| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.58/5 | 3.74/5 |
| Vol 3-4 | 2.55/5 | 3.77/5 |
| Vol 5-6 | 2.47/5 | 3.78/5 |
| Vol 7-8 | 2.66/5 | 3.78/5 |
| Vol 9-10 | 2.33/5 | 3.64/5 |
| Vol 11-12 | 2.07/5 | 3.52/5 |
| Vol 13-14 | 2.39/5 | 3.71/5 |
| Vol 15-16 | 2.05/5 | 3.70/5 |
| Vol 17-18 | 2.59/5 | 3.91/5 |
| Vol 19-20 | 2.35/5 | 3.68/5 |
| Vol 21-22 | 2.68/5 | 3.80/5 |
| Vol 23-24 | 2.17/5 | 3.89/5 |
| Vol 25-26 | 2.68/5 | 4.07/5 |
| Overall | 2.42/5 | 4.07/5 |