| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.26/5 | 4.61/5 |
| Vol 3-4 | 2.69/5 | 4.50/5 |
| Vol 5-6 | 3.04/5 | 4.55/5 |
| Vol 7-8 | 2.88/5 | 4.55/5 |
| Vol 9-10 | 3.48/5 | 4.62/5 |
| Vol 11-12 | 3.34/5 | 4.60/5 |
| Vol 13-14 | 3.11/5 | 4.57/5 |
| Vol 15-16 | 3.12/5 | 4.56/5 |
| Vol 17-18 | 3.78/5 | 4.59/5 |
| Vol 19-20 | 3.10/5 | 4.55/5 |
| Vol 21-22 | 2.76/5 | 4.47/5 |
| Vol 23-24 | 2.83/5 | 4.46/5 |
| Vol 25-26 | 2.61/5 | 4.43/5 |
| Vol 27 | 4.04/5 | 4.62/5 |
| Overall | 3.13/5 | 4.62/5 |