| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.13/5 | 4.66/5 |
| Vol 3-4 | 2.21/5 | 4.66/5 |
| Vol 5-6 | 2.29/5 | 4.76/5 |
| Vol 7-8 | 2.48/5 | 4.73/5 |
| Vol 9-10 | 2.59/5 | 4.77/5 |
| Vol 11-12 | 2.31/5 | 4.74/5 |
| Vol 13-14 | 2.83/5 | 4.89/5 |
| Vol 15-16 | 2.24/5 | 4.84/5 |
| Vol 17-18 | 2.39/5 | 4.76/5 |
| Vol 19-20 | 2.96/5 | 4.93/5 |
| Vol 21-22 | 2.52/5 | 4.84/5 |
| Vol 23-24 | 2.35/5 | 4.86/5 |
| Vol 25-26 | 2.24/5 | 4.75/5 |
| Vol 27-28 | 2.17/5 | 4.62/5 |
| Vol 29-30 | 2.31/5 | 4.58/5 |
| Vol 31-32 | 2.83/5 | 4.83/5 |
| Vol 33-34 | 2.73/5 | 4.87/5 |
| Vol 35-36 | 2.27/5 | 4.81/5 |
| Vol 37-38 | 2.02/5 | 4.73/5 |
| Vol 39-40 | 2.48/5 | 4.81/5 |
| Vol 41-42 | 2.65/5 | 4.83/5 |
| Vol 43-44 | 2.88/5 | 4.89/5 |
| Vol 45-46 | 2.79/5 | 4.86/5 |
| Vol 47-48 | 2.98/5 | 4.91/5 |
| Vol 49-50 | 2.53/5 | 4.80/5 |
| Overall | 2.47/5 | 4.93/5 |