Blox Fruits players grinding for the CDK (Cursed Dual Katana) know how long the questline is — which makes hitting the CDK puzzle broken wall especially frustrating. This puzzle is required to progress the CDK craft, and when it glitches, the entire questline halts. Here are all confirmed causes and fixes.
What is the CDK puzzle?
The CDK questline involves collecting specific items and solving a puzzle mechanic tied to the portal or stone sequence at a dedicated location in the Third Sea. The puzzle requires interacting with objects in a specific order. Any desync, missed interaction, or interference from other players can break the sequence and leave it unresponsive.
Common ways the CDK puzzle breaks
| Bug type | Symptom | Common cause |
|---|---|---|
| Object unresponsive | Clicking/pressing E does nothing | Another player interacted before you |
| Wrong sequence reset | Progress resets mid-puzzle | Server lag cleared the state |
| Invisible interaction prompt | No E prompt appears | Client rendering issue |
| Puzzle complete but no reward | Sequence finishes, nothing happens | Quest flag not synced |
| Portal does not open | Final step fails silently | Missing a prerequisite item |
Step-by-step fixes to try
Fix 1 — Rejoin a new server This resolves the majority of stuck-puzzle cases. The puzzle state is per-server. A fresh server gives you a clean puzzle to interact with.
Fix 2 — Solo the puzzle in a private server Other players interacting with the same puzzle objects are the most common cause of breaks. A private server eliminates this entirely.
Fix 3 — Verify your prerequisites Make sure you have every required item in your inventory before starting. Missing even one item can cause the final step to silently fail.
Fix 4 — Abandon and re-accept the quest If your quest log shows the step as complete but the reward did not trigger, abandoning and re-accepting from the quest NPC often resyncs the flag.
Fix 5 — Clear your inventory of similar items Some players report that having duplicate items (e.g., two versions of a key item from a previous failed run) confuses the turn-in check.
CDK materials checklist
| Item | Source | Quantity |
|---|---|---|
| Yama sword | Boss drop | 1 |
| Tushita sword | Celestial puzzle quest | 1 |
| Hallow Essence | Haunted Castle drop | 5 |
| God's Chalice | Various raid drops | 1 |
| Soul Guitar material | Soul Guitar quest | Varies |
The exact materials list changes with updates — always cross-check against the current Blox Fruits wiki.
Getting a private server for the CDK grind is almost mandatory at this stage of the game. To buy Robux for a private server or any missing game passes, Marix has Roblox gift cards available instantly.
FAQ
Can two players complete the CDK puzzle at the same time?
No. The puzzle is a single-instance mechanic. If two players attempt it simultaneously, both runs will likely break. Coordinate with your server or use a private instance.
Does server lag cause permanent puzzle breaks?
No. The puzzle resets when the server is restarted or when you switch to a new server. Nothing about the bug is permanent.
What if I completed the puzzle but the CDK did not craft?
This is usually a quest flag desync. Abandon the quest, rejoin, and try the final craft step again. If it persists, report it in the Blox Fruits Discord with your server ID.
Is the CDK still worth getting in 2026?
Yes. The Cursed Dual Katana remains one of the most powerful swords in the game for both PvP and PvE, and owning it unlocks story content. The grind is long but the result is worth it.
Can I use a friend's CDK materials to complete the quest faster?
Some materials are tradeable, others are quest-flagged and cannot be transferred. Check each item individually on the wiki before trying to trade.