| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.86/5 | 4.08/5 |
| Vol 3-4 | 3.01/5 | 4.29/5 |
| Vol 5-6 | 3.02/5 | 4.28/5 |
| Vol 7-8 | 3.00/5 | 4.16/5 |
| Vol 9-10 | 2.84/5 | 4.09/5 |
| Vol 11-12 | 3.06/5 | 4.24/5 |
| Vol 13-14 | 3.23/5 | 4.37/5 |
| Vol 15-16 | 3.18/5 | 4.34/5 |
| Vol 17-18 | 3.25/5 | 4.36/5 |
| Vol 19-20 | 3.39/5 | 4.42/5 |
| Vol 21-22 | 2.88/5 | 4.15/5 |
| Vol 23-24 | 3.12/5 | 4.36/5 |
| Vol 25-26 | 3.08/5 | 4.28/5 |
| Vol 27-28 | 3.06/5 | 4.22/5 |
| Vol 29-30 | 3.27/5 | 4.30/5 |
| Vol 31-32 | 3.28/5 | 4.28/5 |
| Vol 33-34 | 3.22/5 | 4.30/5 |
| Vol 35-36 | 3.38/5 | 4.48/5 |
| Vol 37-38 | 3.16/5 | 4.28/5 |
| Vol 39-40 | 3.22/5 | 4.28/5 |
| Vol 41-42 | 3.06/5 | 4.17/5 |
| Vol 43-44 | 3.12/5 | 4.42/5 |
| Vol 45 | 3.05/5 | 4.19/5 |
| Overall | 3.12/5 | 4.48/5 |