| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.93/5 | 4.44/5 |
| Vol 3-4 | 3.98/5 | 4.47/5 |
| Vol 5-6 | 3.90/5 | 4.43/5 |
| Vol 7-8 | 4.01/5 | 4.49/5 |
| Vol 9-10 | 3.89/5 | 4.45/5 |
| Vol 11-12 | 4.07/5 | 4.49/5 |
| Vol 13-14 | 4.07/5 | 4.49/5 |
| Vol 15-16 | 4.09/5 | 4.50/5 |
| Vol 17-18 | 4.12/5 | 4.52/5 |
| Vol 19-20 | 4.02/5 | 4.48/5 |
| Vol 21-22 | 3.95/5 | 4.44/5 |
| Vol 23-24 | 3.92/5 | 4.45/5 |
| Vol 25-26 | 3.98/5 | 4.45/5 |
| Vol 27-28 | 3.97/5 | 4.45/5 |
| Vol 29 | 3.95/5 | 4.44/5 |
| Overall | 3.99/5 | 4.52/5 |