District 3 Walkthrough: Thermal Foundry

The Thermal Foundry is the district where Neon Burrow starts testing your sense of timing. The colours shift to orange, red and molten yellow, the soundtrack jumps to an urgent 118 beats per minute, and the floor fills with machinery that wants to hurt you on a schedule. On top of that, the Foundry introduces the Swarm Drone pack, the first enemy that coordinates its attack. This walkthrough breaks down every hazard rhythm and gives you a route that keeps the drones off your back.

District at a glance

• Enemies: two Seekers and one Swarm Drone group of three
• Extraction timer: 38 seconds
• Hazards: heat vents, conveyor belts, timed laser barriers
• Enemy speed multiplier: 1.06 times baseline

Heat vents: watch for the glow

Heat vents are floor tiles that periodically flare. Each vent runs on a four-second cycle. For most of that cycle the vent is idle and completely safe to walk over. Then it starts to glow as it warms up, a warning that lasts a little under a second. Finally it flares for about one second, and touching it during that flare costs a hit point with the message "Scorched by a heat vent".

The key detail is that vents are not synchronized. Each one has an offset based on its position, so a row of vents creates a rolling wave of flares rather than one big flash. That sounds intimidating, but it actually helps: there is almost always a safe vent nearby, and the warm-up glow tells you exactly which ones to avoid.

The practical rule is simple. If a vent is glowing, do not step on it. If it is dark, go. A dark vent gives you more than two seconds of safety, which at Pip's speed is enough to cross ten tiles.

Conveyor belts: free speed, if you want it

Conveyors push Pip in a fixed direction and raise your movement speed to at least 6.2 tiles per second while you are on them. That is faster than your base speed and faster than every Seeker in the game, which makes conveyors excellent escape routes.

The danger is that a conveyor commits you. Once you are riding, turning around is slow, so you should always know where a belt leads before stepping on. Some belts feed directly into vent rows; riding one blindly while the vents are warming is a common way to lose a hit point.

Laser barriers: a three-second metronome

The Foundry's corridors contain laser barriers that switch on and off. Each laser follows a three-second cycle: on for 1.5 seconds, off for 1.5 seconds. Neighbouring laser tiles are offset by half a cycle, so in a corridor with two lasers in a row, one is always on while the other is off.

This alternation is the key to the Foundry. You cannot simply wait for every laser to drop at once, because that never happens. Instead, move through in two steps: wait for the first beam to drop, step past it into the gap, and then wait for the second beam to drop. Touching an active beam costs one hit point with the message "Cut by a laser".

Time Spark makes lasers trivial. While it is active, hazards run at half speed, which stretches each 1.5-second window to three seconds. Phase Shift is even simpler, since it ignores hazards completely for its duration.

The Swarm Drone pack

The Foundry's signature enemy is a group of three yellow Swarm Drones. Drones are the fastest regular enemy in the game, and they hunt together using three distinct roles:

• One drone chases you directly.
• One aims at a spot about four tiles ahead of the direction you are facing, trying to cut you off.
• One aims at a spot about three tiles behind you, closing the escape route.

When any drone gets within two tiles, it abandons its role and comes straight at you. The result is a pincer that closes from the front and back simultaneously. Running in a straight line is the worst possible response, because it gives the forward drone an easy interception point.

The counter-play is to change direction often. Every time you turn, the forward drone's target point swings to a new corridor and it has to re-path. Even better, drones are fragile. Overcharge destroys them on contact for 200 points each, and they take eight seconds to respawn. With Overcharge's six-second cooldown, a confident player can keep the pack thinned out for most of the district.

Recommended route

Start by identifying where the drone pack is patrolling and work the opposite side of the map first. Collect seeds in the vent-free corridors while the lasers and vents are still unfamiliar. Use one or two conveyor rides to move quickly between halves.

When the drones approach, fire Overcharge into the pack. Taking out even one drone breaks their formation and makes the remaining two much less dangerous. Then return to seed collection.

Aim to arm the core with Overcharge already off cooldown and with a conveyor-assisted path toward the portal in mind.

Extraction in the Foundry

Thirty-eight seconds is a comfortable window, but the Foundry's hazards keep running during extraction. The two main risks are a laser corridor between you and the portal, and a pursuing Seeker forcing you into a vent row at the wrong moment.

Save Time Spark for the extraction. Three seconds of half-speed hazards and half-speed enemies is enough to cross the most dangerous section of almost any route.

Upgrades that help here

• Cooldown Reduction lets you fire Overcharge into the drone pack more often.
• Ability Duration stretches Time Spark, which directly widens laser and vent windows.
• Speed Boost helps you outpace the Seekers on non-conveyor tiles.

What the Foundry teaches you

The Foundry is where many players hit their first wall, and it is almost always because they treat the hazards as random. They are not. Vents glow before they fire, lasers tick like a metronome, and the drone pack follows readable rules. Spend a run simply watching, and the Foundry becomes a rhythm game you can win. Next comes the Crystal Network, where the walls themselves start to move.