Achievement: Speed XI

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Speed XI

Finish a collection of 4k or higher with an avg. time of under 20 seconds.*

*The collection must contain at least 100 problems.

Recently completed by

caranthir 1d, MalikKarimov 6k, mehmeh 11k, Yarosurabu 3k, Tschej 1d, d4rkm4tter 3d, Mrmaaay 1k, nepro 1k, ValeriiGo 1k, Patrick361 1k

and 78 others.