Centers of one side
CENTERS_OF_ONE_SIDE86.6%

Achievements and their recorded unlock rates.
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CENTERS_OF_ONE_SIDECENTERS_AND_EDGES_OF_ONE_SIDEALL_CENTERS_AND_EDGESALL_CENTERSTWO_LAYERSCENTERS_AND_EDGES_OF_TWO_LAYERSCENTERS_OF_TWO_LAYERSONE_SIDEWHOLE_CUBE