Overview

Fuzzy logic helps to realize human like decision making in machines. The objective of the application is to use Fuzzy logic to create a smart controller that can control a snake in the classic snake game to get as much score as possible.

Introduction

Snake or Worm was first introduced in 1998 on the Nokia platform. Ever since, there is a surge in the interest in this game. The controls are intuitive, and the gameplay is simple yet addictive. The gameplay consists of the player controlling a snake to eat an item which in turn makes the snake longer. The rules of the game are such that the snake must not collide with its own body and a barrier, typically a wall, if it exists.

In the classic game, the player controls the snake in a bid to eat as many food items as possible to obtain a top score. In this application, we look at using Fuzzy Logic system to infer the next step the snake should make. Rules are used to control snake based on the location of the snake with the position of the food item and proximity to its own body in mind.

Here, is an image of the snake moving towards the food (Doge) where the multi colored pixel in the head of the snake.

Parameters to the game application

There are 2 parameters that the Snake game we have developed takes as inputs – the type of controller that is used to control the snake and the layout of obstacles that the snake needs to maneuver in the game arena. These parameters are described in detail below. We then describe the steps to install the dependencies requires to execute the application and then finally how to run after installing the dependencies.

Snake controllers

0. Manual controller - When the application is run with the controller specified as 0, then the snake is controlled by the manual press of up, down, left and right keys.
1. Crisp rules controller – When the snake is run with the controller specified as 1, then the crisp rules controller controls the snake. This is the baseline controller for all comparisons performed in the report.
2. Fuzzy rules controller – When the snake is run with the controller specified as 2, then the tuned Fuzzy rules defined controller is used to control the snake.
3. Fuzzy rules controller for bricks – When the snake is run with the controller as 3, then the Fuzzy rules are optimized such that the snake is better able to prevent collisions with bricks present in the arena.

Snake levels

0. No bricks level – When the level is specified as 0 there are no bricks present in the arena and the only way for the snake to die is a self-collision. This is the simplest level for the snake to maneuver.

1. Vertical bricks level – When the level is specified as 1 the bricks are laid out in a vertical pattern. If the snake collides with any brick in the brick wall, then it would perish and the game will be over.

2. Horizontal bricks level – When the level is specified as 2, the bricks are laid out in a horizontal pattern. The difficult of this level is the same as that of the earlier level.

3. L shaped bricks level – When the level is specified as 3, the bricks are laid out in an inverted L shaped pattern. This is the most difficult level for the snake to maneuver.

Installation of dependencies

Pre-requisites

• Python 3.6 or above
• Anaconda version 5.1.0 or above
• Windows OS
• Visual Studio C++ build tools to install scikit-fuzzy
• Latest pip installer

Installation process

• Navigate into the Snake game source code (src folder)
• Open a command prompt in the Administrator mode
• Create a conda environment called “fuzzygame”

• conda create --name fuzzygame python=3.6

• activate fuzzygame

• Find the requirements.txt file in the Snake game source code

• pip install -r requirements.txt

If the installation of the dependencies from the requirements.txt fails due to some reason, please install the packages mentioned in the requirements.txt using pip in the conda environment.

Sample runs

1. To run the snake game with the fuzzy controller and no bricks level the game needs to be invoked in the following way: python App.py 2 0

Here, 2 specifies the Fuzzy controller and 0 specifies the no bricks level as mentioned in the earlier sections.

2. To run the snake game with the fuzzy bricks controller and the L bricks level the command is as below: Python App.py 3 3

Here, the first 3 specifies the fuzzy bricks controller and the second 3 specifies the L shaped bricks layout as mentioned in the earlier sections.

Note: The Escape key can be pressed to stop the game execution at any time.

Complete Working game demo

Please find the working game demo here

References

Basic game source code taken from here: https://pythonspot.com/snake-with-pygame/