The Spark Machine (official name unknown) is a minor stage enemy exclusive of the NES version Strider.
The Spark Machine is a stationary defense machine. It is a small, red robot with a square shape and a single drill-arm in its front. This robot remains inmobile in its place and, once Hiryu approaches it, starts hitting its drill into the ground several times until it releases 3 Spark Balls, similar to Hiryu's Trick of the same name.
It repeats its attack once the three spark balls leave the screen. While it is hard to stop the enemy from attacking, the sparks can be jumped over as they leave enough space between them.