| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.57/5 | 4.57/5 |
| Vol 3-4 | 3.43/5 | 4.54/5 |
| Vol 5-6 | 4.06/5 | 4.64/5 |
| Vol 7-8 | 4.09/5 | 4.64/5 |
| Vol 9-10 | 4.10/5 | 4.66/5 |
| Vol 11-12 | 3.66/5 | 4.58/5 |
| Vol 13-14 | 3.73/5 | 4.58/5 |
| Vol 15-16 | 3.45/5 | 4.60/5 |
| Vol 17-18 | 4.06/5 | 4.65/5 |
| Vol 19-20 | 3.96/5 | 4.64/5 |
| Vol 21-22 | 3.66/5 | 4.61/5 |
| Vol 23-24 | 4.13/5 | 4.66/5 |
| Vol 25-26 | 3.87/5 | 4.62/5 |
| Vol 27-28 | 3.98/5 | 4.67/5 |
| Vol 29-30 | 4.18/5 | 4.67/5 |
| Vol 31-32 | 4.24/5 | 4.71/5 |
| Vol 33-34 | 4.13/5 | 4.69/5 |
| Vol 35-36 | 4.12/5 | 4.66/5 |
| Vol 37-38 | 4.11/5 | 4.66/5 |
| Vol 39-40 | 3.90/5 | 4.62/5 |
| Vol 41-42 | 4.12/5 | 4.65/5 |
| Overall | 3.96/5 | 4.71/5 |