6 problems
| ID | Problem | Difficulty | Accepted | Solved | Status |
|---|---|---|---|---|---|
| 421 | 실 자르기threadcutting | Unrated | 18% | 8 | Not tried |
| 422 | 합류 경보mergealarm | Unrated | 68% | 13 | Not tried |
| 423 | 붉은 절단redcut | Unrated | 40% | 4 | Not tried |
| 424 | 점멸 점검blinkinspection | Unrated | 29% | 2 | Not tried |
| 460 | 일회용 스위치oneuseswitch | Unrated | 38% | 3 | Not tried |
| 647 | 도장stamp | Unrated | 0% | 0 | Not tried |
