Spike Pushers (スパイクプッシャーズ Spike Pushers?) is the boss of Wily Castle 1 in Mega Man 9. They are a series of small, stationary oni-like robots located at the ends of four "corridors". There's a large spiked ball on each corridor the machines continually shoot at, pushing them gradually to Mega Man's side. There are two variations of the Spike Pushers. Spike Pushers B are blue and fire one bullet at a consistent rate, but only push the spike ball a short distance. Spike Pushers R are red and fire a charged shot less frequently, but pushes the spiked ball at a much greater distance. Touching any of the large spiked balls will kill Mega Man instantly, even if the Shock Guard item is equipped.