Here are three interesting recent video game Master and PhD theses for your theoretical enjoyment.
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Jason Begy’s (my former research assistant at GAMBIT) Comparative Media Studies thesis:
Interpreting Abstract Games: The Metaphorical Potential of Formal Game Elements
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Petri Lankoski’s PhD thesis, Aalto University:
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Mirjam Palosaari Eladhari’s PhD thesis, Teeside University:
Characterising Action Potential in Virtual Game Worlds Applied with the Mind Module