| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1 | 2.38/5 | 4.30/5 |
| Vol 2 | 2.32/5 | 4.14/5 |
| Vol 3 | 2.29/5 | 3.62/5 |
| Vol 4 | 2.25/5 | 3.64/5 |
| Vol 5 | 2.21/5 | 3.79/5 |
| Vol 6 | 2.40/5 | 4.14/5 |
| Vol 7 | 2.37/5 | 3.79/5 |
| Vol 8 | 2.48/5 | 4.32/5 |
| Vol 9 | 2.27/5 | 4.14/5 |
| Vol 10 | 2.13/5 | 3.42/5 |
| Vol 11 | 1.98/5 | 3.00/5 |
| Vol 12 | 2.19/5 | 4.09/5 |
| Vol 13 | 2.08/5 | 2.94/5 |
| Vol 14 | 1.94/5 | 2.98/5 |
| Vol 15 | 2.15/5 | 3.42/5 |
| Overall | 2.23/5 | 4.32/5 |