卡雷尔公司设计了一个新的探测机器人，探索新的地形的能力，该机器人可以在各种地形上移动，它只需要更多的燃料在崎岖地形中移动，以及平原地形较少的燃料。这个机器人唯一的问题是它只能垂直移动，机器人只能移动到位于北境、East、South或其位置以西的网格上。(Karell Incorporated has designed a new exploration robot that has the ability to explore new terrains, this new robot can move in all kinds of terrain, it only needs more fuel to move in rough terrains, and less fuel in plain terrains. The only problem this robot has is that it can only move orthogonally, the robot can only move to the grids that are at the North, East, South or West of its position.)