| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.52/5 | 4.60/5 |
| Vol 3-4 | 3.18/5 | 4.60/5 |
| Vol 5-6 | 3.41/5 | 4.64/5 |
| Vol 7-8 | 3.44/5 | 4.59/5 |
| Vol 9-10 | 3.56/5 | 4.63/5 |
| Vol 11-12 | 3.57/5 | 4.61/5 |
| Vol 13-14 | 3.56/5 | 4.63/5 |
| Vol 15-16 | 3.13/5 | 4.54/5 |
| Vol 17-18 | 3.72/5 | 4.64/5 |
| Vol 19-20 | 3.67/5 | 4.63/5 |
| Vol 21-22 | 3.66/5 | 4.70/5 |
| Vol 23-24 | 3.90/5 | 4.79/5 |
| Vol 25-26 | 3.84/5 | 4.70/5 |
| Vol 27 | 3.42/5 | 4.58/5 |
| Overall | 3.52/5 | 4.79/5 |