| 2500 |
| Solve |
| Jumping Man | 2500 | Solve |
| Jzzhu and Apples | 2500 | Solve |
| K-Set Tree | 2500 | Solve |
| Keen Tree Calculation | 2500 | Solve |
| Kefa and Watch | 2500 | Solve |
| Kevin and Math Class | 2500 | Solve |
| Khayyam's Royal Decree (Easy Version) | 2500 | Solve |
| King's Path | 2500 | Solve |
| Kingdom of Criticism | 2500 | Solve |
| Kuroni and the Punishment | 2500 | Solve |
| L BREAK into program | 2500 | Solve |
| LCM Sum (hard version) | 2500 | Solve |
| Laboratory on Pluto | 2500 | Solve |
| Last chance | 2500 | Solve |
| Leaf Partition | 2500 | Solve |
| Legen... | 2500 | Solve |
| Lena and Queries | 2500 | Solve |
| Levko and Strings | 2500 | Solve |
| Lexichromatography | 2500 | Solve |
| Library game | 2500 | Solve |
| Lift and Throw | 2500 | Solve |
| Little Elephant and Triangle | 2500 | Solve |
| Loader | 2500 | Solve |