说明：  诺基亚手机贪吃蛇游戏的MATLAB版本，是简化的贪吃蛇游戏！
(SNAKE Graphical User Interface for playing "Nokia Classic Game" Snake. The Game: Make the snake grow longer by directing it to the food. Extra bonus points are given from hearts, eat them as fast as possible as amount of bonus points decreases with time. Higher level gives more points for the food but will also make it tougher to steer a long snake as speed increaces. Five different mazes as well as play w/o maze are possible.)