| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.74/5 | 4.44/5 |
| Vol 3-4 | 2.93/5 | 4.52/5 |
| Vol 5-6 | 2.88/5 | 4.51/5 |
| Vol 7-8 | 3.10/5 | 4.54/5 |
| Vol 9-10 | 2.44/5 | 4.39/5 |
| Vol 11-12 | 2.57/5 | 4.36/5 |
| Vol 13-14 | 2.48/5 | 4.40/5 |
| Vol 15-16 | 2.56/5 | 4.45/5 |
| Vol 17-18 | 2.40/5 | 4.46/5 |
| Vol 19-20 | 2.11/5 | 4.21/5 |
| Vol 21-22 | 2.46/5 | 4.43/5 |
| Vol 23-24 | 2.26/5 | 4.33/5 |
| Vol 25-26 | 2.14/5 | 4.24/5 |
| Vol 27-28 | 2.30/5 | 4.39/5 |
| Vol 29-30 | 2.35/5 | 4.38/5 |
| Vol 31-32 | 2.02/5 | 4.34/5 |
| Vol 33-34 | 1.98/5 | 4.12/5 |
| Vol 35-36 | 2.09/5 | 4.35/5 |
| Vol 37 | 2.72/5 | 4.43/5 |
| Overall | 2.44/5 | 4.54/5 |