From Sonic Retro
When fighting
Hammer Eggman (トンカチエッグマン), the
Aquatic Ruin Zone boss, the first things noticeable are the two totem poles that rise up out of the ground with openings on the faces' mouths. Next, notice
Eggman inside another hovercraft, this time with a giant hammer attached to the front of it. Eggman will stay above the two tall poles, just out of your reach. That being said, Eggman will fly back and forth, smacking both totem poles with his massive hammer. Upon doing so, arrows will be propelled out of the mouths and stick into the corresponding section of the pole across the screen. The goal here is to use the arrows as stepping stones to reach Eggman. Hop onto the top of either pole and bounce off of Eggman twice before he starts to fly away across screen. Repeat this process until Robotnik's defeated.
Technical Information
