| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.70/5 | 3.86/5 |
| Vol 3-4 | 2.68/5 | 3.89/5 |
| Vol 5-6 | 2.59/5 | 3.90/5 |
| Vol 7-8 | 2.78/5 | 3.90/5 |
| Vol 9-10 | 2.44/5 | 3.76/5 |
| Vol 11-12 | 2.18/5 | 3.64/5 |
| Vol 13-14 | 2.52/5 | 3.83/5 |
| Vol 15-16 | 2.18/5 | 3.82/5 |
| Vol 17-18 | 2.71/5 | 4.03/5 |
| Vol 19-20 | 2.47/5 | 3.80/5 |
| Vol 21-22 | 2.80/5 | 3.92/5 |
| Vol 23-24 | 2.28/5 | 4.01/5 |
| Vol 25-26 | 2.80/5 | 4.19/5 |
| Overall | 2.55/5 | 4.19/5 |