| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.24/5 | 4.27/5 |
| Vol 3-4 | 2.53/5 | 4.49/5 |
| Vol 5-6 | 2.61/5 | 4.35/5 |
| Vol 7-8 | 2.61/5 | 4.40/5 |
| Vol 9-10 | 2.56/5 | 4.31/5 |
| Vol 11-12 | 2.68/5 | 4.37/5 |
| Vol 13-14 | 3.03/5 | 4.59/5 |
| Vol 15-16 | 2.68/5 | 4.59/5 |
| Vol 17-18 | 2.31/5 | 4.26/5 |
| Vol 19-20 | 2.44/5 | 4.26/5 |
| Vol 21-22 | 2.44/5 | 4.28/5 |
| Vol 23-24 | 2.72/5 | 4.44/5 |
| Vol 25-26 | 2.59/5 | 4.36/5 |
| Vol 27-28 | 2.84/5 | 4.49/5 |
| Vol 29-30 | 2.28/5 | 4.26/5 |
| Vol 31-32 | 2.06/5 | 4.14/5 |
| Vol 33-34 | 1.82/5 | 4.08/5 |
| Overall | 2.50/5 | 4.59/5 |