Simplified version of the snake game in language, example of game implementation can be found on http://patorjk.com/games/snake/.

The game consists of a snake and food. The player can change the direction of the snake’s movement to avoid obstacle or reach food. If the snake eats food, then the player’s score increases; if the snake hits an obstacle, then the player loses. The goal of the player is to maximize her or his score. When the snake dies, the player loses and the game restarts.