| English | Russian |
| puzzle one's brain about a problem | ломать себе голову над проблемой (one's head over a question, oneself over the matter, etc., и т.д.) |
| puzzle one's brain upon a problem | ломать себе голову над проблемой (one's head over a question, oneself over the matter, etc., и т.д.) |
| puzzling problem | головоломная задача |