Another amazing video. The thing that really made me think ironically doesn't have anything to do with puzzle games, but the comparison Sakurai-san makes at the start with "puzzles" themselves, such as jigsaw puzzles. As someone who designs custom Lego creations, the statement that "the fun comes from the achievement of putting them together" is insightful. It makes me think of how "risk and reward" could be applied to such a concept, and why it is generally marketed as a "relaxing activity" more so than a "challenge". Hypothetically, you could say the entire process is one large "push and pull", as the desire to see the finished product grows and grows (stresses) with time, finally releasing as the puzzle is completed. There are, however, other ways, I think, of integrating "push and pull" into these types of activities. Though the official Lego company stresses the importance of product stability (which is important), some fan designs use less conventional techniques which are either a bit more fragile or "difficult" to put together. Through this, I think there can definitely be a "risk and reward". Without finding the right way to put together the pieces with just the right amount of precision, we have a "risk" of the whole section breaking from too much force being applied. Execute successfully, and we have the "reward" of greater detail in the finished model.