| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1 | 2.87/5 | 3.89/5 |
| Vol 2 | 2.79/5 | 3.82/5 |
| Vol 3 | 3.04/5 | 3.93/5 |
| Vol 4 | 3.18/5 | 3.93/5 |
| Vol 5 | 3.18/5 | 3.99/5 |
| Vol 6 | 3.18/5 | 4.01/5 |
| Vol 7 | 3.14/5 | 3.98/5 |
| Vol 8 | 3.04/5 | 3.90/5 |
| Vol 9 | 3.38/5 | 4.29/5 |
| Vol 10 | 3.33/5 | 4.26/5 |
| Vol 11 | 3.41/5 | 4.34/5 |
| Vol 12 | 3.15/5 | 4.12/5 |
| Vol 13 | 3.24/5 | 4.02/5 |
| Overall | 3.16/5 | 4.34/5 |