| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.68/5 | 4.54/5 |
| Vol 3-4 | 3.16/5 | 4.58/5 |
| Vol 5-6 | 3.14/5 | 4.57/5 |
| Vol 7-8 | 3.90/5 | 4.67/5 |
| Vol 9-10 | 4.02/5 | 4.66/5 |
| Vol 11-12 | 3.34/5 | 4.59/5 |
| Vol 13-14 | 4.05/5 | 4.63/5 |
| Vol 15-16 | 3.46/5 | 4.60/5 |
| Vol 17-18 | 3.52/5 | 4.61/5 |
| Vol 19-20 | 2.62/5 | 4.48/5 |
| Vol 21-22 | 3.92/5 | 4.66/5 |
| Vol 23-24 | 3.66/5 | 4.63/5 |
| Vol 25-26 | 4.10/5 | 4.65/5 |
| Vol 27-28 | 3.04/5 | 4.56/5 |
| Vol 29-30 | 2.93/5 | 4.56/5 |
| Vol 31-32 | 3.44/5 | 4.60/5 |
| Vol 33-34 | 3.65/5 | 4.62/5 |
| Vol 35-36 | 2.47/5 | 4.45/5 |
| Vol 37 | 3.25/5 | 4.54/5 |
| Overall | 3.39/5 | 4.67/5 |