| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.68/5 | 4.50/5 |
| Vol 3-4 | 2.79/5 | 4.42/5 |
| Vol 5-6 | 2.74/5 | 4.29/5 |
| Vol 7-8 | 2.80/5 | 4.49/5 |
| Vol 9-10 | 2.70/5 | 4.40/5 |
| Vol 11-12 | 2.88/5 | 4.42/5 |
| Vol 13-14 | 2.99/5 | 4.55/5 |
| Vol 15-16 | 2.92/5 | 4.47/5 |
| Vol 17-18 | 3.01/5 | 4.50/5 |
| Vol 19-20 | 2.94/5 | 4.49/5 |
| Vol 21-22 | 2.87/5 | 4.46/5 |
| Vol 23-24 | 2.95/5 | 4.47/5 |
| Vol 25-26 | 2.93/5 | 4.55/5 |
| Vol 27-28 | 3.02/5 | 4.66/5 |
| Vol 29-30 | 3.07/5 | 4.67/5 |
| Vol 31-32 | 2.85/5 | 4.36/5 |
| Overall | 2.89/5 | 4.67/5 |