| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1 | 2.46/5 | 3.57/5 |
| Vol 2 | 2.69/5 | 4.32/5 |
| Vol 3 | 2.89/5 | 4.29/5 |
| Vol 4 | 2.67/5 | 4.09/5 |
| Vol 5 | 2.80/5 | 4.43/5 |
| Vol 6 | 2.67/5 | 4.23/5 |
| Vol 7 | 2.72/5 | 4.25/5 |
| Vol 8 | 2.94/5 | 4.33/5 |
| Vol 9 | 2.71/5 | 4.27/5 |
| Vol 10 | 2.83/5 | 4.42/5 |
| Vol 11 | 2.84/5 | 4.42/5 |
| Vol 12 | 3.25/5 | 4.50/5 |
| Vol 13 | 3.20/5 | 4.45/5 |
| Vol 14 | 2.80/5 | 4.36/5 |
| Vol 15 | 2.82/5 | 4.40/5 |
| Overall | 2.82/5 | 4.50/5 |