| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.30/5 | 4.13/5 |
| Vol 3-4 | 3.33/5 | 4.23/5 |
| Vol 5-6 | 3.48/5 | 4.31/5 |
| Vol 7-8 | 3.61/5 | 4.41/5 |
| Vol 9-10 | 3.56/5 | 4.40/5 |
| Vol 11-12 | 3.64/5 | 4.40/5 |
| Vol 13-14 | 3.24/5 | 4.22/5 |
| Vol 15-16 | 3.49/5 | 4.38/5 |
| Vol 17-18 | 3.42/5 | 4.31/5 |
| Vol 19-20 | 3.24/5 | 4.27/5 |
| Vol 21-22 | 3.21/5 | 4.17/5 |
| Vol 23-24 | 3.38/5 | 4.37/5 |
| Vol 25-26 | 3.55/5 | 4.36/5 |
| Vol 27-28 | 3.35/5 | 4.25/5 |
| Vol 29-30 | 3.56/5 | 4.38/5 |
| Vol 31-32 | 3.43/5 | 4.35/5 |
| Vol 33-34 | 3.30/5 | 4.28/5 |
| Vol 35-36 | 3.16/5 | 4.14/5 |
| Vol 37-38 | 3.24/5 | 4.26/5 |
| Vol 39-40 | 3.31/5 | 4.27/5 |
| Vol 41-42 | 3.29/5 | 4.23/5 |
| Vol 43-44 | 3.60/5 | 4.38/5 |
| Vol 45-46 | 3.59/5 | 4.44/5 |
| Overall | 3.40/5 | 4.44/5 |