In this post however, I'd like to point your attention at an app for iPhone and Android which the author and have team has created and that is available FOR FREE!
The app is a collection of cards (called "lenses") which focus on one particular aspect of game design. The cards make you think about your game idea and refine certain areas.
Here's an example of one "lens" through which you can have a look at your game:

Of course it would be overkill to read through all of the 70+ lenses and try to consider them for your game. However, picking out a few ones and reading through them can open up new perspectives.
Link to iPhone app: http://itunes.apple....ses/id385531319
Link to Android app: https://play.google....es.deckoflenses












