| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.60/5 | 4.64/5 |
| Vol 3-4 | 2.38/5 | 4.35/5 |
| Vol 5-6 | 2.37/5 | 4.53/5 |
| Vol 7-8 | 2.65/5 | 4.53/5 |
| Vol 9-10 | 2.63/5 | 4.50/5 |
| Vol 11-12 | 2.63/5 | 4.46/5 |
| Vol 13-14 | 2.46/5 | 4.53/5 |
| Vol 15-16 | 2.65/5 | 4.57/5 |
| Vol 17-18 | 2.51/5 | 4.42/5 |
| Vol 19-20 | 2.54/5 | 4.53/5 |
| Vol 21-22 | 2.05/5 | 4.12/5 |
| Vol 23-24 | 2.31/5 | 4.42/5 |
| Vol 25-26 | 2.40/5 | 4.42/5 |
| Vol 27-28 | 2.50/5 | 4.56/5 |
| Vol 29-30 | 2.29/5 | 4.35/5 |
| Overall | 2.48/5 | 4.64/5 |