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This value represents the Y-axis position from which the Alien
enters into the game and begins to follow his path.
Because of this reference system, all the values between 0px and 24px pin the sprite between the usual game screen (168px) and a virtual Clip Area (24px), in order to allow the sprites to smoothly get in/out to/from the screen. |
See also: 
|
Values which
are considered worth as StartY, are in the range between 0px
and 192px, localizing where has been clipped the leftmost upper pixel in the sprite's 16x16
hires pixelgrid.