| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.99/5 | 4.63/5 |
| Vol 3-4 | 3.65/5 | 4.58/5 |
| Vol 5-6 | 2.84/5 | 4.53/5 |
| Vol 7-8 | 3.18/5 | 4.56/5 |
| Vol 9-10 | 3.23/5 | 4.58/5 |
| Vol 11-12 | 3.46/5 | 4.64/5 |
| Vol 13-14 | 3.87/5 | 4.62/5 |
| Vol 15-16 | 3.94/5 | 4.65/5 |
| Vol 17-18 | 3.16/5 | 4.54/5 |
| Vol 19-20 | 3.58/5 | 4.58/5 |
| Vol 21-22 | 3.92/5 | 4.65/5 |
| Vol 23-24 | 4.10/5 | 4.65/5 |
| Vol 25-26 | 3.32/5 | 4.58/5 |
| Vol 27 | 2.93/5 | 4.53/5 |
| Overall | 3.53/5 | 4.65/5 |