Junk Machine (unofficial name) is the second boss from Sparkster (SNES).
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This boss is a giant machine with mechanical arms which moves on a conveyor belt. It constantly picks up the junk parts on the conveyor belt with its arms, using them either as projectiles or makeshift weapons.
The core above the machine is the weak spot. The player can take advantage of the rail above the boss to attack it and avoid most of its attacks.