| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.82/5 | 4.47/5 |
| Vol 3-4 | 2.85/5 | 4.49/5 |
| Vol 5-6 | 2.75/5 | 4.40/5 |
| Vol 7-8 | 2.62/5 | 4.36/5 |
| Vol 9-10 | 2.81/5 | 4.41/5 |
| Vol 11-12 | 2.87/5 | 4.42/5 |
| Vol 13-14 | 2.68/5 | 4.49/5 |
| Vol 15-16 | 2.60/5 | 4.21/5 |
| Vol 17-18 | 2.50/5 | 4.25/5 |
| Vol 19-20 | 2.52/5 | 4.03/5 |
| Vol 21-22 | 2.72/5 | 4.29/5 |
| Vol 23-24 | 2.61/5 | 4.35/5 |
| Vol 25-26 | 2.82/5 | 4.47/5 |
| Overall | 2.70/5 | 4.49/5 |