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They only way to define this "as is" as a game is to define art as a game, where the win condition is a completed piece, and the fail state is any happy mistake that happens thanks to how the paint guns work. I doubt many people would reach that far just to define it as a game though, I might if there was any other interaction besides just painting.

Overall, this is a good experience - you can define it as you want. Thank you for the answer. I wish you the best. Bye ++