| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1 | 2.74/5 | 4.13/5 |
| Vol 2 | 2.47/5 | 4.31/5 |
| Vol 3 | 3.02/5 | 4.36/5 |
| Vol 4 | 2.83/5 | 4.36/5 |
| Vol 5 | 2.92/5 | 4.50/5 |
| Vol 6 | 2.99/5 | 4.56/5 |
| Vol 7 | 2.97/5 | 4.34/5 |
| Vol 8 | 2.88/5 | 4.26/5 |
| Vol 9 | 2.90/5 | 4.19/5 |
| Vol 10 | 2.70/5 | 4.10/5 |
| Vol 11 | 3.11/5 | 4.46/5 |
| Vol 12 | 3.07/5 | 4.47/5 |
| Vol 13 | 2.74/5 | 3.91/5 |
| Vol 14 | 3.03/5 | 4.19/5 |
| Vol 15 | 3.01/5 | 4.39/5 |
| Overall | 2.90/5 | 4.56/5 |