| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.65/5 | 4.27/5 |
| Vol 3-4 | 2.69/5 | 4.40/5 |
| Vol 5-6 | 2.79/5 | 4.53/5 |
| Vol 7-8 | 2.80/5 | 4.53/5 |
| Vol 9-10 | 2.73/5 | 4.44/5 |
| Vol 11-12 | 2.83/5 | 4.61/5 |
| Vol 13-14 | 2.88/5 | 4.57/5 |
| Vol 15-16 | 2.85/5 | 4.57/5 |
| Vol 17-18 | 2.90/5 | 4.65/5 |
| Vol 19-20 | 2.89/5 | 4.62/5 |
| Vol 21-22 | 2.70/5 | 4.44/5 |
| Vol 23-24 | 2.75/5 | 4.61/5 |
| Vol 25-26 | 2.92/5 | 4.70/5 |
| Vol 27 | 2.79/5 | 4.63/5 |
| Overall | 2.79/5 | 4.70/5 |