| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.82/5 | 4.49/5 |
| Vol 3-4 | 3.03/5 | 4.51/5 |
| Vol 5-6 | 4.04/5 | 4.62/5 |
| Vol 7-8 | 4.02/5 | 4.62/5 |
| Vol 9-10 | 3.16/5 | 4.57/5 |
| Vol 11-12 | 3.08/5 | 4.53/5 |
| Vol 13-14 | 3.85/5 | 4.62/5 |
| Vol 15-16 | 2.88/5 | 4.51/5 |
| Vol 17-18 | 2.88/5 | 4.51/5 |
| Vol 19-20 | 3.40/5 | 4.60/5 |
| Vol 21-22 | 3.01/5 | 4.49/5 |
| Vol 23-24 | 2.70/5 | 4.40/5 |
| Vol 25-26 | 2.82/5 | 4.44/5 |
| Vol 27-28 | 2.73/5 | 4.47/5 |
| Vol 29-30 | 2.74/5 | 4.46/5 |
| Vol 31 | 2.90/5 | 4.55/5 |
| Overall | 3.14/5 | 4.62/5 |