The head of the U.S. Patent Office is reexamining a decision to award Nintendo a patent that protects a common gameplay mechanic wherein an in-game character summons another sub-character to support it in battle in one of two battle modes.

The head of the U.S. Patent Office is reexamining a decision to award Nintendo a patent that protects a common gameplay mechanic wherein an in-game character summons another sub-character to support it in battle in one of two battle modes.