| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1 | 2.97/5 | 3.96/5 |
| Vol 2 | 3.41/5 | 4.32/5 |
| Vol 3 | 3.24/5 | 4.14/5 |
| Vol 4 | 3.28/5 | 4.15/5 |
| Vol 5 | 3.42/5 | 4.38/5 |
| Vol 6 | 3.45/5 | 4.40/5 |
| Vol 7 | 3.48/5 | 4.37/5 |
| Vol 8 | 3.32/5 | 4.32/5 |
| Vol 9 | 3.45/5 | 4.38/5 |
| Vol 10 | 3.41/5 | 4.21/5 |
| Vol 11 | 3.70/5 | 4.51/5 |
| Vol 12 | 3.61/5 | 4.43/5 |
| Overall | 3.40/5 | 4.51/5 |