Gravity Run

In a futuristic world, your avatar is not running, but on a hover board.

Gravity Run is a skill running games. In a futuristic world, your avatar is not running, but on a hover board. However, the hover board will only work on the platform. When the game start, the hover board will be moving forward. The problem is the platform can only be on top or at the bottom. Your task is to keep your avatar and his hover board on the platform. If there is no platform then he will fall.