Surfing H3O

Tyrone King, Lara Barcella, Gareos, and six more boards:
Successfully complete the game under the normal difficulty setting.

Morsa, Serena Knox, Jojo, and six more boards:
Successfully complete the game under the semi-pro difficulty setting.

Mikey Sands, Largo, Lyco Sassa, and five more boards:
Successfully complete the game under the pro difficulty setting.

Surfoid and three more boards:
Successfully complete the game under the master difficulty setting. Alternately, get over 500 points on each of the levels.