| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1 | 2.40/5 | 3.84/5 |
| Vol 2 | 2.59/5 | 3.89/5 |
| Vol 3 | 2.67/5 | 4.06/5 |
| Vol 4 | 2.82/5 | 4.16/5 |
| Vol 5 | 2.73/5 | 4.09/5 |
| Vol 6 | 2.94/5 | 4.18/5 |
| Vol 7 | 2.96/5 | 4.27/5 |
| Vol 8 | 2.93/5 | 4.14/5 |
| Vol 9 | 2.86/5 | 4.09/5 |
| Vol 10 | 3.18/5 | 4.33/5 |
| Vol 11 | 2.91/5 | 4.17/5 |
| Vol 12 | 3.25/5 | 4.25/5 |
| Vol 13 | 2.72/5 | 4.08/5 |
| Vol 14 | 3.15/5 | 4.25/5 |
| Vol 15 | 2.89/5 | 4.11/5 |
| Overall | 2.87/5 | 4.33/5 |