| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.53/5 | 4.36/5 |
| Vol 3-4 | 2.78/5 | 4.48/5 |
| Vol 5-6 | 2.81/5 | 4.44/5 |
| Vol 7-8 | 2.89/5 | 4.48/5 |
| Vol 9-10 | 2.77/5 | 4.39/5 |
| Vol 11-12 | 2.76/5 | 4.33/5 |
| Vol 13-14 | 2.74/5 | 4.33/5 |
| Vol 15-16 | 2.78/5 | 4.49/5 |
| Vol 17-18 | 2.83/5 | 4.43/5 |
| Vol 19-20 | 2.94/5 | 4.50/5 |
| Vol 21-22 | 3.01/5 | 4.48/5 |
| Vol 23-24 | 2.89/5 | 4.38/5 |
| Vol 25-26 | 2.94/5 | 4.54/5 |
| Overall | 2.82/5 | 4.54/5 |