| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.00/5 | 4.66/5 |
| Vol 3-4 | 3.50/5 | 4.69/5 |
| Vol 5-6 | 3.21/5 | 4.65/5 |
| Vol 7-8 | 3.18/5 | 4.65/5 |
| Vol 9-10 | 3.37/5 | 4.66/5 |
| Vol 11-12 | 3.58/5 | 4.72/5 |
| Vol 13-14 | 3.38/5 | 4.69/5 |
| Vol 15-16 | 3.31/5 | 4.67/5 |
| Vol 17-18 | 3.89/5 | 4.72/5 |
| Vol 19-20 | 3.51/5 | 4.69/5 |
| Vol 21-22 | 3.60/5 | 4.72/5 |
| Vol 23-24 | 3.61/5 | 4.72/5 |
| Vol 25-26 | 3.14/5 | 4.64/5 |
| Vol 27-28 | 3.00/5 | 4.60/5 |
| Vol 29-30 | 3.31/5 | 4.74/5 |
| Vol 31-32 | 3.38/5 | 4.71/5 |
| Vol 33-34 | 3.95/5 | 4.80/5 |
| Overall | 3.43/5 | 4.80/5 |