| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.46/5 | 4.53/5 |
| Vol 3-4 | 1.98/5 | 4.48/5 |
| Vol 5-6 | 2.16/5 | 4.52/5 |
| Vol 7-8 | 2.70/5 | 4.63/5 |
| Vol 9-10 | 3.00/5 | 4.65/5 |
| Vol 11-12 | 4.17/5 | 4.76/5 |
| Vol 13-14 | 3.58/5 | 4.75/5 |
| Vol 15-16 | 2.37/5 | 4.60/5 |
| Vol 17-18 | 2.86/5 | 4.63/5 |
| Vol 19-20 | 3.39/5 | 4.70/5 |
| Vol 21-22 | 3.41/5 | 4.68/5 |
| Vol 23-24 | 2.65/5 | 4.62/5 |
| Vol 25-26 | 3.02/5 | 4.67/5 |
| Vol 27-28 | 3.80/5 | 4.71/5 |
| Vol 29-30 | 4.10/5 | 4.69/5 |
| Vol 31-32 | 3.55/5 | 4.70/5 |
| Vol 33-34 | 3.56/5 | 4.70/5 |
| Vol 35-36 | 4.09/5 | 4.69/5 |
| Vol 37-38 | 3.74/5 | 4.68/5 |
| Vol 39-40 | 3.53/5 | 4.71/5 |
| Vol 41-42 | 3.13/5 | 4.64/5 |
| Vol 43-44 | 3.57/5 | 4.70/5 |
| Vol 45-46 | 2.92/5 | 4.63/5 |
| Overall | 3.19/5 | 4.76/5 |