| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.80/5 | 4.82/5 |
| Vol 3-4 | 2.65/5 | 4.71/5 |
| Vol 5-6 | 2.58/5 | 4.83/5 |
| Vol 7-8 | 2.80/5 | 4.90/5 |
| Vol 9-10 | 2.46/5 | 4.83/5 |
| Vol 11-12 | 2.87/5 | 4.86/5 |
| Vol 13-14 | 2.79/5 | 4.89/5 |
| Vol 15-16 | 2.69/5 | 4.85/5 |
| Vol 17-18 | 2.69/5 | 4.91/5 |
| Vol 19-20 | 2.37/5 | 4.81/5 |
| Vol 21-22 | 2.65/5 | 4.83/5 |
| Vol 23-24 | 2.89/5 | 4.86/5 |
| Vol 25-26 | 2.87/5 | 4.85/5 |
| Vol 27-28 | 2.82/5 | 4.82/5 |
| Vol 29-30 | 3.11/5 | 4.94/5 |
| Vol 31-32 | 2.71/5 | 4.87/5 |
| Vol 33-34 | 2.30/5 | 4.81/5 |
| Vol 35-36 | 2.46/5 | 4.79/5 |
| Vol 37-38 | 2.71/5 | 4.88/5 |
| Vol 39-40 | 2.56/5 | 4.82/5 |
| Vol 41-42 | 2.18/5 | 4.62/5 |
| Vol 43-44 | 2.54/5 | 4.75/5 |
| Vol 45 | 2.94/5 | 4.83/5 |
| Overall | 2.66/5 | 4.94/5 |