| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.60/5 | 4.38/5 |
| Vol 3-4 | 2.70/5 | 4.46/5 |
| Vol 5-6 | 2.84/5 | 4.55/5 |
| Vol 7-8 | 2.86/5 | 4.48/5 |
| Vol 9-10 | 2.68/5 | 4.54/5 |
| Vol 11-12 | 2.80/5 | 4.55/5 |
| Vol 13-14 | 3.22/5 | 4.55/5 |
| Vol 15-16 | 2.89/5 | 4.55/5 |
| Vol 17-18 | 2.67/5 | 4.48/5 |
| Vol 19-20 | 3.46/5 | 4.59/5 |
| Vol 21-22 | 2.98/5 | 4.56/5 |
| Vol 23-24 | 3.28/5 | 4.58/5 |
| Vol 25-26 | 2.88/5 | 4.52/5 |
| Vol 27-28 | 2.72/5 | 4.49/5 |
| Vol 29-30 | 3.78/5 | 4.64/5 |
| Vol 31-32 | 4.04/5 | 4.63/5 |
| Vol 33-34 | 3.04/5 | 4.56/5 |
| Vol 35-36 | 2.93/5 | 4.54/5 |
| Vol 37 | 3.27/5 | 4.53/5 |
| Overall | 3.03/5 | 4.64/5 |