| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.77/5 | 3.88/5 |
| Vol 3-4 | 2.62/5 | 3.75/5 |
| Vol 5-6 | 2.67/5 | 3.63/5 |
| Vol 7-8 | 2.79/5 | 3.89/5 |
| Vol 9-10 | 2.81/5 | 3.82/5 |
| Vol 11-12 | 2.76/5 | 3.75/5 |
| Vol 13-14 | 2.82/5 | 3.90/5 |
| Vol 15-16 | 2.59/5 | 3.80/5 |
| Vol 17-18 | 2.77/5 | 3.75/5 |
| Vol 19-20 | 2.74/5 | 3.71/5 |
| Vol 21-22 | 2.69/5 | 3.71/5 |
| Vol 23-24 | 2.79/5 | 3.70/5 |
| Vol 25-26 | 2.50/5 | 3.68/5 |
| Vol 27-28 | 2.46/5 | 3.65/5 |
| Vol 29-30 | 2.66/5 | 3.76/5 |
| Vol 31-32 | 2.42/5 | 3.71/5 |
| Vol 33-34 | 2.84/5 | 3.93/5 |
| Vol 35-36 | 2.23/5 | 3.57/5 |
| Overall | 2.66/5 | 3.93/5 |