speedcuber

From speedcube +‎ -er.

speedcuber (plural speedcubers)

1. A participant in the game of speedcubing, or solving a Rubik's cube as quickly as possible
   • 2007 October 4, Mike Peake, “Rubik's Cube: Quick-drawing sidewinder squares up for a cubic feat”, in Daily Telegraph‎^[1]:

     Dan Harris, 22, is the fastest speedcuber in Britain, which means he can complete the Rubik's Cube in just over 10 seconds.