| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1 | 2.82/5 | 3.70/5 |
| Vol 2 | 3.02/5 | 3.67/5 |
| Vol 3 | 3.04/5 | 3.75/5 |
| Vol 4 | 3.12/5 | 3.79/5 |
| Vol 5 | 3.36/5 | 4.05/5 |
| Vol 6 | 2.88/5 | 3.68/5 |
| Vol 7 | 3.19/5 | 3.99/5 |
| Vol 8 | 3.08/5 | 3.93/5 |
| Vol 9 | 3.32/5 | 4.14/5 |
| Vol 10 | 3.05/5 | 3.89/5 |
| Vol 11 | 3.29/5 | 4.13/5 |
| Vol 12 | 3.27/5 | 4.10/5 |
| Vol 13 | 3.29/5 | 4.11/5 |
| Overall | 3.13/5 | 4.14/5 |