| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.07/5 | 4.52/5 |
| Vol 3-4 | 3.29/5 | 4.57/5 |
| Vol 5-6 | 3.37/5 | 4.58/5 |
| Vol 7-8 | 3.56/5 | 4.57/5 |
| Vol 9-10 | 3.01/5 | 4.52/5 |
| Vol 11-12 | 3.91/5 | 4.63/5 |
| Vol 13-14 | 3.42/5 | 4.58/5 |
| Vol 15-16 | 3.89/5 | 4.62/5 |
| Vol 17-18 | 3.51/5 | 4.67/5 |
| Vol 19-20 | 3.92/5 | 4.62/5 |
| Vol 21-22 | 3.50/5 | 4.58/5 |
| Vol 23-24 | 3.38/5 | 4.57/5 |
| Vol 25-26 | 3.89/5 | 4.64/5 |
| Overall | 3.55/5 | 4.67/5 |