Achievement: Speed X

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Speed X

Finish a collection of 4k or higher with an avg. time of under 30 seconds.*

*The collection must contain at least 100 problems.

Recently completed by

Babaykago 4k, Ming Au 1d, Jérôme Riou 1k, Галя 5k, Irina 8k, Bibigul Arzybaeva 2k, Louise Roullier 3k, Met 1k, SofiaQu 2k, Sun Tzu 1d

and 151 others.