| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 4.17/5 | 4.70/5 |
| Vol 3-4 | 4.05/5 | 4.64/5 |
| Vol 5-6 | 3.71/5 | 4.63/5 |
| Vol 7-8 | 4.21/5 | 4.70/5 |
| Vol 9-10 | 3.99/5 | 4.65/5 |
| Vol 11-12 | 4.14/5 | 4.67/5 |
| Vol 13-14 | 4.13/5 | 4.66/5 |
| Vol 15-16 | 3.86/5 | 4.65/5 |
| Vol 17-18 | 3.60/5 | 4.60/5 |
| Vol 19-20 | 3.93/5 | 4.60/5 |
| Vol 21-22 | 3.63/5 | 4.62/5 |
| Vol 23-24 | 3.82/5 | 4.63/5 |
| Vol 25-26 | 4.01/5 | 4.61/5 |
| Vol 27-28 | 3.86/5 | 4.68/5 |
| Vol 29-30 | 4.18/5 | 4.71/5 |
| Vol 31-32 | 4.05/5 | 4.63/5 |
| Vol 33-34 | 4.14/5 | 4.67/5 |
| Vol 35-36 | 3.97/5 | 4.61/5 |
| Vol 37-38 | 4.13/5 | 4.66/5 |
| Vol 39-40 | 3.62/5 | 4.63/5 |
| Vol 41 | 4.22/5 | 4.69/5 |
| Overall | 3.95/5 | 4.71/5 |