| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.80/5 | 4.57/5 |
| Vol 3-4 | 3.23/5 | 4.58/5 |
| Vol 5-6 | 2.82/5 | 4.52/5 |
| Vol 7-8 | 3.46/5 | 4.58/5 |
| Vol 9-10 | 3.92/5 | 4.62/5 |
| Vol 11-12 | 3.66/5 | 4.63/5 |
| Vol 13-14 | 4.06/5 | 4.65/5 |
| Vol 15-16 | 4.04/5 | 4.63/5 |
| Vol 17-18 | 4.27/5 | 4.72/5 |
| Vol 19-20 | 4.06/5 | 4.64/5 |
| Vol 21-22 | 4.07/5 | 4.64/5 |
| Vol 23-24 | 4.02/5 | 4.61/5 |
| Vol 25-26 | 4.18/5 | 4.70/5 |
| Vol 27-28 | 3.83/5 | 4.65/5 |
| Vol 29-30 | 4.11/5 | 4.65/5 |
| Vol 31-32 | 4.14/5 | 4.70/5 |
| Vol 33-34 | 4.16/5 | 4.69/5 |
| Vol 35 | 4.13/5 | 4.65/5 |
| Overall | 3.82/5 | 4.72/5 |