| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.86/5 | 4.44/5 |
| Vol 3-4 | 2.90/5 | 4.47/5 |
| Vol 5-6 | 2.80/5 | 4.29/5 |
| Vol 7-8 | 2.94/5 | 4.41/5 |
| Vol 9-10 | 2.82/5 | 4.27/5 |
| Vol 11-12 | 3.09/5 | 4.44/5 |
| Vol 13-14 | 2.94/5 | 4.38/5 |
| Vol 15-16 | 2.86/5 | 4.36/5 |
| Vol 17-18 | 2.89/5 | 4.33/5 |
| Vol 19-20 | 2.74/5 | 4.25/5 |
| Vol 21-22 | 2.82/5 | 4.33/5 |
| Vol 23-24 | 2.92/5 | 4.48/5 |
| Vol 25-26 | 2.78/5 | 4.27/5 |
| Vol 27-28 | 2.84/5 | 4.39/5 |
| Vol 29-30 | 2.83/5 | 4.25/5 |
| Vol 31-32 | 2.76/5 | 4.12/5 |
| Vol 33-34 | 2.76/5 | 4.33/5 |
| Vol 35-36 | 2.99/5 | 4.30/5 |
| Vol 37-38 | 2.83/5 | 4.40/5 |
| Overall | 2.86/5 | 4.48/5 |