People who solve Rubik's cubes, especially those who compete in speedcubing competitions where they race against the clock.
Formed from 'cube' (Latin 'cubus,' from Greek 'kubos') plus the agent suffix '-er' and plural '-s.' The term became common only after the Rubik's Cube craze of the 1980s.
Competitive cubers today solve a scrambled Rubik's cube in under 5 seconds—the world record is below 3.5 seconds—which requires memorizing dozens of move sequences and finger dexterity that rivals concert pianists.
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