| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.38/5 | 4.43/5 |
| Vol 3-4 | 2.16/5 | 4.14/5 |
| Vol 5-6 | 2.18/5 | 4.32/5 |
| Vol 7-8 | 2.44/5 | 4.32/5 |
| Vol 9-10 | 2.41/5 | 4.29/5 |
| Vol 11-12 | 2.42/5 | 4.25/5 |
| Vol 13-14 | 2.24/5 | 4.32/5 |
| Vol 15-16 | 2.42/5 | 4.36/5 |
| Vol 17-18 | 2.30/5 | 4.21/5 |
| Vol 19-20 | 2.34/5 | 4.32/5 |
| Vol 21-22 | 1.84/5 | 3.91/5 |
| Vol 23-24 | 2.06/5 | 4.21/5 |
| Vol 25-26 | 2.19/5 | 4.21/5 |
| Vol 27-28 | 2.22/5 | 4.35/5 |
| Vol 29-30 | 2.08/5 | 4.14/5 |
| Overall | 2.25/5 | 4.43/5 |