| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.11/5 | 4.55/5 |
| Vol 3-4 | 3.14/5 | 4.55/5 |
| Vol 5-6 | 3.25/5 | 4.59/5 |
| Vol 7-8 | 3.23/5 | 4.57/5 |
| Vol 9-10 | 3.05/5 | 4.58/5 |
| Vol 11-12 | 3.32/5 | 4.58/5 |
| Vol 13-14 | 2.68/5 | 4.48/5 |
| Vol 15-16 | 2.70/5 | 4.57/5 |
| Vol 17-18 | 2.78/5 | 4.48/5 |
| Vol 19-20 | 2.48/5 | 4.43/5 |
| Vol 21-22 | 3.28/5 | 4.59/5 |
| Vol 23-24 | 3.33/5 | 4.56/5 |
| Vol 25-26 | 3.28/5 | 4.62/5 |
| Vol 27-28 | 2.99/5 | 4.63/5 |
| Vol 29-30 | 3.12/5 | 4.61/5 |
| Vol 31-32 | 3.45/5 | 4.68/5 |
| Vol 33-34 | 4.18/5 | 4.70/5 |
| Overall | 3.16/5 | 4.70/5 |