| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.98/5 | 4.61/5 |
| Vol 3-4 | 2.98/5 | 4.64/5 |
| Vol 5-6 | 3.56/5 | 4.71/5 |
| Vol 7-8 | 2.95/5 | 4.53/5 |
| Vol 9-10 | 3.34/5 | 4.72/5 |
| Vol 11-12 | 2.96/5 | 4.61/5 |
| Vol 13-14 | 2.90/5 | 4.49/5 |
| Vol 15-16 | 3.01/5 | 4.58/5 |
| Vol 17-18 | 2.92/5 | 4.52/5 |
| Vol 19-20 | 2.97/5 | 4.56/5 |
| Vol 21-22 | 3.74/5 | 4.75/5 |
| Vol 23-24 | 3.09/5 | 4.57/5 |
| Vol 25-26 | 3.50/5 | 4.71/5 |
| Vol 27-28 | 3.22/5 | 4.66/5 |
| Vol 29-30 | 3.13/5 | 4.69/5 |
| Vol 31-32 | 3.23/5 | 4.66/5 |
| Vol 33-34 | 3.37/5 | 4.73/5 |
| Vol 35-36 | 3.11/5 | 4.60/5 |
| Vol 37-38 | 3.50/5 | 4.71/5 |
| Vol 39-40 | 3.41/5 | 4.75/5 |
| Vol 41-42 | 3.59/5 | 4.74/5 |
| Vol 43 | 2.86/5 | 4.60/5 |
| Overall | 3.19/5 | 4.75/5 |