Kata Happiken is considered an intermediate level kata typically taught to green belt and brown belt practitioners. The kata was developed by Hanshi Hisataka specifically to assist North American karateka when he was in the United States circa 1964 through 1967. Hanshi Hisataka believed that the geometry and movements of Happiken were more suited to the western mind than those of other katas available at this level.
The kata name literally means “to use the fist like a monkey in 8 directions”. The kata is geared to close fighting situations as it uses a great many elbow strikes and emphasizes strong postures and stances.