| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.66/5 | 3.80/5 |
| Vol 3-4 | 2.68/5 | 3.78/5 |
| Vol 5-6 | 2.59/5 | 3.73/5 |
| Vol 7-8 | 2.66/5 | 3.86/5 |
| Vol 9-10 | 2.66/5 | 3.85/5 |
| Vol 11-12 | 2.61/5 | 3.80/5 |
| Vol 13-14 | 2.82/5 | 3.94/5 |
| Vol 15-16 | 2.73/5 | 3.94/5 |
| Vol 17-18 | 2.63/5 | 3.71/5 |
| Vol 19-20 | 2.66/5 | 3.84/5 |
| Vol 21-22 | 2.73/5 | 3.86/5 |
| Vol 23-24 | 2.70/5 | 3.85/5 |
| Vol 25-26 | 2.75/5 | 3.90/5 |
| Vol 27-28 | 2.74/5 | 3.92/5 |
| Vol 29 | 2.70/5 | 3.78/5 |
| Overall | 2.69/5 | 3.94/5 |