| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1 | 2.31/5 | 3.75/5 |
| Vol 2 | 2.50/5 | 3.80/5 |
| Vol 3 | 2.58/5 | 3.97/5 |
| Vol 4 | 2.73/5 | 4.07/5 |
| Vol 5 | 2.64/5 | 4.00/5 |
| Vol 6 | 2.85/5 | 4.09/5 |
| Vol 7 | 2.87/5 | 4.18/5 |
| Vol 8 | 2.84/5 | 4.05/5 |
| Vol 9 | 2.77/5 | 4.00/5 |
| Vol 10 | 3.09/5 | 4.24/5 |
| Vol 11 | 2.82/5 | 4.08/5 |
| Vol 12 | 3.16/5 | 4.16/5 |
| Vol 13 | 2.63/5 | 3.99/5 |
| Vol 14 | 3.06/5 | 4.16/5 |
| Vol 15 | 2.80/5 | 4.02/5 |
| Overall | 2.76/5 | 4.24/5 |