| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.09/5 | 4.53/5 |
| Vol 3-4 | 3.12/5 | 4.49/5 |
| Vol 5-6 | 3.38/5 | 4.57/5 |
| Vol 7-8 | 3.18/5 | 4.54/5 |
| Vol 9-10 | 2.93/5 | 4.56/5 |
| Vol 11-12 | 4.04/5 | 4.62/5 |
| Vol 13-14 | 3.41/5 | 4.59/5 |
| Vol 15-16 | 3.33/5 | 4.52/5 |
| Vol 17-18 | 3.93/5 | 4.66/5 |
| Vol 19-20 | 3.77/5 | 4.59/5 |
| Vol 21-22 | 4.04/5 | 4.63/5 |
| Vol 23-24 | 3.93/5 | 4.59/5 |
| Vol 25-26 | 4.11/5 | 4.64/5 |
| Vol 27-28 | 3.67/5 | 4.67/5 |
| Vol 29-30 | 3.59/5 | 4.57/5 |
| Vol 31-32 | 3.48/5 | 4.55/5 |
| Vol 33-34 | 3.70/5 | 4.60/5 |
| Vol 35-36 | 3.59/5 | 4.59/5 |
| Vol 37-38 | 3.25/5 | 4.58/5 |
| Overall | 3.55/5 | 4.67/5 |