| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.74/5 | 4.51/5 |
| Vol 3-4 | 3.09/5 | 4.59/5 |
| Vol 5-6 | 3.13/5 | 4.66/5 |
| Vol 7-8 | 2.94/5 | 4.57/5 |
| Vol 9-10 | 2.88/5 | 4.45/5 |
| Vol 11-12 | 2.84/5 | 4.40/5 |
| Vol 13-14 | 3.23/5 | 4.63/5 |
| Vol 15-16 | 3.16/5 | 4.62/5 |
| Vol 17-18 | 3.55/5 | 4.75/5 |
| Vol 19-20 | 3.34/5 | 4.67/5 |
| Vol 21-22 | 3.13/5 | 4.66/5 |
| Vol 23-24 | 3.44/5 | 4.67/5 |
| Vol 25-26 | 3.43/5 | 4.67/5 |
| Vol 27-28 | 3.42/5 | 4.65/5 |
| Vol 29-30 | 3.51/5 | 4.69/5 |
| Vol 31-32 | 3.52/5 | 4.69/5 |
| Vol 33 | 3.02/5 | 4.44/5 |
| Overall | 3.19/5 | 4.75/5 |