| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.44/5 | 4.49/5 |
| Vol 3-4 | 2.78/5 | 4.50/5 |
| Vol 5-6 | 2.84/5 | 4.57/5 |
| Vol 7-8 | 2.78/5 | 4.44/5 |
| Vol 9-10 | 3.04/5 | 4.55/5 |
| Vol 11-12 | 3.03/5 | 4.55/5 |
| Vol 13-14 | 2.99/5 | 4.57/5 |
| Vol 15-16 | 3.38/5 | 4.57/5 |
| Vol 17-18 | 3.40/5 | 4.63/5 |
| Vol 19-20 | 3.19/5 | 4.55/5 |
| Vol 21-22 | 3.84/5 | 4.61/5 |
| Vol 23-24 | 3.92/5 | 4.63/5 |
| Vol 25-26 | 4.00/5 | 4.63/5 |
| Vol 27 | 3.76/5 | 4.57/5 |
| Overall | 3.22/5 | 4.63/5 |