| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.34/5 | 4.60/5 |
| Vol 3-4 | 4.50/5 | 4.80/5 |
| Vol 7-8 | 4.34/5 | 4.80/5 |
| Vol 10-11 | 2.30/5 | 3.40/5 |
| Vol 12-13 | 4.37/5 | 4.80/5 |
| Vol 14-15 | 3.78/5 | 4.60/5 |
| Vol 16-18 | 4.50/5 | 4.80/5 |
| Vol 20-21 | 4.00/5 | 4.60/5 |
| Vol 23-24 | 3.12/5 | 4.70/5 |
| Vol 25-26 | 4.50/5 | 4.80/5 |
| Vol 27-28 | 4.27/5 | 4.80/5 |
| Vol 29-33 | 3.50/5 | 4.40/5 |
| Vol 34-35 | 3.50/5 | 3.80/5 |
| Overall | 3.75/5 | 4.80/5 |