| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.44/5 | 3.58/5 |
| Vol 3-4 | 2.45/5 | 3.56/5 |
| Vol 5-6 | 2.37/5 | 3.51/5 |
| Vol 7-8 | 2.44/5 | 3.64/5 |
| Vol 9-10 | 2.44/5 | 3.63/5 |
| Vol 11-12 | 2.39/5 | 3.58/5 |
| Vol 13-14 | 2.60/5 | 3.72/5 |
| Vol 15-16 | 2.52/5 | 3.72/5 |
| Vol 17-18 | 2.41/5 | 3.49/5 |
| Vol 19-20 | 2.44/5 | 3.62/5 |
| Vol 21-22 | 2.51/5 | 3.64/5 |
| Vol 23-24 | 2.48/5 | 3.63/5 |
| Vol 25-26 | 2.53/5 | 3.68/5 |
| Vol 27-28 | 2.52/5 | 3.70/5 |
| Vol 29 | 2.48/5 | 3.56/5 |
| Overall | 2.47/5 | 3.72/5 |