| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.24/5 | 4.46/5 |
| Vol 3-4 | 2.68/5 | 4.51/5 |
| Vol 5-6 | 2.78/5 | 4.55/5 |
| Vol 7-8 | 3.00/5 | 4.58/5 |
| Vol 9-10 | 2.47/5 | 4.48/5 |
| Vol 11-12 | 2.62/5 | 4.46/5 |
| Vol 13-14 | 2.65/5 | 4.52/5 |
| Vol 15-16 | 3.06/5 | 4.58/5 |
| Vol 17-18 | 3.76/5 | 4.61/5 |
| Vol 19-20 | 3.40/5 | 4.60/5 |
| Vol 21-22 | 3.44/5 | 4.67/5 |
| Vol 23-24 | 2.87/5 | 4.54/5 |
| Vol 25-26 | 2.52/5 | 4.52/5 |
| Vol 27-28 | 2.86/5 | 4.54/5 |
| Vol 29-30 | 3.52/5 | 4.63/5 |
| Vol 31-32 | 4.06/5 | 4.63/5 |
| Vol 33-34 | 3.08/5 | 4.58/5 |
| Vol 35-36 | 3.59/5 | 4.63/5 |
| Vol 37-38 | 3.77/5 | 4.62/5 |
| Vol 39-40 | 3.42/5 | 4.62/5 |
| Vol 41-42 | 3.45/5 | 4.63/5 |
| Vol 43-44 | 3.48/5 | 4.58/5 |
| Vol 45 | 3.75/5 | 4.59/5 |
| Overall | 3.14/5 | 4.67/5 |