"Arthropod" is the name of level Advanced 30 in Super Monkey Ball 2, and is the first truly challenging level in the game. It always takes several attempts, at least, to complete no matter how well you know the game, unless you resort to pause timing or luck out. It looks exactly like the kind of level that would have some devious trick that, once discovered, makes it a snap. Only this time, there is no trick. Unlike "Triangle Holes," which looks almost impossible until you try simply holding up from the start, at which time you watch in disbelief as the ball uncannily bounces right through the goal, you actually do have to figure out a way past this one.
Better yet, the level looks challenging. If you have a friend who derides your game collection as wimpy because you have a game featuring monkeys in plastic balls chanting "Ei-Ei-Poo," he'll stop laughing once he sees you complete Arthropod. The level is four huge rotating drums with a giant... thing walking on top of them. The goal gate is rotating on the outer surface of the furthest drum. Each drum is fairly wide, but there is enough space between them that if you end up at rest on top of any one you're done for, as there is no way to build enough speed to hop to the next drum from a standstill.
The way this one is solved is, from the starting platform, build up as much speed as you can and plunge across the drums, trusting to the fates to keep you out of the abyss, all the while trying to adjust your trajectory to avoid the great swinging legs of the Arthropod itself intersecting your path, and aiming for the middle of the goal on that last drum, in motion itself. In fact, since the goal starts on top of the ring and is hopelessly out of reach by the time you could to it, you always have to wait for about twenty seconds at the start of the level for it to come back around before you start your roll. Add up judging the time it takes to reach the goal, aiming for the tape, dodging legs, and trying not to bounce so high as to sail completely over the goal, oh, and not forgetting to make sure you don't get rolled off the drums themselves, and you have a first class challenge worthy of the name "Super Monkey Ball." And that, dear reader, is strong language.