| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.62/5 | 4.43/5 |
| Vol 3-4 | 2.82/5 | 4.52/5 |
| Vol 5-6 | 2.52/5 | 4.32/5 |
| Vol 7-8 | 2.72/5 | 4.45/5 |
| Vol 9-10 | 3.23/5 | 4.58/5 |
| Vol 11-12 | 3.41/5 | 4.60/5 |
| Vol 13-14 | 2.82/5 | 4.51/5 |
| Vol 15-16 | 2.71/5 | 4.42/5 |
| Vol 17-18 | 2.90/5 | 4.55/5 |
| Vol 19-20 | 3.02/5 | 4.49/5 |
| Vol 21-22 | 3.10/5 | 4.52/5 |
| Vol 23-24 | 2.82/5 | 4.42/5 |
| Vol 25-26 | 2.74/5 | 4.45/5 |
| Vol 27-28 | 2.81/5 | 4.44/5 |
| Vol 29-30 | 2.68/5 | 4.39/5 |
| Vol 31-32 | 2.70/5 | 4.38/5 |
| Vol 33-34 | 2.86/5 | 4.46/5 |
| Overall | 2.85/5 | 4.60/5 |