| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.83/5 | 4.48/5 |
| Vol 3-4 | 2.72/5 | 4.41/5 |
| Vol 5-6 | 2.61/5 | 4.36/5 |
| Vol 7-8 | 2.66/5 | 4.43/5 |
| Vol 9-10 | 2.60/5 | 4.41/5 |
| Vol 11-12 | 2.52/5 | 4.27/5 |
| Vol 13-14 | 2.42/5 | 4.33/5 |
| Vol 15-16 | 2.66/5 | 4.44/5 |
| Vol 17-18 | 2.60/5 | 4.32/5 |
| Vol 19-20 | 2.59/5 | 4.38/5 |
| Vol 21-22 | 2.68/5 | 4.44/5 |
| Vol 23-24 | 2.74/5 | 4.32/5 |
| Vol 25-26 | 2.73/5 | 4.43/5 |
| Vol 27-28 | 2.66/5 | 4.38/5 |
| Vol 29-30 | 2.78/5 | 4.42/5 |
| Vol 31-32 | 2.66/5 | 4.32/5 |
| Vol 33-34 | 2.76/5 | 4.39/5 |
| Vol 35-36 | 2.76/5 | 4.41/5 |
| Vol 37-38 | 2.74/5 | 4.36/5 |
| Vol 39-40 | 2.51/5 | 4.32/5 |
| Vol 41-42 | 2.55/5 | 4.27/5 |
| Vol 43-44 | 2.68/5 | 4.41/5 |
| Vol 45-46 | 2.43/5 | 4.30/5 |
| Vol 47-48 | 2.52/5 | 4.23/5 |
| Vol 49 | 2.44/5 | 4.06/5 |
| Overall | 2.64/5 | 4.48/5 |