Achievement: Solve a 4d problem
Solve a 4d problem
700 XP
Solve a 4d problem.
325 users completed this achievement.
Completed by
Anastasia Atyakova, WhiteSpy, Higaki, 
CRP ICIE, 
Amy Song, Korablik, 
o x, oleg_shalopai, 
david prieto, Revelation and more.
