| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.16/5 | 4.00/5 |
| Vol 3-4 | 2.36/5 | 4.14/5 |
| Vol 5-6 | 2.56/5 | 4.36/5 |
| Vol 7-8 | 2.47/5 | 4.25/5 |
| Vol 9-10 | 2.46/5 | 4.14/5 |
| Vol 11-12 | 2.58/5 | 4.38/5 |
| Vol 13-14 | 2.45/5 | 4.32/5 |
| Vol 15-16 | 2.26/5 | 4.23/5 |
| Vol 17-18 | 2.45/5 | 4.35/5 |
| Vol 19-20 | 2.51/5 | 4.30/5 |
| Vol 21-22 | 2.62/5 | 4.46/5 |
| Vol 23-24 | 2.48/5 | 4.30/5 |
| Vol 25-26 | 2.62/5 | 4.35/5 |
| Vol 27-28 | 2.46/5 | 4.32/5 |
| Vol 29-30 | 2.42/5 | 4.21/5 |
| Vol 31-32 | 2.27/5 | 3.82/5 |
| Vol 33-34 | 2.38/5 | 4.12/5 |
| Vol 35 | 2.81/5 | 4.38/5 |
| Overall | 2.45/5 | 4.46/5 |