In Chapter 2 of Deltarune, players who wander away from the main neon corridor of the Cyber Field will eventually meet Hacker, an NPC with an unusual fixation on validation. He asks the party to retrieve three blue checkmarks scattered around the area. The quest is optional, but ignoring it would be like snipping a loose thread only to discover that it holds the whole jacket together. Each blue checkmark works like a fuse in an old electrical panel; once all three are fitted, a hidden circuit crackles awake. Players who finish the errand and follow every later instruction from Hacker open the path to Chapter 2's secret boss and, eventually, the Shadow Crystal.
Where to Find Hacker
The hunt starts after entering the Library's Dark World. The Cyber Field is the first major region players explore, and Hacker is tucked slightly off the main route. To reach him, players should progress normally until after their first confrontation with Queen. On the following screen, there are two robots with stereos for heads. By taking the east exit in that room and moving upward on the next screen, players will find Hacker waiting to assign the task.
How the Checkmark Hunt Works
Immediately after leaving Hacker's area, players should continue south to return to the main path. Every blue checkmark will pop out of a red chest or be released from a puzzle. Once freed, the mark returns to Hacker for viewing, and the party receives a useful item for their trouble.
The route is best understood as a metro line with one stubborn turnstile. The first stop is available right away, but the northern branch stays closed until a keyboard puzzle throws the switch.
| Step | Area detail | What actually happens |
|---|---|---|
| 1 | South of Hacker, along the main Cyber Field path | The first blue checkmark bursts from a red chest; no forcefield is in the way |
| 2 | Eastward at the AGREE 2 ALL keyboard puzzle | Solving the puzzle removes the forcefield that blocks the northern route |
| 3 | Northern path with three teacup rides | The last two checkmarks are reached by using the teacup platforms to rise into separate areas |
Clearing the AGREE 2 ALL Roadblock
When players first try to walk north toward the later checkmarks, a forcefield stops them cold. This is the game's way of saying the next station is not yet powered. Instead of looking for a switch nearby, players should continue eastward to the "AGREE 2 ALL" keyboard puzzle. Completing this puzzle drops the barrier. Afterward, players can return to where the forcefield used to be and follow the path into a room with three teacup rides. The teacups serve as a vertical switchboard, carrying the party upward and into side spaces where the second and third marks are tucked away.
Returning the Checkmarks and the Hidden Payoff
With all three blue checkmarks collected, players can go back to Hacker. He responds by launching a fireworks display. At first glance it feels like polite applause rather than a vault opening—this is where many players check the quest off and move on. That is exactly the wrong instinct. Hacker reappears later in Queen's Mansion and mentions a secret passageway. That tip is essential for discovering one of Chapter 2's main secrets. In particular, players who want the Shadow Crystal will need Hacker's help after collecting all the checkmarks.
The immediate reward may be modest, but the quest functions less like a bonus objective and more like a key left under a doormat. The real treasure is the knowledge Hacker provides later. Collecting the three marks also satisfies one of the requirements for facing the secret boss, provided players continue to follow Hacker's instructions in the mansion. As of 2026, this chain remains one of Deltarune Chapter 2's quieter but most important detours, and missing it locks away one of the game's most intriguing pieces.
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