| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.96/5 | 4.68/5 |
| Vol 3-4 | 3.10/5 | 4.73/5 |
| Vol 5-6 | 3.01/5 | 4.71/5 |
| Vol 7-8 | 2.99/5 | 4.68/5 |
| Vol 9-10 | 2.91/5 | 4.67/5 |
| Vol 11-12 | 3.09/5 | 4.67/5 |
| Vol 13-14 | 2.95/5 | 4.65/5 |
| Vol 15-16 | 2.99/5 | 4.63/5 |
| Vol 17-18 | 3.06/5 | 4.64/5 |
| Vol 19-20 | 3.08/5 | 4.67/5 |
| Vol 21-22 | 2.92/5 | 4.68/5 |
| Vol 23-24 | 2.94/5 | 4.67/5 |
| Vol 25-26 | 2.99/5 | 4.72/5 |
| Vol 27-28 | 2.85/5 | 4.60/5 |
| Vol 29-30 | 2.91/5 | 4.64/5 |
| Vol 31-32 | 2.98/5 | 4.70/5 |
| Vol 33 | 2.68/5 | 4.34/5 |
| Overall | 2.98/5 | 4.73/5 |