Wall World Colony Guide: Food, Power, Research, and the First Zyrex Attack

The best opening for a Wall World colony is to establish food and water close to the Core, connect both buildings by road, and save construction materials for early defenses. Build batteries before bad weather arrives because rain can provide water while also stopping solar generation. Keep checking the swarm countdown so you know when to stop expanding and prepare for the first Zyrex attack.

This guide follows the opening described for the PC release launched on November 11, 2026, according to the Game Truth first colony guide. Weather, resource deposits, and Zyrex approach directions can vary between runs, so use the layout and forecast shown in your game when choosing locations.

Establish Food and Water First

Open the Food and Water section of the build menu and place the Canteen and Rain Collector near the Core. Keeping them close together makes it easier to create a short road network and extend that network to later buildings.

Follow these steps:

1. Place the Canteen near the Core.
2. Place the Rain Collector nearby, leaving room for another collector if needed.
3. Use the road tool to connect the Canteen to the Core.
4. Connect the Rain Collector to the same road network.
5. Assign workers to the Canteen.
6. Open the Canteen’s Production panel and confirm its biomass input and food-ration output.
7. Watch the water stockpile while it rains to determine whether collection is keeping up with demand.

The Canteen converts biomass into food rations, while the Rain Collector gathers water during rain. A building can appear close to the Core but still lack a connection if the road does not reach the main network. If a completed building reports that it is disconnected, trace the route back to the Core and repair or extend the road.

Building both structures awards the Bread and Water Steam achievement. Afterward, check your stockpiles rather than immediately adding more production. If food rations continue to fall, inspect the available biomass first. A second Canteen uses the same biomass supply, so it may worsen the shortage. A second Rain Collector is more useful when water consumption is higher than one collector can replenish during rainfall.

Reserve metal for the Rain Collector and its road before expanding toward another deposit. If you run short on construction materials, mine the rock face or dismantle buildings you no longer need. Before removing a structure beside a main road, trace the route from the Core to buildings farther away so you do not accidentally break their connections.

Protect the Power Supply

The Core supplies some electricity and has limited storage, but its capacity is not enough to preserve every surplus generation cycle. Once storage is full, additional generation is wasted unless you have added battery capacity. Build batteries while your Solar Panels are still receiving enough sunlight to charge them.

When placing power buildings, use the light-blue cells to identify the Power Grid. A Solar Panel must have a grid connection to deliver power. Roads provide a route to the Core, while the blue placement overlay indicates whether a location can connect to the grid.

1. Select Solar Panel in the Energy section.
2. Place it on a light-blue grid cell.
3. Add battery storage within the Power Grid.
4. Check the reserve after a sunny period.
5. Compare the stored amount with the power consumed after sunlight falls.

Rain is especially important to plan around because it supports water collection but can also interrupt solar production. Store enough electricity to keep essential systems running while generation is reduced. When wind power becomes available through research, it can reduce dependence on sunlight, but batteries remain useful for storing surplus energy.

House and Support Colonists

Build Barracks as the population grows so there are enough beds for your colonists. Once the Field Hospital is available, place one near the Core. Injured colonists may be unable to work, and untreated injuries can leave important production buildings without enough assigned workers.

If the Field Hospital has open jobs while the injured-colonist count is increasing, fill those jobs before constructing another worker-dependent building. This helps prevent a medical shortage from becoming a food, water, or power shortage.

Build a Laboratory from the Technologies tab and assign engineers to it. The laboratory unlocks research paths that improve the colony’s long-term stability:

• The Canteen branch leads to Small Greenhouse, which provides a way to grow biomass.
• The Rain Collector branch leads to Small Condensers, which provide another water source.
• The Field Hospital branch includes Advanced Treatment Methods.
• The Advanced Laboratory tier becomes important if nearby biomass is being depleted.
• Repair Workshop research leads to the Repair Shop needed after the first attack.

The For a Rainy Day Steam achievement tracks 300 units of water and 250 food rations stored at the same time. Work toward it after your basic production and power systems are stable rather than draining reserves during expansion.

Prepare for the First Zyrex Attack

Watch the swarm countdown in the lower-left corner of the screen. Begin defense construction while there are still hours remaining, especially if the On the Front Line objective is active. That objective requires two Outposts and a successful defense.

1. Open the Defense section of the build menu.
2. Place two Outposts.
3. Keep the Outposts near the food and power buildings that must remain operational.
4. If you paused while placing them, resume time.
5. Confirm that the Build Outposts counter reads 2/2 before the swarm arrives.
6. Keep the defenses powered until the attack ends.

Expanding toward another deposit before the attack increases the length of Wall that must be defended. Because the approach direction can vary between runs, use the current map rather than relying on one fixed placement pattern. The Prepare and repel the attack objective tracks the result, and successfully repelling the first attack awards the First Onslaught Steam achievement.

Repair the Colony After the Attack

Check the Core’s integrity when the attack is over. If the Discoveries Needed objective appears, you must have a Laboratory, research Repair Workshop, and construct a Repair Shop.

1. Research Repair Workshop through the Laboratory.
2. Build a Repair Shop.
3. Assign engineers to it.
4. Open Damaged Buildings in the Repair Shop panel.
5. Review each building’s durability and repair cost.
6. Use the batch repair control if multiple structures are damaged and you can afford the materials.

If resources are limited, repair the buildings responsible for food and power first. Those systems support every later recovery step. When the Iron Fortress objective becomes available, research Core Turrets and build four turrets on the Core to complete it.

Early Colony Checklist

Before the first Zyrex swarm arrives, confirm that you have:

• A Canteen connected to the Core by road.
• A Rain Collector connected to the same road network.
• Workers assigned to food production.
• Batteries storing surplus solar power.
• Two Outposts completed and showing 2/2.
• Enough food, water, construction materials, and electricity for the attack.
• A Laboratory operating with assigned engineers.
• A repair plan for damaged buildings after the battle.