| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.68/5 | 4.45/5 |
| Vol 3-4 | 2.50/5 | 4.29/5 |
| Vol 5-6 | 2.54/5 | 4.33/5 |
| Vol 7-8 | 2.75/5 | 4.36/5 |
| Vol 9-10 | 2.73/5 | 4.43/5 |
| Vol 11-12 | 2.91/5 | 4.43/5 |
| Vol 13-14 | 2.62/5 | 4.40/5 |
| Vol 15-16 | 2.77/5 | 4.41/5 |
| Vol 17-18 | 2.72/5 | 4.46/5 |
| Vol 19-20 | 2.70/5 | 4.41/5 |
| Vol 21-22 | 2.82/5 | 4.40/5 |
| Vol 23-24 | 2.92/5 | 4.49/5 |
| Vol 25-26 | 2.82/5 | 4.41/5 |
| Vol 27-28 | 2.91/5 | 4.46/5 |
| Vol 29-30 | 2.96/5 | 4.44/5 |
| Vol 31-32 | 2.80/5 | 4.49/5 |
| Vol 33-34 | 2.75/5 | 4.38/5 |
| Vol 35-36 | 2.70/5 | 4.43/5 |
| Overall | 2.75/5 | 4.49/5 |