| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.38/5 | 4.52/5 |
| Vol 3-4 | 2.41/5 | 4.35/5 |
| Vol 5-6 | 2.70/5 | 4.65/5 |
| Vol 7-8 | 2.73/5 | 4.58/5 |
| Vol 9-10 | 3.03/5 | 4.62/5 |
| Vol 11-12 | 2.78/5 | 4.47/5 |
| Vol 13-14 | 2.87/5 | 4.58/5 |
| Vol 15-16 | 3.00/5 | 4.66/5 |
| Vol 17-18 | 2.61/5 | 4.52/5 |
| Vol 19-20 | 2.92/5 | 4.65/5 |
| Vol 21-22 | 2.48/5 | 4.48/5 |
| Vol 23-24 | 2.69/5 | 4.58/5 |
| Vol 25-26 | 2.75/5 | 4.56/5 |
| Vol 27-28 | 2.95/5 | 4.65/5 |
| Vol 29-30 | 2.68/5 | 4.58/5 |
| Vol 31-32 | 2.55/5 | 4.43/5 |
| Overall | 2.73/5 | 4.66/5 |