说明：  游戏中有一条贪吃的蛇，想要吃掉所有的食物，即游戏中的“豆”。在游戏中蛇身的单位大小就是一个“豆”的大小，所以蛇每吃一个“豆”就会相应地增加一个单位的长度。蛇身不断地增长，游戏的难度也会不断地增大。选择不同的难度级别，蛇爬行的速度就会加快，既而增大游戏难度。
(Game there is a greedy snake, want to eat all the food, that is the game of beans. 蛇身in the game the size of the units is a bean size, so each snake to eat a bean will be a corresponding increase in the length of a unit.蛇身constant growth, the difficulty of the game will continue to increase. Choose a different difficulty level, the snake will accelerate the speed of crawling, subsequently increasing the difficulty of the game.)