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

ÐŸÐ Ðž Ð ÐžÐœÐ 2k, Irina 8k, JohnSmithGo 2d, Sun Tzu 1d, MiPa15 2d, Алёна Киреева 8k, Coldgaze 6k, Thijs 5d, Kamilla10 3k, caranthir 1d

and 87 others.