| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.87/5 | 4.66/5 |
| Vol 3-4 | 3.32/5 | 4.67/5 |
| Vol 5-6 | 2.90/5 | 4.61/5 |
| Vol 7-8 | 3.50/5 | 4.67/5 |
| Vol 9-10 | 4.03/5 | 4.71/5 |
| Vol 11-12 | 3.75/5 | 4.72/5 |
| Vol 13-14 | 4.16/5 | 4.74/5 |
| Vol 15-16 | 4.13/5 | 4.72/5 |
| Vol 17-18 | 4.36/5 | 4.81/5 |
| Vol 19-20 | 4.15/5 | 4.73/5 |
| Vol 21-22 | 4.16/5 | 4.73/5 |
| Vol 23-24 | 4.11/5 | 4.70/5 |
| Vol 25-26 | 4.28/5 | 4.79/5 |
| Vol 27-28 | 3.94/5 | 4.74/5 |
| Vol 29-30 | 4.20/5 | 4.74/5 |
| Vol 31-32 | 4.23/5 | 4.79/5 |
| Vol 33-34 | 4.26/5 | 4.78/5 |
| Vol 35 | 4.22/5 | 4.74/5 |
| Overall | 3.87/5 | 4.81/5 |