| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.52/5 | 4.33/5 |
| Vol 3-4 | 2.72/5 | 4.42/5 |
| Vol 5-6 | 2.42/5 | 4.22/5 |
| Vol 7-8 | 2.62/5 | 4.35/5 |
| Vol 9-10 | 3.17/5 | 4.48/5 |
| Vol 11-12 | 3.30/5 | 4.50/5 |
| Vol 13-14 | 2.71/5 | 4.41/5 |
| Vol 15-16 | 2.60/5 | 4.32/5 |
| Vol 17-18 | 2.82/5 | 4.45/5 |
| Vol 19-20 | 2.92/5 | 4.39/5 |
| Vol 21-22 | 3.02/5 | 4.42/5 |
| Vol 23-24 | 2.72/5 | 4.32/5 |
| Vol 25-26 | 2.65/5 | 4.35/5 |
| Vol 27-28 | 2.71/5 | 4.34/5 |
| Vol 29-30 | 2.57/5 | 4.29/5 |
| Vol 31-32 | 2.60/5 | 4.28/5 |
| Vol 33-34 | 2.77/5 | 4.36/5 |
| Overall | 2.74/5 | 4.50/5 |