| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.40/5 | 4.42/5 |
| Vol 3-4 | 3.44/5 | 4.45/5 |
| Vol 5-6 | 3.29/5 | 4.33/5 |
| Vol 7-8 | 3.34/5 | 4.37/5 |
| Vol 9-10 | 3.52/5 | 4.41/5 |
| Vol 11-12 | 3.44/5 | 4.37/5 |
| Vol 13-14 | 3.20/5 | 4.24/5 |
| Vol 15-16 | 3.28/5 | 4.43/5 |
| Vol 17-18 | 3.48/5 | 4.55/5 |
| Vol 19-20 | 3.80/5 | 4.55/5 |
| Vol 21-22 | 3.69/5 | 4.57/5 |
| Vol 23-24 | 3.80/5 | 4.57/5 |
| Vol 25-26 | 3.78/5 | 4.58/5 |
| Overall | 3.50/5 | 4.58/5 |