Right-click on the cube GameObject and select Create Empty, then rename the new object to Highlighters. For each state (UnMark, MarkAsHighlighted, MarkAsReachable, and MarkAsPath), add an empty ...
A GameObject is the base for everything in a scene. This includes characters, lights, cameras, and even empty markers. When it is on its own, it does nothing. It's what you attach to it that gives it ...