| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.03/5 | 4.60/5 |
| Vol 3-4 | 3.36/5 | 4.63/5 |
| Vol 5-6 | 3.43/5 | 4.65/5 |
| Vol 7-8 | 3.64/5 | 4.67/5 |
| Vol 9-10 | 2.75/5 | 4.63/5 |
| Vol 11-12 | 3.97/5 | 4.65/5 |
| Vol 13-14 | 3.33/5 | 4.61/5 |
| Vol 15-16 | 4.04/5 | 4.63/5 |
| Vol 17-18 | 4.13/5 | 4.69/5 |
| Vol 19-20 | 4.08/5 | 4.65/5 |
| Vol 21-22 | 3.63/5 | 4.64/5 |
| Vol 23-24 | 4.07/5 | 4.66/5 |
| Vol 25-26 | 3.23/5 | 4.62/5 |
| Vol 27-28 | 3.03/5 | 4.59/5 |
| Vol 29 | 3.30/5 | 4.58/5 |
| Overall | 3.50/5 | 4.69/5 |