| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.49/5 | 3.68/5 |
| Vol 3-4 | 2.49/5 | 3.54/5 |
| Vol 5-6 | 2.60/5 | 4.21/5 |
| Vol 7-8 | 2.41/5 | 3.75/5 |
| Vol 9-10 | 2.52/5 | 3.92/5 |
| Vol 11-12 | 2.63/5 | 4.30/5 |
| Vol 13-14 | 2.78/5 | 4.53/5 |
| Vol 15-16 | 2.67/5 | 4.53/5 |
| Vol 17-18 | 2.90/5 | 4.46/5 |
| Vol 19-20 | 2.64/5 | 4.33/5 |
| Vol 21-22 | 2.79/5 | 4.30/5 |
| Vol 23-24 | 2.75/5 | 4.50/5 |
| Vol 25-26 | 2.86/5 | 4.56/5 |
| Overall | 2.68/5 | 4.56/5 |