Achievement: Solve a 1d problem

Solve a 1d problem

250 XP

Solve a 1d problem.

Recently completed by

Cosmic_Juice 3k, Julien Ketabi 1k, evilcat 2k, Айко Асида 3k, Ivan Tolmachev 5k, Guy Butler 6k, Ascense 1k, Harold Wang 4k, santiago rebolledo 1k, chmooze 5k

and 1963 others.