| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.59/5 | 3.77/5 |
| Vol 3-4 | 2.89/5 | 3.93/5 |
| Vol 5-6 | 2.79/5 | 3.85/5 |
| Vol 7-8 | 3.03/5 | 4.16/5 |
| Vol 9-10 | 2.91/5 | 4.03/5 |
| Vol 11-12 | 2.99/5 | 4.12/5 |
| Vol 13-14 | 2.94/5 | 3.94/5 |
| Vol 15-16 | 2.99/5 | 4.04/5 |
| Vol 17-18 | 3.07/5 | 3.91/5 |
| Vol 19-20 | 2.99/5 | 4.01/5 |
| Vol 21-22 | 2.78/5 | 3.82/5 |
| Vol 23-24 | 3.20/5 | 4.08/5 |
| Vol 25-26 | 2.99/5 | 4.06/5 |
| Vol 27-28 | 3.29/5 | 4.12/5 |
| Vol 29-30 | 2.90/5 | 4.08/5 |
| Vol 31-32 | 2.98/5 | 3.86/5 |
| Vol 33-34 | 3.01/5 | 4.00/5 |
| Vol 35-36 | 3.08/5 | 3.96/5 |
| Vol 37-38 | 3.19/5 | 4.13/5 |
| Vol 39-40 | 2.96/5 | 3.97/5 |
| Vol 41-42 | 2.95/5 | 3.83/5 |
| Vol 43-44 | 3.24/5 | 4.11/5 |
| Vol 45-46 | 3.04/5 | 3.98/5 |
| Overall | 3.00/5 | 4.16/5 |