| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.85/5 | 4.63/5 |
| Vol 3-4 | 2.67/5 | 4.59/5 |
| Vol 5-6 | 2.90/5 | 4.65/5 |
| Vol 7-8 | 2.95/5 | 4.69/5 |
| Vol 9-10 | 2.85/5 | 4.65/5 |
| Vol 11-12 | 2.79/5 | 4.64/5 |
| Vol 13-14 | 3.02/5 | 4.68/5 |
| Vol 15-16 | 3.07/5 | 4.70/5 |
| Vol 17-18 | 2.69/5 | 4.50/5 |
| Vol 19-20 | 2.74/5 | 4.52/5 |
| Vol 21-22 | 3.00/5 | 4.76/5 |
| Vol 23-24 | 3.25/5 | 4.73/5 |
| Vol 25-26 | 3.41/5 | 4.79/5 |
| Vol 27-28 | 2.79/5 | 4.56/5 |
| Overall | 2.92/5 | 4.79/5 |