| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.88/5 | 4.52/5 |
| Vol 3-4 | 3.29/5 | 4.56/5 |
| Vol 5-6 | 3.43/5 | 4.58/5 |
| Vol 7-8 | 2.95/5 | 4.47/5 |
| Vol 9-10 | 2.61/5 | 4.40/5 |
| Vol 11-12 | 2.85/5 | 4.53/5 |
| Vol 13-14 | 3.15/5 | 4.52/5 |
| Vol 15-16 | 2.88/5 | 4.43/5 |
| Vol 17-18 | 3.17/5 | 4.54/5 |
| Vol 19-20 | 2.72/5 | 4.42/5 |
| Vol 21-22 | 3.23/5 | 4.52/5 |
| Vol 23-24 | 2.78/5 | 4.44/5 |
| Vol 25-26 | 3.21/5 | 4.45/5 |
| Vol 27-28 | 2.94/5 | 4.43/5 |
| Vol 29-30 | 3.32/5 | 4.52/5 |
| Vol 31-32 | 2.91/5 | 4.41/5 |
| Vol 33-34 | 2.54/5 | 4.37/5 |
| Overall | 3.01/5 | 4.58/5 |