| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.82/5 | 4.38/5 |
| Vol 3-4 | 4.00/5 | 4.45/5 |
| Vol 5-6 | 3.96/5 | 4.45/5 |
| Vol 7-8 | 3.99/5 | 4.44/5 |
| Vol 9-10 | 3.91/5 | 4.40/5 |
| Vol 11-12 | 4.00/5 | 4.44/5 |
| Vol 13-14 | 3.89/5 | 4.39/5 |
| Vol 15-16 | 3.89/5 | 4.41/5 |
| Vol 17-18 | 3.99/5 | 4.44/5 |
| Vol 19-20 | 3.96/5 | 4.43/5 |
| Vol 21-22 | 3.93/5 | 4.44/5 |
| Vol 23-24 | 4.00/5 | 4.43/5 |
| Vol 25-26 | 3.99/5 | 4.44/5 |
| Vol 27 | 4.06/5 | 4.46/5 |
| Overall | 3.95/5 | 4.46/5 |