Goldifact

Goldifacts, (A portmanteau of the words "Golden" and Artifact") are the most important collectible in Knock on Wood.

Background
Little is known about where they come from, but they seem to activate any Treant doors, making it plausible that they have Treant Origins. There is a different design for each world, and it is unknown what the original appearance is.

Usage
You can find them by completing simple tasks or locating them in hard-to-reach places. They are primarily used to open special doors. Most doors require the amount you've found in the previous world.