It's time for the Annual Ocean Shores Surf Contest but when Otto, Reggie, Twister and Sam reach the beach they discover that half of the sand is missing, and the surf contest has been postponed. The head of a mysterious new robotics company, Mr. A.I. Golem, vows to get to the bottom of the missing sand. However the kids aren't buying into Golem Inc.'s generosity. Instead Otto, Reggie, Twister and Sam will try to solve the mystery themselves. You need to travel around Ocean Shores (using skateboards, bikes, etc.) and complete the various courses ahead to solve who stole the sand.