Snake is a sub-genre of action video games where the player
maneuvers the end of a growing line, often themed as a snake.
The player must keep the snake from colliding with both other
obstacles and itself, which gets harder as the snake
lengthens.
Easy - the game is over only when the snake's head is touching
itself.
Medium - the snake's speed is increased, also bad apples may
occur.
Hard - the game is over by touching the edges of the board.