Pig Cart (unofficial name) is an enemy from Rocket Knight Adventures.
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Pig Carts are minecarts ridden by pigs, found in the rail section of the game's second stage. They move forward in the direction of Sparkster, throwing several bombs at him. A single attack is enough to dispatch them, but they constantly come from both sides. After a while they'll start coming in large numbers from the top rail, dropping bombs on Sparkster from above.