| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.33/5 | 4.57/5 |
| Vol 3-4 | 3.13/5 | 4.52/5 |
| Vol 5-6 | 2.97/5 | 4.50/5 |
| Vol 7-8 | 3.94/5 | 4.59/5 |
| Vol 9-10 | 3.70/5 | 4.56/5 |
| Vol 11-12 | 3.79/5 | 4.59/5 |
| Vol 13-14 | 3.65/5 | 4.60/5 |
| Vol 15-16 | 3.02/5 | 4.51/5 |
| Vol 17-18 | 3.02/5 | 4.49/5 |
| Vol 19-20 | 3.29/5 | 4.54/5 |
| Vol 21-22 | 3.16/5 | 4.53/5 |
| Vol 23-24 | 3.35/5 | 4.57/5 |
| Vol 25-26 | 3.86/5 | 4.58/5 |
| Vol 27-28 | 3.48/5 | 4.57/5 |
| Vol 29-30 | 3.58/5 | 4.54/5 |
| Vol 31-32 | 3.64/5 | 4.56/5 |
| Vol 33-34 | 3.29/5 | 4.53/5 |
| Vol 35 | 3.02/5 | 4.49/5 |
| Overall | 3.41/5 | 4.60/5 |