| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.10/5 | 4.56/5 |
| Vol 3-4 | 3.49/5 | 4.57/5 |
| Vol 5-6 | 3.05/5 | 4.49/5 |
| Vol 7-8 | 2.96/5 | 4.52/5 |
| Vol 9-10 | 3.08/5 | 4.54/5 |
| Vol 11-12 | 2.96/5 | 4.47/5 |
| Vol 13-14 | 2.72/5 | 4.41/5 |
| Vol 15-16 | 3.20/5 | 4.52/5 |
| Vol 17-18 | 2.92/5 | 4.49/5 |
| Vol 19-20 | 2.98/5 | 4.48/5 |
| Vol 21-22 | 2.84/5 | 4.44/5 |
| Vol 23-24 | 3.00/5 | 4.49/5 |
| Vol 25-26 | 2.74/5 | 4.41/5 |
| Vol 27-28 | 3.04/5 | 4.43/5 |
| Vol 29-30 | 3.18/5 | 4.49/5 |
| Vol 31-32 | 2.76/5 | 4.47/5 |
| Vol 33 | 2.84/5 | 4.44/5 |
| Overall | 3.00/5 | 4.57/5 |