| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.74/5 | 4.32/5 |
| Vol 3-4 | 3.15/5 | 4.48/5 |
| Vol 5-6 | 2.82/5 | 4.42/5 |
| Vol 7-8 | 2.85/5 | 4.41/5 |
| Vol 9-10 | 2.59/5 | 4.40/5 |
| Vol 11-12 | 2.69/5 | 4.39/5 |
| Vol 13-14 | 3.21/5 | 4.56/5 |
| Vol 15-16 | 3.02/5 | 4.51/5 |
| Vol 17-18 | 3.00/5 | 4.40/5 |
| Vol 19-20 | 2.78/5 | 4.39/5 |
| Vol 21-22 | 2.69/5 | 4.35/5 |
| Vol 23-24 | 3.08/5 | 4.57/5 |
| Vol 25-26 | 3.11/5 | 4.53/5 |
| Vol 27-28 | 3.07/5 | 4.50/5 |
| Vol 29-30 | 3.01/5 | 4.51/5 |
| Vol 31-32 | 3.14/5 | 4.44/5 |
| Vol 33-34 | 2.73/5 | 4.36/5 |
| Vol 35-36 | 2.75/5 | 4.39/5 |
| Vol 37-38 | 3.83/5 | 4.62/5 |
| Overall | 2.95/5 | 4.62/5 |