| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1 | 2.64/5 | 4.38/5 |
| Vol 2 | 3.17/5 | 4.50/5 |
| Vol 3 | 2.83/5 | 4.43/5 |
| Vol 4 | 3.29/5 | 4.38/5 |
| Vol 5 | 2.91/5 | 4.52/5 |
| Vol 6 | 2.27/5 | 4.15/5 |
| Vol 7 | 2.49/5 | 4.29/5 |
| Vol 8 | 2.79/5 | 4.56/5 |
| Vol 9 | 2.24/5 | 4.21/5 |
| Vol 10 | 3.00/5 | 4.52/5 |
| Vol 11 | 3.40/5 | 4.61/5 |
| Vol 12 | 2.90/5 | 4.52/5 |
| Vol 13 | 2.55/5 | 4.43/5 |
| Vol 14 | 2.15/5 | 4.10/5 |
| Vol 15 | 2.14/5 | 4.01/5 |
| Overall | 2.71/5 | 4.61/5 |