| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.88/5 | 4.52/5 |
| Vol 3-4 | 3.29/5 | 4.56/5 |
| Vol 5-6 | 3.48/5 | 4.58/5 |
| Vol 7-8 | 2.95/5 | 4.47/5 |
| Vol 9-10 | 2.60/5 | 4.40/5 |
| Vol 11-12 | 2.84/5 | 4.53/5 |
| Vol 13-14 | 3.18/5 | 4.52/5 |
| Vol 15-16 | 2.88/5 | 4.43/5 |
| Vol 17-18 | 3.18/5 | 4.54/5 |
| Vol 19-20 | 2.72/5 | 4.42/5 |
| Vol 21-22 | 3.19/5 | 4.52/5 |
| Vol 23-24 | 2.79/5 | 4.44/5 |
| Vol 25-26 | 3.20/5 | 4.45/5 |
| Vol 27-28 | 2.93/5 | 4.43/5 |
| Vol 29-30 | 3.30/5 | 4.52/5 |
| Vol 31-32 | 2.91/5 | 4.41/5 |
| Vol 33-34 | 2.54/5 | 4.37/5 |
| Overall | 2.99/5 | 4.58/5 |