Decide on 1-3 player experiences.
What do you want your players to feel, do, and think?
Create your game with as few elements as possible.
Create your prototype in an entirely physical environment.
Do the systems work? Is the core loop strong?
Present your Physical Prototype to other designers, players, and testers.
Demonstrate how your game works. Define core actions.
Communicate your expected player experiences.
Did your fellow designers, players, and testers share the same experience?
Write & design more formal rule sets for your game.
Create goals and expectations for yourself and your team members for producing your game.
Who is responsible for what?
What is the production timeline?
What are your expectations?
How will you hold each other accountable?
Fullerton, T., Swain, C., & Hoffman, S. (2014). Game design workshop: A playcentric approach to creating innovative games. Amsterdam: Elsevier Morgan Kaufmann.