[2022] cant find clay or sand?

You need to melt materials into the forge. "Sand" is the Forge's internal volume of molten 'Crushed Sand'.

Likewise for Clay. "Clay Soil" is the forge's internal volume of molten 'Clay".

Originally posted by Shurenai: You need to melt materials into the forge. "Sand" is the Forge's internal volume of molten 'Crushed Sand'.

Likewise for Clay. "Clay Soil" is the forge's internal volume of molten 'Clay".

^ This. You need to melt the Clay Soil/Crushed Sand in the forge- The same way you need to melt iron/brass/lead. Right hand side of the interface, Below the fuel slots and above the output slots are the Input slots- Put your Clay Soil/Crushed Sand/Iron/Etc into the input slots to melt them down while the forge is on.