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][oT@Bi4's achievement

Speed XII

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

Rare

*The collection must contain at least 100 problems.

Recently completed by

Oleg Moiseev 2k,

Bibigul Arzybaeva 1k,

Алёна Киреева 4k,

MalikKarimov 2k,

StephaneLamy 1d,

YuriyStepanovich 11d,

Захарова Светлана 14k

and 32 others.