| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.13/5 | 4.79/5 |
| Vol 3-4 | 2.88/5 | 4.62/5 |
| Vol 5-6 | 2.83/5 | 4.69/5 |
| Vol 7-8 | 2.85/5 | 4.48/5 |
| Vol 9-10 | 2.50/5 | 4.45/5 |
| Vol 11-12 | 2.91/5 | 4.69/5 |
| Vol 13-14 | 2.67/5 | 4.39/5 |
| Vol 15-16 | 2.76/5 | 4.62/5 |
| Vol 17-18 | 2.66/5 | 4.62/5 |
| Vol 19-20 | 2.74/5 | 4.48/5 |
| Vol 21-22 | 2.63/5 | 4.42/5 |
| Vol 23-24 | 2.68/5 | 4.56/5 |
| Vol 25-26 | 3.05/5 | 4.58/5 |
| Vol 27-28 | 2.83/5 | 4.71/5 |
| Overall | 2.80/5 | 4.79/5 |