| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.73/5 | 4.58/5 |
| Vol 3-4 | 2.58/5 | 4.03/5 |
| Vol 5-6 | 2.60/5 | 4.35/5 |
| Vol 7-8 | 2.52/5 | 4.29/5 |
| Vol 9-10 | 2.43/5 | 3.94/5 |
| Vol 11-12 | 2.53/5 | 4.52/5 |
| Vol 13-14 | 2.74/5 | 4.38/5 |
| Vol 15-16 | 2.67/5 | 4.41/5 |
| Vol 17-18 | 2.84/5 | 4.41/5 |
| Vol 19-20 | 2.49/5 | 4.47/5 |
| Vol 21-22 | 2.35/5 | 4.35/5 |
| Vol 23-24 | 2.65/5 | 4.38/5 |
| Vol 25-26 | 2.69/5 | 4.41/5 |
| Vol 27-28 | 3.04/5 | 4.79/5 |
| Vol 29-30 | 2.74/5 | 4.44/5 |
| Vol 31-32 | 2.52/5 | 4.47/5 |
| Vol 33-34 | 3.06/5 | 4.73/5 |
| Vol 35-36 | 3.32/5 | 4.76/5 |
| Overall | 2.75/5 | 4.79/5 |