| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-8 | 3.42/5 | 4.98/5 |
| Vol 9-16 | 3.15/5 | 4.88/5 |
| Vol 17-24 | 2.95/5 | 4.82/5 |
| Vol 25-32 | 3.04/5 | 4.89/5 |
| Vol 33-40 | 3.00/5 | 4.84/5 |
| Vol 41-48 | 2.95/5 | 4.89/5 |
| Vol 49-56 | 2.99/5 | 4.95/5 |
| Vol 57-64 | 2.99/5 | 4.89/5 |
| Vol 65-72 | 2.89/5 | 4.81/5 |
| Vol 73-80 | 2.80/5 | 4.88/5 |
| Vol 81-88 | 3.03/5 | 4.97/5 |
| Vol 89-96 | 2.69/5 | 4.69/5 |
| Vol 97-104 | 2.94/5 | 4.95/5 |
| Vol 105-112 | 2.60/5 | 4.87/5 |
| Vol 113-120 | 2.66/5 | 4.85/5 |
| Vol 121-128 | 3.66/5 | 4.99/5 |
| Vol 129-136 | 3.57/5 | 4.96/5 |
| Vol 137-144 | 3.30/5 | 4.93/5 |
| Vol 145-152 | 3.15/5 | 5.00/5 |
| Vol 153-160 | 3.11/5 | 4.77/5 |
| Vol 161-168 | 3.06/5 | 4.83/5 |
| Vol 169-176 | 3.03/5 | 4.85/5 |
| Vol 177-184 | 2.97/5 | 4.99/5 |
| Vol 185-192 | 2.89/5 | 4.81/5 |
| Vol 193-198 | 3.13/5 | 4.87/5 |
| Overall | 3.05/5 | 5.00/5 |