| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 4.07/5 | 4.60/5 |
| Vol 3-4 | 3.95/5 | 4.54/5 |
| Vol 5-6 | 3.61/5 | 4.53/5 |
| Vol 7-8 | 4.11/5 | 4.60/5 |
| Vol 9-10 | 3.89/5 | 4.55/5 |
| Vol 11-12 | 4.04/5 | 4.57/5 |
| Vol 13-14 | 4.03/5 | 4.56/5 |
| Vol 15-16 | 3.76/5 | 4.55/5 |
| Vol 17-18 | 3.50/5 | 4.50/5 |
| Vol 19-20 | 3.83/5 | 4.50/5 |
| Vol 21-22 | 3.53/5 | 4.52/5 |
| Vol 23-24 | 3.72/5 | 4.53/5 |
| Vol 25-26 | 3.91/5 | 4.51/5 |
| Vol 27-28 | 3.76/5 | 4.58/5 |
| Vol 29-30 | 4.08/5 | 4.61/5 |
| Vol 31-32 | 3.95/5 | 4.53/5 |
| Vol 33-34 | 4.04/5 | 4.57/5 |
| Vol 35-36 | 3.87/5 | 4.51/5 |
| Vol 37-38 | 4.03/5 | 4.56/5 |
| Vol 39-40 | 3.52/5 | 4.53/5 |
| Vol 41 | 4.12/5 | 4.59/5 |
| Overall | 3.85/5 | 4.61/5 |