| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.59/5 | 4.36/5 |
| Vol 3-4 | 2.92/5 | 4.44/5 |
| Vol 5-6 | 2.98/5 | 4.51/5 |
| Vol 7-8 | 2.78/5 | 4.42/5 |
| Vol 9-10 | 2.73/5 | 4.30/5 |
| Vol 11-12 | 2.68/5 | 4.25/5 |
| Vol 13-14 | 3.08/5 | 4.48/5 |
| Vol 15-16 | 3.02/5 | 4.47/5 |
| Vol 17-18 | 3.50/5 | 4.60/5 |
| Vol 19-20 | 3.18/5 | 4.52/5 |
| Vol 21-22 | 2.98/5 | 4.51/5 |
| Vol 23-24 | 3.30/5 | 4.52/5 |
| Vol 25-26 | 3.28/5 | 4.52/5 |
| Vol 27-28 | 3.26/5 | 4.50/5 |
| Vol 29-30 | 3.36/5 | 4.54/5 |
| Vol 31-32 | 3.36/5 | 4.54/5 |
| Vol 33 | 2.87/5 | 4.29/5 |
| Overall | 3.06/5 | 4.60/5 |