| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.66/5 | 4.44/5 |
| Vol 3-4 | 2.76/5 | 4.49/5 |
| Vol 5-6 | 2.92/5 | 4.51/5 |
| Vol 7-8 | 3.24/5 | 4.59/5 |
| Vol 9-10 | 2.96/5 | 4.55/5 |
| Vol 11-12 | 2.58/5 | 4.47/5 |
| Vol 13-14 | 2.76/5 | 4.53/5 |
| Vol 15-16 | 2.40/5 | 4.44/5 |
| Vol 17-18 | 2.72/5 | 4.55/5 |
| Vol 19-20 | 3.80/5 | 4.60/5 |
| Vol 21-22 | 2.90/5 | 4.55/5 |
| Vol 23-24 | 2.86/5 | 4.52/5 |
| Vol 25-26 | 2.77/5 | 4.51/5 |
| Vol 27-28 | 3.10/5 | 4.58/5 |
| Vol 29-30 | 2.86/5 | 4.56/5 |
| Vol 31-32 | 3.36/5 | 4.65/5 |
| Vol 33-34 | 3.18/5 | 4.53/5 |
| Vol 35-36 | 2.72/5 | 4.55/5 |
| Vol 37-38 | 3.10/5 | 4.55/5 |
| Vol 39-40 | 2.68/5 | 4.47/5 |
| Vol 41-42 | 2.96/5 | 4.47/5 |
| Vol 43-44 | 3.00/5 | 4.55/5 |
| Vol 45-46 | 3.10/5 | 4.55/5 |
| Vol 47-48 | 2.78/5 | 4.47/5 |
| Overall | 2.92/5 | 4.65/5 |