How Well You Know Rubik Cube

The 3x3 cube is the most popular cube because it is the standard and most well-known cube. It is the original Rubik's cube and has been around for a long time, gaining a large following and popularity. It is also the most widely available cube, making it accessible to a larger number of people. Additionally, the 3x3 cube is often considered the most challenging and rewarding to solve, which adds to its appeal and popularity.

Based on the given information, the correct answer is Japan because the name "yu nakajim" is a common Japanese name and it is likely that the person is from Japan.

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In a WCA (World Cube Association) competition, if a piece pops out of the puzzle during a solve, the competitor has two options: they can either choose to take a DNF (Did Not Finish) for that solve or they can continue solving with the popped piece. This decision is up to the competitor and depends on their strategy and confidence in completing the solve without the missing piece. Restarting the solve is not necessary or required in this situation.

The answer 7.08 is the closest to the question "what is the rubik cube 3x3 world record", which implies that it is the fastest time ever recorded for solving a 3x3 Rubik's Cube.

Erik Akkersdijk holds the 3x3 World Record.

The petaminx is considered the biggest twisty puzzle among the options given. It is a dodecahedron-shaped puzzle that consists of 12 layers, with each layer having 5 faces. The puzzle has a total of 975 individual pieces, making it extremely challenging and complex to solve. The V Cube 7 and gigaminx are also large twisty puzzles, but the petaminx surpasses them in terms of size and difficulty. The 9x9 is not a specific puzzle name, but rather refers to the size of a puzzle, so it is not the correct answer.

The correct answer is DIY because it suggests that a 3x3 that can adjust tension can be made by oneself rather than being purchased from a store. This implies that the tension adjustment feature is not commonly found in commercially available 3x3 puzzles and requires a do-it-yourself approach to incorporate it.

The correct answer is "store bought" because it refers to a Rubik's cube that is purchased from a store rather than being homemade or DIY. The other options, such as "DIY," "magic cube," and "Rubik cube," do not accurately describe the brand of Rubik's cube, whereas "store bought" specifically indicates that it is a commercially available product.