| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.66/5 | 3.80/5 |
| Vol 3-4 | 2.68/5 | 3.78/5 |
| Vol 5-6 | 2.70/5 | 3.73/5 |
| Vol 7-8 | 2.84/5 | 4.22/5 |
| Vol 9-10 | 2.64/5 | 4.14/5 |
| Vol 11-12 | 2.88/5 | 4.16/5 |
| Vol 13-14 | 2.88/5 | 4.28/5 |
| Vol 15-16 | 2.95/5 | 4.15/5 |
| Vol 17-18 | 2.66/5 | 4.03/5 |
| Vol 19-20 | 2.74/5 | 4.08/5 |
| Vol 21-22 | 2.92/5 | 4.26/5 |
| Vol 23-24 | 2.98/5 | 4.27/5 |
| Vol 25-26 | 2.90/5 | 4.23/5 |
| Vol 27-28 | 2.95/5 | 4.20/5 |
| Vol 29 | 2.76/5 | 4.03/5 |
| Overall | 2.81/5 | 4.28/5 |