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Hollow Knight: Silksong — How to Solve the Cogwork Core Puzzle and Get Architect’s Melody

Align the yellow melody lines on all four Cogwork Core pillars, then play the Needolin at the central stage to learn Architect’s Melody. This route is for Act 2.
Length2 min Posted Quest giverVGSources Team
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In Act 2, solve the Cogwork Core puzzle by rotating the segments on all four pillars until each yellow melody line connects from top to bottom. When all four pillars sink, stand on the central stage and play the Needolin to learn Architect’s Melody. This walkthrough covers the Act 2 route; the Core changes in Act 3.

Before you climb to the puzzle

The puzzle is at the top of Cogwork Core in the Citadel. First defeat the Cogwork Dancers, then inspect the sealed lift they guarded to open the route through Choral Chambers. For the upper route described here, Clawline is needed or strongly recommended for the grapple sections; you also need the Needolin to claim the melody at the end. Quest walkthrough Act 2 route guide

How to reach the four-pillar chamber

Enter Cogwork Core and climb the platforming route across rotating cogs. The approach includes hazards such as sawblades, retracting spikes, grapple rings and rotating spike-cogs. The route guide recommends resting at the previous bench, since it reports no bench in the Architect’s Melody room. Act 2 route guide

Double jump can help, but the route guide says it is optional for this climb if you use Clawline, wall movement and careful timing. Pogo bounces and Faydown Cloak double jumps are other ways to make sections easier. Quest walkthrough Act 2 route guide

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How to solve the four musical pillars

  1. At the summit, inspect the four pillars. Each has rotating segments marked with musical notation and a lever that changes their positions.

  2. Use a pillar’s lever to rotate its segments until the yellow melody line forms one continuous path from the top segment through the bottom segment. Check the joins between neighboring segments rather than relying on a fixed number of rotations; the solution is shown by the connected line.

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  3. Repeat for all four pillars. A movable spotlight cart can help illuminate the notation. One lever is reached by taking a short wall-jump detour. Quest walkthrough

There is a movement consideration while solving: a pillar’s platforms disappear when that pillar is completed. The route guide suggests aligning three segments on each pillar first, then finishing the final segment on each when you are ready to lose those platforms. This is an optional way to preserve routes through the room, not a different puzzle rule. Act 2 route guide

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Claim Architect’s Melody

Once all four pillars sink, go to the central plate or stage and play the Needolin when prompted. Hornet performs the assembled score and learns Architect’s Melody. It is one part of the Threefold Melody; the other two are Conductor’s Melody and Vaultkeeper’s Melody. Quest walkthrough Threefold Melody guide

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Act 2 route and Act 3 changes

These directions apply to Act 2. The route guide identifies its instructions as covering version 1.0.30000 and says Cogwork Core changes substantially in Act 3; the area is described as a different, ruined Core in that act. If you are in Act 3, do not expect this climb-and-four-pillar route to match your area. Act 2 route guide Cogwork Core area reference

Quick Recap

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Classic side-scrolling action, with all the modern trimmings.
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Hollow Knight - Nintendo Switch [Digital Code]
Classic side-scrolling action, with all the modern trimmings.
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Rank #4
Hollow Knight - Nintendo Switch [Digital Code]
  • Classic side-scrolling action, with all the modern trimmings.
  • Forge your own path! The world of Hallownest is expansive and open. Choose which paths you take, which enemies you face and find your own way forward.
  • Evolve with powerful new skills and abilities! Gain spells, strength and speed. Leap to new heights on ethereal wings. Dash forward in a blazing flash. Blast foes with fiery Soul!
  • Equip Charms! Ancient relics that offer bizarre new powers and abilities. Choose your favorites and make your journey unique!
  • An enormous cast of cute and creepy characters all brought to life with traditional 2D frame-by-frame animation.

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.

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