| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1 | 3.20/5 | 4.01/5 |
| Vol 2 | 3.29/5 | 3.95/5 |
| Vol 3 | 3.24/5 | 4.11/5 |
| Vol 4 | 3.27/5 | 3.98/5 |
| Vol 5 | 3.40/5 | 4.16/5 |
| Vol 6 | 3.55/5 | 4.39/5 |
| Vol 7 | 3.34/5 | 4.13/5 |
| Vol 8 | 3.40/5 | 4.21/5 |
| Vol 9 | 3.35/5 | 4.00/5 |
| Vol 10 | 3.30/5 | 4.15/5 |
| Vol 11 | 3.48/5 | 4.31/5 |
| Vol 12 | 3.52/5 | 4.35/5 |
| Vol 13 | 3.36/5 | 4.16/5 |
| Vol 14 | 3.43/5 | 4.31/5 |
| Vol 15 | 3.39/5 | 4.08/5 |
| Overall | 3.37/5 | 4.39/5 |