| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.72/5 | 4.62/5 |
| Vol 3-4 | 4.09/5 | 4.65/5 |
| Vol 5-6 | 3.54/5 | 4.63/5 |
| Vol 7-8 | 4.06/5 | 4.63/5 |
| Vol 9-10 | 3.36/5 | 4.64/5 |
| Vol 11-12 | 2.82/5 | 4.54/5 |
| Vol 13-14 | 3.77/5 | 4.64/5 |
| Vol 15-16 | 4.10/5 | 4.64/5 |
| Vol 17-18 | 3.82/5 | 4.66/5 |
| Vol 19-20 | 3.52/5 | 4.64/5 |
| Vol 21-22 | 3.84/5 | 4.62/5 |
| Vol 23-24 | 4.07/5 | 4.63/5 |
| Vol 25-26 | 3.52/5 | 4.65/5 |
| Vol 27 | 2.87/5 | 4.53/5 |
| Overall | 3.68/5 | 4.66/5 |