| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.73/5 | 4.46/5 |
| Vol 3-4 | 2.87/5 | 4.51/5 |
| Vol 5-6 | 2.79/5 | 4.49/5 |
| Vol 7-8 | 2.76/5 | 4.46/5 |
| Vol 9-10 | 2.69/5 | 4.45/5 |
| Vol 11-12 | 2.87/5 | 4.45/5 |
| Vol 13-14 | 2.73/5 | 4.43/5 |
| Vol 15-16 | 2.78/5 | 4.41/5 |
| Vol 17-18 | 2.84/5 | 4.42/5 |
| Vol 19-20 | 2.86/5 | 4.45/5 |
| Vol 21-22 | 2.70/5 | 4.46/5 |
| Vol 23-24 | 2.72/5 | 4.45/5 |
| Vol 25-26 | 2.78/5 | 4.50/5 |
| Vol 27-28 | 2.63/5 | 4.38/5 |
| Vol 29-30 | 2.68/5 | 4.42/5 |
| Vol 31-32 | 2.76/5 | 4.48/5 |
| Vol 33 | 2.46/5 | 4.12/5 |
| Overall | 2.75/5 | 4.51/5 |