| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.50/5 | 4.56/5 |
| Vol 3-4 | 2.39/5 | 4.20/5 |
| Vol 5-6 | 2.24/5 | 3.35/5 |
| Vol 7-8 | 2.14/5 | 3.33/5 |
| Vol 9-10 | 2.41/5 | 3.55/5 |
| Vol 11-12 | 2.43/5 | 4.09/5 |
| Vol 13-14 | 2.38/5 | 4.45/5 |
| Vol 15-16 | 2.48/5 | 3.92/5 |
| Vol 17-18 | 2.37/5 | 4.56/5 |
| Vol 19-20 | 2.59/5 | 4.51/5 |
| Vol 21-22 | 2.62/5 | 4.20/5 |
| Vol 23-24 | 2.36/5 | 4.42/5 |
| Vol 25-26 | 2.57/5 | 4.65/5 |
| Vol 27-28 | 2.81/5 | 4.65/5 |
| Overall | 2.47/5 | 4.65/5 |