| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.52/5 | 4.38/5 |
| Vol 3-4 | 2.52/5 | 4.12/5 |
| Vol 5-6 | 2.58/5 | 4.21/5 |
| Vol 7-8 | 2.52/5 | 4.32/5 |
| Vol 9-10 | 2.62/5 | 4.44/5 |
| Vol 11-12 | 2.66/5 | 4.35/5 |
| Vol 13-14 | 2.48/5 | 4.23/5 |
| Vol 15-16 | 2.53/5 | 4.29/5 |
| Vol 17-18 | 2.61/5 | 4.32/5 |
| Vol 19-20 | 2.60/5 | 4.37/5 |
| Vol 21-22 | 2.62/5 | 4.45/5 |
| Vol 23-24 | 2.63/5 | 4.38/5 |
| Vol 25-26 | 2.58/5 | 4.33/5 |
| Vol 27-28 | 2.60/5 | 4.33/5 |
| Vol 29-30 | 2.54/5 | 4.42/5 |
| Vol 31-32 | 2.66/5 | 4.42/5 |
| Vol 33-34 | 2.52/5 | 4.36/5 |
| Vol 35-36 | 2.56/5 | 4.35/5 |
| Vol 37-38 | 2.66/5 | 4.47/5 |
| Vol 39-40 | 2.37/5 | 4.31/5 |
| Vol 41-42 | 2.29/5 | 4.29/5 |
| Vol 43-44 | 2.58/5 | 4.48/5 |
| Vol 45-46 | 2.50/5 | 4.43/5 |
| Overall | 2.55/5 | 4.48/5 |