| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.38/5 | 4.23/5 |
| Vol 3-4 | 2.22/5 | 3.68/5 |
| Vol 5-6 | 2.24/5 | 4.00/5 |
| Vol 7-8 | 2.16/5 | 3.94/5 |
| Vol 9-10 | 2.08/5 | 3.59/5 |
| Vol 11-12 | 2.16/5 | 4.17/5 |
| Vol 13-14 | 2.39/5 | 4.03/5 |
| Vol 15-16 | 2.32/5 | 4.06/5 |
| Vol 17-18 | 2.49/5 | 4.06/5 |
| Vol 19-20 | 2.13/5 | 4.12/5 |
| Vol 21-22 | 2.00/5 | 4.00/5 |
| Vol 23-24 | 2.30/5 | 4.03/5 |
| Vol 25-26 | 2.34/5 | 4.06/5 |
| Vol 27-28 | 2.55/5 | 4.44/5 |
| Vol 29-30 | 2.38/5 | 4.09/5 |
| Vol 31-32 | 2.16/5 | 4.12/5 |
| Vol 33-34 | 2.63/5 | 4.38/5 |
| Vol 35-36 | 2.97/5 | 4.41/5 |
| Overall | 2.33/5 | 4.44/5 |