| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.03/5 | 4.79/5 |
| Vol 3-4 | 2.84/5 | 4.63/5 |
| Vol 5-6 | 2.87/5 | 4.67/5 |
| Vol 7-8 | 3.10/5 | 4.70/5 |
| Vol 9-10 | 3.06/5 | 4.77/5 |
| Vol 11-12 | 3.25/5 | 4.77/5 |
| Vol 13-14 | 2.97/5 | 4.74/5 |
| Vol 15-16 | 3.11/5 | 4.75/5 |
| Vol 17-18 | 3.06/5 | 4.80/5 |
| Vol 19-20 | 3.04/5 | 4.75/5 |
| Vol 21-22 | 3.15/5 | 4.74/5 |
| Vol 23-24 | 3.26/5 | 4.83/5 |
| Vol 25-26 | 3.15/5 | 4.75/5 |
| Vol 27-28 | 3.25/5 | 4.80/5 |
| Vol 29-30 | 3.30/5 | 4.78/5 |
| Vol 31-32 | 3.15/5 | 4.83/5 |
| Vol 33-34 | 3.09/5 | 4.72/5 |
| Vol 35-36 | 3.04/5 | 4.77/5 |
| Overall | 3.10/5 | 4.83/5 |