| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.44/5 | 4.25/5 |
| Vol 3-4 | 2.61/5 | 4.39/5 |
| Vol 5-6 | 2.81/5 | 4.61/5 |
| Vol 7-8 | 2.72/5 | 4.50/5 |
| Vol 9-10 | 2.71/5 | 4.39/5 |
| Vol 11-12 | 2.83/5 | 4.63/5 |
| Vol 13-14 | 2.69/5 | 4.57/5 |
| Vol 15-16 | 2.51/5 | 4.48/5 |
| Vol 17-18 | 2.67/5 | 4.60/5 |
| Vol 19-20 | 2.76/5 | 4.55/5 |
| Vol 21-22 | 2.87/5 | 4.71/5 |
| Vol 23-24 | 2.71/5 | 4.55/5 |
| Vol 25-26 | 2.84/5 | 4.60/5 |
| Vol 27-28 | 2.70/5 | 4.57/5 |
| Vol 29-30 | 2.71/5 | 4.46/5 |
| Vol 31-32 | 2.52/5 | 4.07/5 |
| Vol 33-34 | 2.63/5 | 4.37/5 |
| Vol 35 | 3.06/5 | 4.63/5 |
| Overall | 2.70/5 | 4.71/5 |