| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.39/5 | 4.61/5 |
| Vol 3-4 | 2.82/5 | 4.66/5 |
| Vol 5-6 | 2.93/5 | 4.70/5 |
| Vol 7-8 | 3.08/5 | 4.73/5 |
| Vol 9-10 | 2.62/5 | 4.63/5 |
| Vol 11-12 | 2.77/5 | 4.61/5 |
| Vol 13-14 | 2.80/5 | 4.67/5 |
| Vol 15-16 | 3.23/5 | 4.73/5 |
| Vol 17-18 | 3.91/5 | 4.76/5 |
| Vol 19-20 | 3.61/5 | 4.75/5 |
| Vol 21-22 | 3.58/5 | 4.82/5 |
| Vol 23-24 | 3.01/5 | 4.69/5 |
| Vol 25-26 | 2.65/5 | 4.67/5 |
| Vol 27-28 | 3.01/5 | 4.69/5 |
| Vol 29-30 | 3.60/5 | 4.78/5 |
| Vol 31-32 | 4.21/5 | 4.78/5 |
| Vol 33-34 | 3.22/5 | 4.73/5 |
| Vol 35-36 | 3.77/5 | 4.78/5 |
| Vol 37-38 | 3.95/5 | 4.77/5 |
| Vol 39-40 | 3.47/5 | 4.77/5 |
| Vol 41-42 | 3.56/5 | 4.78/5 |
| Vol 43-44 | 3.64/5 | 4.73/5 |
| Vol 45 | 3.90/5 | 4.74/5 |
| Overall | 3.22/5 | 4.82/5 |