| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.56/5 | 4.43/5 |
| Vol 3-4 | 2.64/5 | 4.35/5 |
| Vol 5-6 | 2.76/5 | 4.47/5 |
| Vol 7-8 | 3.10/5 | 4.50/5 |
| Vol 9-10 | 2.89/5 | 4.48/5 |
| Vol 11-12 | 4.02/5 | 4.62/5 |
| Vol 13-14 | 3.48/5 | 4.57/5 |
| Vol 15-16 | 3.40/5 | 4.54/5 |
| Vol 17-18 | 3.79/5 | 4.59/5 |
| Vol 19-20 | 3.73/5 | 4.59/5 |
| Vol 21-22 | 4.02/5 | 4.64/5 |
| Vol 23-24 | 3.69/5 | 4.62/5 |
| Vol 25-26 | 4.10/5 | 4.66/5 |
| Vol 27-28 | 4.20/5 | 4.69/5 |
| Vol 29-30 | 4.20/5 | 4.70/5 |
| Vol 31-32 | 3.86/5 | 4.61/5 |
| Vol 33-34 | 4.02/5 | 4.62/5 |
| Vol 35-36 | 4.14/5 | 4.68/5 |
| Vol 37-38 | 4.21/5 | 4.70/5 |
| Overall | 3.62/5 | 4.70/5 |