| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.32/5 | 4.29/5 |
| Vol 3-4 | 2.20/5 | 3.60/5 |
| Vol 5-6 | 2.57/5 | 3.95/5 |
| Vol 7-8 | 2.67/5 | 4.20/5 |
| Vol 9-10 | 2.49/5 | 3.80/5 |
| Vol 11-12 | 2.47/5 | 3.97/5 |
| Vol 13-14 | 2.56/5 | 4.12/5 |
| Vol 15-16 | 2.35/5 | 3.86/5 |
| Vol 17-18 | 2.43/5 | 3.80/5 |
| Vol 19-20 | 2.56/5 | 4.02/5 |
| Vol 21-22 | 2.97/5 | 4.42/5 |
| Vol 23-24 | 2.63/5 | 4.53/5 |
| Vol 25-26 | 2.55/5 | 4.18/5 |
| Vol 27-28 | 2.65/5 | 4.20/5 |
| Vol 29-30 | 2.53/5 | 3.85/5 |
| Vol 31-32 | 2.40/5 | 4.20/5 |
| Vol 33-34 | 2.69/5 | 4.40/5 |
| Vol 35 | 3.00/5 | 4.31/5 |
| Overall | 2.54/5 | 4.53/5 |