DnD

From Mario Fan Games Galaxy Wiki

Drag and drop (or Drag & drop, D&D, or DnD) refers to the visual coding method used by beginners to Game Maker coding. It is a less advanced method than the GML coding language and considered not as good and far less extensible, and is extremely limited compared to GML. Code created with DnD tends to become quite awkward to navigate as it grows longer and more complex, and there are a lot of things in GM that don't support DnD - in particular, scripts.

See Also