| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 4.04/5 | 4.45/5 |
| Vol 3-4 | 4.00/5 | 4.42/5 |
| Vol 5-6 | 4.03/5 | 4.43/5 |
| Vol 7-8 | 4.03/5 | 4.43/5 |
| Vol 9-10 | 4.08/5 | 4.47/5 |
| Vol 11-12 | 4.02/5 | 4.43/5 |
| Vol 13-14 | 4.03/5 | 4.44/5 |
| Vol 15-16 | 4.08/5 | 4.46/5 |
| Vol 17-18 | 3.99/5 | 4.42/5 |
| Vol 19-20 | 4.02/5 | 4.45/5 |
| Vol 21-22 | 4.07/5 | 4.45/5 |
| Vol 23-24 | 4.07/5 | 4.46/5 |
| Vol 25-26 | 4.04/5 | 4.45/5 |
| Vol 27 | 3.99/5 | 4.41/5 |
| Overall | 4.04/5 | 4.47/5 |