Horse Head is an enemy that guards the entrance to King Yama's lair, alongside Ox Face. He is functionally identical to Ox Face except for appearance and spawn point. He will spawn shortly after entering 5-4 to the left of the Spelunker, about halfway to the edge of your screen (assuming you haven't moved). If kept alive, Horse Head will slowly walk towards the Spelunker and will as mentioned occasionally drop bombs. Furthermore, if the Spelunker is hanging onto a rope above, or if there is a gap in the floor, Horse Head may jump towards the Spelunker. He can jump about the height of a rope.