| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.74/5 | 4.32/5 |
| Vol 3-4 | 3.02/5 | 4.53/5 |
| Vol 5-6 | 2.78/5 | 4.40/5 |
| Vol 7-8 | 2.90/5 | 4.52/5 |
| Vol 9-10 | 3.18/5 | 4.49/5 |
| Vol 11-12 | 3.51/5 | 4.55/5 |
| Vol 13-14 | 3.76/5 | 4.59/5 |
| Vol 15-16 | 3.38/5 | 4.56/5 |
| Vol 17-18 | 3.23/5 | 4.55/5 |
| Vol 19-20 | 2.98/5 | 4.49/5 |
| Vol 21-22 | 3.44/5 | 4.58/5 |
| Vol 23-24 | 2.97/5 | 4.47/5 |
| Vol 25-26 | 3.24/5 | 4.55/5 |
| Overall | 3.16/5 | 4.59/5 |