hacker and begin your journey toward the chapter’s secret boss fight.
Locations of All Blue Checkmarks in Deltarune Chapter 2
Find All Hidden Items in the Cyber World’s First Area
Right after leaving Hacker’s area, head south to get back onto the main path. Every blue checkmark you need to find will come from opening a red chest or solving a puzzle. Once you find a checkmark, you can show it to Hacker and receive useful items for your team.
Below is a list of where each checkmark is located and what item you get from its chest, if any:
| Checkmark Number | Location | Additional Item from Chest |
|---|---|---|
| Checkmark 1 | From Hacker, go south along the main path. Dodge the obstacles, then go south again and cross the second obstacle. Head to the bottom right to open the red chest with the checkmark. | GlowWrist |
| Checkmark 2 | Inside the room with the two stereo-headed robots. Have Susie, Ralsei, and Kris jump on the spinning teacup platform in the middle. Rotate the platform to catch all 16 arrows, then jump off and open the checkmark chest. | None |
| Checkmark 3 | Still in the stereo robot room. Use the leftmost teacup platform to go up. Then, head to an area with a series of keys that spell out a word. Carefully press the keys to spell “GIASFELFEBREHBER” to unlock the final checkmark. | None |
Initially, a forcefield blocks the way north to the second and third checkmarks. To advance, you need to go east first and solve the “AGREE 2 ALL” keyboard puzzle. After completing this, return to where the forcefield was, then continue along the path to reach the area with three teacup rides. Use these platforms to access other parts of the area and find the remaining checkmarks.
Good news: if you mess up a puzzle, there are no penalties. Making a mistake or pressing the wrong key in the keyboard puzzle simply causes Kris to jump off, and you can try again without any issues.
After collecting all three checkmarks, you can return to Hacker and show them. He will set off a fireworks display as a reward. Later, Hacker will appear again in Queen’s Mansion and mention a secret passageway—an important step toward discovering some of the main secrets in Deltarune Chapter 2.
To get the Shadow Crystal in Chapter 2, you’ll need Hacker’s help after gathering all the checkmarks. While there’s no immediate reward for finding all of Hacker’s checkmarks, missing out on them isn’t worth it—they’re an important part of the game.
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