| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 1.72/5 | 2.98/5 |
| Vol 3-4 | 1.73/5 | 4.03/5 |
| Vol 5-6 | 1.64/5 | 4.14/5 |
| Vol 7-8 | 1.70/5 | 3.00/5 |
| Vol 9-10 | 1.70/5 | 3.75/5 |
| Vol 11-12 | 1.72/5 | 4.03/5 |
| Vol 13-14 | 1.96/5 | 4.19/5 |
| Vol 15-16 | 2.03/5 | 4.27/5 |
| Vol 17-18 | 1.78/5 | 4.00/5 |
| Vol 19-20 | 1.84/5 | 4.12/5 |
| Vol 21-22 | 1.77/5 | 4.03/5 |
| Vol 23-24 | 1.98/5 | 4.03/5 |
| Vol 25-26 | 1.64/5 | 3.50/5 |
| Vol 27-28 | 1.83/5 | 3.20/5 |
| Overall | 1.79/5 | 4.27/5 |