Christmas Gift (2022) Earn at least 5 gifts from the Make a Tree event, 2022
725
Newbie Problem-solver Solve 10 problems
149K
Beginner Problem-solver Solve 50 problems
103K
Apprentice Problem-solver Solve 100 problems
65K
Skilled Problem-solver Solve 200 problems
31K
Professional Problem-solver Solve 500 problems
6.4K
Boardgame Cup (2023) Solved 1 or more problems in Boardgame Cup
584
The 2nd MatKor Cup : 2023 Winter Participated in the 2nd MatKor Cup, or solved 1 or more problems in its open contest
473
2023 Chung-Ang University CHAC Participated in 2023 Chung-Ang University CHAC, or achieved a score of over 10 in its open contest
341
A yellow badge with a blue ribbon that seems to fit somewhere (2023) Solved a problem with ‘41’ in its ID, between 6:00 AM April 1, 2023 KST and 1:00 AM April 3, 2023 KST