| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.60/5 | 4.21/5 |
| Vol 3-4 | 2.84/5 | 4.29/5 |
| Vol 5-6 | 2.74/5 | 4.38/5 |
| Vol 7-8 | 2.66/5 | 4.27/5 |
| Vol 9-10 | 2.60/5 | 4.33/5 |
| Vol 11-12 | 2.56/5 | 4.21/5 |
| Vol 13-14 | 2.52/5 | 4.03/5 |
| Vol 15-16 | 2.50/5 | 3.90/5 |
| Vol 17-18 | 2.49/5 | 4.25/5 |
| Vol 19-20 | 2.74/5 | 4.44/5 |
| Vol 21-22 | 2.40/5 | 4.17/5 |
| Vol 23-24 | 2.43/5 | 4.03/5 |
| Vol 25-26 | 2.48/5 | 4.00/5 |
| Overall | 2.58/5 | 4.44/5 |