| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.82/5 | 4.56/5 |
| Vol 3-4 | 2.70/5 | 4.63/5 |
| Vol 5-6 | 2.91/5 | 4.64/5 |
| Vol 7-8 | 2.63/5 | 4.52/5 |
| Vol 9-10 | 2.68/5 | 4.37/5 |
| Vol 11-12 | 2.48/5 | 4.31/5 |
| Vol 13-14 | 2.41/5 | 4.40/5 |
| Vol 15-16 | 2.48/5 | 4.40/5 |
| Vol 17-18 | 2.59/5 | 4.56/5 |
| Vol 19-20 | 2.76/5 | 4.50/5 |
| Vol 21-22 | 2.48/5 | 4.40/5 |
| Vol 23-24 | 2.37/5 | 4.40/5 |
| Vol 25-26 | 3.15/5 | 4.70/5 |
| Overall | 2.70/5 | 4.70/5 |