Y

Explanation
The y variable is a local variable that represents the y position of an object in a room.



There is an x|x-axis and an y-axis on the image. The number on the y-axis indicates where the object is relative to the point (0,0) in vertical direction.

The gray area indicates the upper left corner of a room in Game Maker. When editing a room, the white areas are never visible. However, objects can still be placed in that area, whether through the editor itself or by specifying in the creation code to create an object in that area with the appropriate coordinates.