| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.29/5 | 4.53/5 |
| Vol 3-4 | 2.43/5 | 4.46/5 |
| Vol 5-6 | 2.28/5 | 4.50/5 |
| Vol 7-8 | 2.33/5 | 4.39/5 |
| Vol 9-10 | 2.08/5 | 4.36/5 |
| Vol 11-12 | 2.31/5 | 4.48/5 |
| Vol 13-14 | 2.40/5 | 4.53/5 |
| Vol 15-16 | 2.26/5 | 4.42/5 |
| Vol 17-18 | 2.21/5 | 4.46/5 |
| Vol 19-20 | 2.17/5 | 4.46/5 |
| Vol 21-22 | 2.52/5 | 4.56/5 |
| Vol 23-24 | 2.66/5 | 4.58/5 |
| Vol 25-26 | 2.67/5 | 4.66/5 |
| Vol 27-28 | 2.23/5 | 4.46/5 |
| Overall | 2.35/5 | 4.66/5 |