| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.81/5 | 4.39/5 |
| Vol 3-4 | 3.22/5 | 4.55/5 |
| Vol 5-6 | 2.89/5 | 4.49/5 |
| Vol 7-8 | 2.92/5 | 4.48/5 |
| Vol 9-10 | 2.66/5 | 4.47/5 |
| Vol 11-12 | 2.76/5 | 4.46/5 |
| Vol 13-14 | 3.28/5 | 4.63/5 |
| Vol 15-16 | 3.09/5 | 4.58/5 |
| Vol 17-18 | 3.07/5 | 4.47/5 |
| Vol 19-20 | 2.85/5 | 4.46/5 |
| Vol 21-22 | 2.76/5 | 4.42/5 |
| Vol 23-24 | 3.15/5 | 4.64/5 |
| Vol 25-26 | 3.18/5 | 4.60/5 |
| Vol 27-28 | 3.14/5 | 4.57/5 |
| Vol 29-30 | 3.08/5 | 4.58/5 |
| Vol 31-32 | 3.21/5 | 4.51/5 |
| Vol 33-34 | 2.80/5 | 4.43/5 |
| Vol 35-36 | 2.82/5 | 4.46/5 |
| Vol 37-38 | 3.90/5 | 4.69/5 |
| Overall | 3.02/5 | 4.69/5 |