| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.50/5 | 4.79/5 |
| Vol 3-4 | 2.46/5 | 4.07/5 |
| Vol 5-6 | 2.51/5 | 4.32/5 |
| Vol 7-8 | 2.52/5 | 4.52/5 |
| Vol 9-10 | 2.68/5 | 4.74/5 |
| Vol 11-12 | 2.49/5 | 4.38/5 |
| Vol 13-14 | 2.60/5 | 4.58/5 |
| Vol 15-16 | 2.61/5 | 4.56/5 |
| Vol 17-18 | 2.34/5 | 4.52/5 |
| Vol 19-20 | 2.14/5 | 4.48/5 |
| Vol 21-22 | 2.56/5 | 4.52/5 |
| Vol 23-24 | 2.98/5 | 4.82/5 |
| Vol 25-26 | 2.67/5 | 4.54/5 |
| Vol 27 | 3.91/5 | 4.83/5 |
| Overall | 2.78/5 | 4.83/5 |