As patients glide through the virtual canyon, they can shoot snowballs at snowmen, igloos, robots and penguins standing on narrow ice shelves or floating in the river.

• 患者飞翔于虚拟峡谷之际，还可以朝位在狭窄凸岩上或漂浮于河中的雪人、小屋、机器人以及企鹅丢雪球。