| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.30/5 | 4.14/5 |
| Vol 3-4 | 2.65/5 | 4.44/5 |
| Vol 5-6 | 2.28/5 | 4.19/5 |
| Vol 7-8 | 2.44/5 | 4.23/5 |
| Vol 9-10 | 2.54/5 | 4.33/5 |
| Vol 11-12 | 2.50/5 | 4.27/5 |
| Vol 13-14 | 2.50/5 | 4.20/5 |
| Vol 15-16 | 2.36/5 | 4.12/5 |
| Vol 17-18 | 2.65/5 | 4.36/5 |
| Vol 19-20 | 2.44/5 | 4.25/5 |
| Vol 21-22 | 2.78/5 | 4.44/5 |
| Vol 23-24 | 2.51/5 | 4.19/5 |
| Vol 25-26 | 2.52/5 | 4.32/5 |
| Vol 27-28 | 2.55/5 | 4.19/5 |
| Vol 29-30 | 2.73/5 | 4.41/5 |
| Vol 31 | 2.38/5 | 4.13/5 |
| Overall | 2.51/5 | 4.44/5 |