A Link to the PastMaster Sword will cause part of the Hokkubokku to break off. Once it is done to just its head, it will take three sword slashes to defeat.
The Hokkubokku does deal a good amount of damage, with it taking away two full hearts of damage from Link when contacted, even when Link is wearing the Blue Mail. However, it's biggest threat is one the Hokkubokku is found alongside several other enemies. The room can get very chaotic with the bouncing balls, so be sure to either defeat the balls immediately, or defeat all other enemies before tackling a Hokkubokku.
Tri Force Heroes
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A smooshed Hokkubokku from A Link to the Past.