| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.97/5 | 4.39/5 |
| Vol 3-4 | 2.92/5 | 4.12/5 |
| Vol 5-6 | 2.87/5 | 4.22/5 |
| Vol 7-8 | 2.88/5 | 4.46/5 |
| Vol 9-10 | 3.00/5 | 4.52/5 |
| Vol 11-12 | 2.92/5 | 4.50/5 |
| Vol 13-14 | 2.95/5 | 4.50/5 |
| Vol 15-16 | 3.06/5 | 4.46/5 |
| Vol 17-18 | 2.96/5 | 4.33/5 |
| Vol 19-20 | 3.25/5 | 4.65/5 |
| Vol 21-22 | 3.09/5 | 4.62/5 |
| Vol 23-24 | 3.23/5 | 4.62/5 |
| Vol 25-26 | 3.17/5 | 4.57/5 |
| Vol 27-28 | 3.00/5 | 4.46/5 |
| Vol 29-30 | 3.18/5 | 4.67/5 |
| Vol 31-32 | 3.02/5 | 4.56/5 |
| Vol 33-34 | 3.16/5 | 4.54/5 |
| Vol 35-36 | 3.17/5 | 4.66/5 |
| Vol 37-38 | 3.15/5 | 4.48/5 |
| Vol 39-40 | 3.02/5 | 4.46/5 |
| Vol 41-42 | 3.14/5 | 4.41/5 |
| Vol 43-44 | 3.13/5 | 4.62/5 |
| Vol 45-46 | 3.14/5 | 4.57/5 |
| Overall | 3.05/5 | 4.67/5 |