An environmentally-friendly puzzle game, created for Ludum Dare 23
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Think Green is an environmentally-friendly puzzle game written using Python 2.7 and Pygame. See below for installation instructions.

Gameplay tips

  • Score points by neutralizing hazards.
  • Chain up recycles in front of receptors to get extra combo points!
  • Survive for as long as possible.


Think Green gameplay

Installing and running the game

To run Think Green, you need two thing installed:

  • Python 2.7 – Python is a general-purpose programming language. Python is installed by default on almost every Linux distribution, but if you use Windows or Mac OS you'll probably need to install it yourself. Just head on over to and grab the Python 2.7 installer for your operating system.

  • Pygame – Pygame is a library (pre-packaged code) that makes it easier to program games. If you use a Linux operating system, your distribution probably has a package for Pygame. If you're using Windows or Mac, head to and grab the correct installer for your operating system. (Make sure it's one that has "py2.7" in the filename.)

You can test whether Pygame is installed correctly by opening the Python interpreter and typing

>>> import pygame

If this doesn't print any errors, then you should be good to go.

Once you have Python 2.7 and Pygame installed, you need to obtain the Think Green game files. If you know how, just clone this repository. Otherwise, download a .zip archive of the repository using this link

and extract the files to an easy-to-access folder.

Run the game by executing with Python. On Linux or Mac OS, you can open a terminal, navigate to the folder containing, and type


On Windows, you can probably just double-click the file to run it.


This game and all included files (code, images) are copyright 2012 Colin Chan and released under the GNU General Public License. See for more information.

The included music files are released under a Creative Commons Attribution-ShareAlike 3.0 Unported License.