Achievement: Speed XII

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Speed XII

Finish a collection of 4k or higher with an avg. time of under 10 seconds.*

*The collection must contain at least 100 problems.

Recently completed by

MalikKarimov 6k, nepro 1k, StephaneLamy 1k, YuriyStepanovich 10d, Захарова Светлана 7k, Vic Beloshenco 7k, KoichiKai 4d, Dmitriy Vinogradov 3k, Pear08 4k, Incognito 3k

and 28 others.