| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.05/5 | 3.99/5 |
| Vol 3-4 | 2.78/5 | 4.03/5 |
| Vol 5-6 | 2.91/5 | 3.91/5 |
| Vol 7-8 | 3.10/5 | 4.25/5 |
| Vol 9-10 | 2.60/5 | 3.93/5 |
| Vol 11-12 | 3.14/5 | 4.18/5 |
| Vol 13-14 | 3.35/5 | 4.15/5 |
| Vol 15-16 | 3.39/5 | 4.44/5 |
| Vol 17-18 | 3.26/5 | 4.08/5 |
| Vol 19-20 | 3.29/5 | 4.12/5 |
| Vol 21-22 | 3.24/5 | 4.23/5 |
| Vol 23-24 | 3.21/5 | 4.19/5 |
| Vol 25-26 | 2.94/5 | 4.11/5 |
| Vol 27-28 | 3.18/5 | 4.19/5 |
| Vol 29-30 | 3.10/5 | 4.14/5 |
| Vol 31-32 | 3.49/5 | 4.31/5 |
| Vol 33 | 3.42/5 | 4.27/5 |
| Overall | 3.14/5 | 4.44/5 |