| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.99/5 | 4.63/5 |
| Vol 3-4 | 3.40/5 | 4.67/5 |
| Vol 5-6 | 3.54/5 | 4.69/5 |
| Vol 7-8 | 3.06/5 | 4.58/5 |
| Vol 9-10 | 2.72/5 | 4.51/5 |
| Vol 11-12 | 2.96/5 | 4.64/5 |
| Vol 13-14 | 3.26/5 | 4.63/5 |
| Vol 15-16 | 2.99/5 | 4.54/5 |
| Vol 17-18 | 3.28/5 | 4.65/5 |
| Vol 19-20 | 2.83/5 | 4.53/5 |
| Vol 21-22 | 3.34/5 | 4.63/5 |
| Vol 23-24 | 2.89/5 | 4.55/5 |
| Vol 25-26 | 3.32/5 | 4.56/5 |
| Vol 27-28 | 3.05/5 | 4.54/5 |
| Vol 29-30 | 3.43/5 | 4.63/5 |
| Vol 31-32 | 3.02/5 | 4.52/5 |
| Vol 33-34 | 2.65/5 | 4.48/5 |
| Overall | 3.12/5 | 4.69/5 |