Exploration
Sandustry Puzzles — Ancient Structures, Artifact Vaults, and How to Solve Them
Underground, Sandustry hides ancient temples and artifact vaults with environmental puzzles that test your tools, your pixel physics, and your judgment. The five archetypes below cover nearly every sealed room you will find.
Last updated: August 17, 2026
Finding puzzle rooms
Ancient structures and artifact vaults are scattered deep underground. You do not hunt for fixed map coordinates — you find them naturally by digging through walls and watching the Material Scanner for unminable ancient bricks.
If the cave suddenly becomes symmetrical, enclosed, or built around one specific obstacle, stop treating it like ordinary mining space. Inspect the obstacle before carving another tunnel.
Stuck prevention and reset
- Unstuck command. If a puzzle's pixel physics traps your character, open the pause menu and use the unstuck command. Do not delete the puzzle room to free yourself.
- Puzzle room reset button. Puzzle rooms include a reset button that clears the room's falling sand and liquids if you fail a sequence. The button is part of the puzzle — leave it in place.
Frostbed & Teleporter Gaps
Many ancient temples block progress with bottomless chasms or wide teleporting fields. Lava and steam will not help here — you need an ice bridge.
- Equip the Cryoblast gun and shoot nearby water pools or moisture sources to freeze them.
- Push the resulting ice chips into the gap to build a temporary solid ice bridge across the teleporter threshold.
- Cross the bridge, then claim the artifact. The same mechanic shows up in Frostbed-over-Water rooms: break the Frostbed, let Snow fall, and use the frozen crossing.
Lava & Scoria Switches
Deep vaults require filling ancient receptacles with molten lava, but running 1,200°C liquid through normal conveyor lines will burn your factory down. The solution routes the heat as a solid.
- Mine down to a lava pocket, then deploy your Cryoblast to cool the lava instantly into solid Scoria blocks.
- Mine the Scoria with your shovel or guns to produce loose Cinder.
- Route the Cinder onto standard transport lines — as a powder it rides belts and drones like any other solid.
- At the temple switch, reignite the Cinder with a Flamethrower or Napalm launcher to convert it back into liquid lava and activate the sensor.
Steam Generators & Pressure Chambers
Some puzzle doors only slide open when a specific amount of pressurized steam hits an overhead vent. The room is testing whether you can build a deliberate mass-evaporation reaction.
If you are short on materials, duplicate water inside the room by dropping it onto a napalm burst — a rapid evaporation spike that hits the pressure threshold in one cycle.
Stalactite & Slag Barriers
- Ice stalactites. Heavy ordnance like the Rocket Launcher barely chips thick ice. Use a Flamethrower to melt the stalactites cleanly instead.
- Hardened ancient slag. Apply steady fire or high-tier tool upgrades to disintegrate the slag completely. A single burst rarely finishes the job.
Patterns that survive a second visit
The reusable information you take from a puzzle is not the exact route — it is the shape of the room and which tool interacts with the material blocking progress. Three patterns cover most artifact rooms.
- Frostbed over Water. Break the Frostbed, let Snow fall into the Water, cross the frozen Ice. The room is testing the Snow-and-Water interaction, not one specific weapon.
- Dark maze. Bring the Flashlight, follow corridors one branch at a time, and backtrack from dead ends. Do not mine through maze walls as your first solution.
- Burnable or destructible entrance. If one deliberate material is sealing an obvious chamber, test the tool that affects that material before searching for a different entrance.
Claim the reward before you leave
Reaching the far side of a puzzle is not the final checkpoint. Interact with the artifact and confirm the reward state advances — the first artifact often grants Swift I and pushes the Augment Forge toward Triple Shot.
When to defer a room
If the room clearly revolves around one material and none of your current tools interact with it, leave and return after another meaningful tool unlock. Random tunneling rarely solves a tool-gated puzzle.
FAQ
Where do puzzles spawn in Sandustry?
Underground, inside ancient temples and artifact vaults. The Material Scanner flags unminable ancient bricks — that is the room's entrance. Dig toward structured, symmetrical chambers rather than random terrain.
Do I need a specific weapon to break the Frostbed?
No. The room is testing the Snow-and-Water interaction. A Shovel works early on, a Gun works later. Break the Frostbed with whatever you have that affects it.
How do I fill a lava switch without burning my factory?
Cool the lava to Scoria with a Cryoblast, break the Scoria into Cinder, move the Cinder on standard conveyors, then reignite with a Flamethrower at the switch. The transport line never sees liquid lava.
Is a puzzle room's reset button safe to delete?
No. The reset button is part of the puzzle — it clears falling sand and liquids when you fail a sequence. Deleting it removes the room's safety net and will leave you stuck in a half-failed state.