I would like to thank Alisa Odincova for pointing out an error in the references for Even Ninja Monkeys Like to Play.
“[…] a word like “game” points to a somewhat diffuse “system” of prototype frames, among which some frame-shifts are easy, but others involve more strain”
Ludwig Wittgenstein
Marczewski, Andrzej (2015-10-12). Even Ninja Monkeys Like to Play: Gamification, Game Thinking & Motivational Design (Kindle Locations 357-359).
Gamified UK. Kindle Edition.
I referenced this as Wittgenstein, L. Philosophical Investigations. GEM Anscombe, (1953).
