| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.62/5 | 4.30/5 |
| Vol 3-4 | 2.87/5 | 4.52/5 |
| Vol 5-6 | 2.72/5 | 4.48/5 |
| Vol 7-8 | 2.78/5 | 4.51/5 |
| Vol 9-10 | 2.80/5 | 4.52/5 |
| Vol 11-12 | 2.60/5 | 4.48/5 |
| Vol 13-14 | 2.74/5 | 4.46/5 |
| Vol 15-16 | 2.94/5 | 4.55/5 |
| Vol 17-18 | 3.06/5 | 4.54/5 |
| Vol 19-20 | 2.78/5 | 4.50/5 |
| Vol 21-22 | 2.80/5 | 4.51/5 |
| Vol 23-24 | 3.02/5 | 4.57/5 |
| Vol 25-26 | 2.81/5 | 4.47/5 |
| Vol 27-28 | 2.76/5 | 4.46/5 |
| Vol 29-30 | 2.93/5 | 4.54/5 |
| Overall | 2.82/5 | 4.57/5 |