| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.52/5 | 4.33/5 |
| Vol 3-4 | 2.62/5 | 4.25/5 |
| Vol 5-6 | 2.58/5 | 4.12/5 |
| Vol 7-8 | 2.62/5 | 4.32/5 |
| Vol 9-10 | 2.53/5 | 4.23/5 |
| Vol 11-12 | 2.72/5 | 4.25/5 |
| Vol 13-14 | 2.82/5 | 4.38/5 |
| Vol 15-16 | 2.76/5 | 4.30/5 |
| Vol 17-18 | 2.84/5 | 4.33/5 |
| Vol 19-20 | 2.78/5 | 4.32/5 |
| Vol 21-22 | 2.69/5 | 4.29/5 |
| Vol 23-24 | 2.78/5 | 4.30/5 |
| Vol 25-26 | 2.76/5 | 4.38/5 |
| Vol 27-28 | 2.86/5 | 4.49/5 |
| Vol 29-30 | 2.90/5 | 4.50/5 |
| Vol 31-32 | 2.68/5 | 4.19/5 |
| Overall | 2.72/5 | 4.50/5 |