| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.32/5 | 4.09/5 |
| Vol 3-4 | 2.50/5 | 4.27/5 |
| Vol 5-6 | 2.50/5 | 4.32/5 |
| Vol 7-8 | 2.67/5 | 4.43/5 |
| Vol 9-10 | 3.02/5 | 4.45/5 |
| Vol 11-12 | 2.84/5 | 4.41/5 |
| Vol 13-14 | 2.81/5 | 4.45/5 |
| Vol 15-16 | 2.87/5 | 4.42/5 |
| Vol 17-18 | 2.77/5 | 4.46/5 |
| Vol 19-20 | 2.76/5 | 4.38/5 |
| Vol 21-22 | 2.84/5 | 4.44/5 |
| Vol 23-24 | 2.69/5 | 4.39/5 |
| Vol 25-26 | 2.52/5 | 4.38/5 |
| Vol 27-28 | 2.48/5 | 4.21/5 |
| Vol 29-30 | 2.52/5 | 4.32/5 |
| Vol 31-32 | 2.48/5 | 4.30/5 |
| Vol 33-34 | 2.78/5 | 4.44/5 |
| Vol 35-36 | 3.08/5 | 4.45/5 |
| Vol 37-38 | 2.70/5 | 4.40/5 |
| Vol 39-40 | 2.82/5 | 4.45/5 |
| Vol 41-42 | 2.98/5 | 4.46/5 |
| Vol 43-44 | 2.78/5 | 4.36/5 |
| Vol 45-46 | 2.78/5 | 4.41/5 |
| Vol 47-48 | 2.76/5 | 4.44/5 |
| Overall | 2.72/5 | 4.46/5 |