| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.96/5 | 4.07/5 |
| Vol 3-4 | 2.81/5 | 3.94/5 |
| Vol 5-6 | 2.86/5 | 3.82/5 |
| Vol 7-8 | 2.98/5 | 4.08/5 |
| Vol 9-10 | 3.00/5 | 4.01/5 |
| Vol 11-12 | 2.94/5 | 3.94/5 |
| Vol 13-14 | 3.00/5 | 4.09/5 |
| Vol 15-16 | 2.78/5 | 3.99/5 |
| Vol 17-18 | 2.96/5 | 3.94/5 |
| Vol 19-20 | 2.93/5 | 3.90/5 |
| Vol 21-22 | 2.88/5 | 3.90/5 |
| Vol 23-24 | 2.98/5 | 3.89/5 |
| Vol 25-26 | 2.69/5 | 3.87/5 |
| Vol 27-28 | 2.66/5 | 3.84/5 |
| Vol 29-30 | 2.85/5 | 3.95/5 |
| Vol 31-32 | 2.61/5 | 3.90/5 |
| Vol 33-34 | 3.03/5 | 4.12/5 |
| Vol 35-36 | 2.42/5 | 3.76/5 |
| Overall | 2.85/5 | 4.12/5 |