| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1 | 2.99/5 | 3.87/5 |
| Vol 2 | 3.19/5 | 3.84/5 |
| Vol 3 | 3.21/5 | 3.92/5 |
| Vol 4 | 3.29/5 | 3.96/5 |
| Vol 5 | 3.53/5 | 4.22/5 |
| Vol 6 | 3.05/5 | 3.85/5 |
| Vol 7 | 3.36/5 | 4.16/5 |
| Vol 8 | 3.25/5 | 4.10/5 |
| Vol 9 | 3.49/5 | 4.31/5 |
| Vol 10 | 3.22/5 | 4.06/5 |
| Vol 11 | 3.46/5 | 4.30/5 |
| Vol 12 | 3.44/5 | 4.27/5 |
| Vol 13 | 3.46/5 | 4.28/5 |
| Overall | 3.30/5 | 4.31/5 |