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my best 3x3x3 has black rubik's pieces and green type D center pieces. it looks basically like a black cube with green centers. is this legal in competition? only the centers are distinguished...

i just got an eastsheen 4x4x4 about a week ago, and i've noticed that it does lock up a bit, and i'm worried that it will gradually lock up more and more over time. i'm wondering what the most efficient way of keeping it from locking up *less* is. i've losened the screws a bit, but i'm afraid to...